Revert "brk(): larger allocation units internally"

This reverts commit c58ab0f648.
use MCS locks in physical memory allocator
2016-12-20 11:11:09 +09:00 · 2016-12-19 12:57:59 +09:00 · 2016-12-19 12:55:12 +09:00 · 2016-12-18 21:12:38 +09:00 · 2016-12-18 21:12:38 +09:00 · 2016-12-18 21:12:37 +09:00
39 changed files with 2242 additions and 352 deletions
--- a/arch/x86/kernel/cpu.c
+++ b/arch/x86/kernel/cpu.c
@ -844,6 +844,25 @@ void set_signal(int sig, void *regs, struct siginfo *info);
 void check_signal(unsigned long, void *, int);
 extern void tlb_flush_handler(int vector);

+void __show_stack(uintptr_t *sp) {
+	while (((uintptr_t)sp >= 0xffff800000000000)
+			&& ((uintptr_t)sp <  0xffffffff80000000)) {
+		uintptr_t fp;
+		uintptr_t ip;
+
+		fp = sp[0];
+		ip = sp[1];
+		kprintf("IP: %016lx, SP: %016lx, FP: %016lx\n", ip, (uintptr_t)sp, fp);
+		sp = (void *)fp;
+	}
+	return;
+}
+
+void show_context_stack(uintptr_t *rbp) {
+	__show_stack(rbp);
+	return;
+}
+
 void handle_interrupt(int vector, struct x86_user_context *regs)
 {
 	struct ihk_mc_interrupt_handler *h;
@ -952,6 +971,9 @@ void handle_interrupt(int vector, struct x86_user_context *regs)

 			tlb_flush_handler(vector);
 	} 
+	else if (vector == 133) {
+		show_context_stack((uintptr_t *)regs->gpr.rbp);
+	}
 	else {
 		list_for_each_entry(h, &handlers[vector - 32], list) {
 			if (h->func) {
--- a/arch/x86/kernel/include/arch-lock.h
+++ b/arch/x86/kernel/include/arch-lock.h
@ -131,6 +131,7 @@ static void __ihk_mc_spinlock_unlock(ihk_spinlock_t *lock, unsigned long flags)
 typedef struct mcs_lock_node {
 	unsigned long locked;
 	struct mcs_lock_node *next;
+	unsigned long irqsave;
 } __attribute__((aligned(64))) mcs_lock_node_t;

 static void mcs_lock_init(struct mcs_lock_node *node)
@ -139,7 +140,7 @@ static void mcs_lock_init(struct mcs_lock_node *node)
 	node->next = NULL;
 }

-static void mcs_lock_lock(struct mcs_lock_node *lock,
+static void __mcs_lock_lock(struct mcs_lock_node *lock,
 		struct mcs_lock_node *node)
 {
 	struct mcs_lock_node *pred;
@ -158,7 +159,7 @@ static void mcs_lock_lock(struct mcs_lock_node *lock,
 	}
 }

-static void mcs_lock_unlock(struct mcs_lock_node *lock,
+static void __mcs_lock_unlock(struct mcs_lock_node *lock,
 		struct mcs_lock_node *node)
 {
 	if (node->next == NULL) {
@ -178,6 +179,35 @@ static void mcs_lock_unlock(struct mcs_lock_node *lock,
 	node->next->locked = 0;
 }

+static void mcs_lock_lock_noirq(struct mcs_lock_node *lock,
+		struct mcs_lock_node *node)
+{
+	preempt_disable();
+	__mcs_lock_lock(lock, node);
+}
+
+static void mcs_lock_unlock_noirq(struct mcs_lock_node *lock,
+		struct mcs_lock_node *node)
+{
+	__mcs_lock_unlock(lock, node);
+	preempt_enable();
+}
+
+static void mcs_lock_lock(struct mcs_lock_node *lock,
+		struct mcs_lock_node *node)
+{
+	node->irqsave = cpu_disable_interrupt_save();
+	mcs_lock_lock_noirq(lock, node);
+}
+
+static void mcs_lock_unlock(struct mcs_lock_node *lock,
+		struct mcs_lock_node *node)
+{
+	mcs_lock_unlock_noirq(lock, node);
+	cpu_restore_interrupt(node->irqsave);
+}
+
+
 // reader/writer lock
 typedef struct mcs_rwlock_node {
 	ihk_atomic_t count;	// num of readers (use only common reader)
--- a/arch/x86/kernel/include/syscall_list.h
+++ b/arch/x86/kernel/include/syscall_list.h
@ -22,7 +22,7 @@

 SYSCALL_HANDLED(0, read)
 SYSCALL_DELEGATED(1, write)
-SYSCALL_DELEGATED(2, open)
+SYSCALL_HANDLED(2, open)
 SYSCALL_HANDLED(3, close)
 SYSCALL_DELEGATED(4, stat)
 SYSCALL_DELEGATED(5, fstat)
--- a/arch/x86/kernel/memory.c
+++ b/arch/x86/kernel/memory.c
@ -558,28 +558,34 @@ int ihk_mc_pt_print_pte(struct page_table *pt, void *virt)

 	GET_VIRT_INDICES(v, l4idx, l3idx, l2idx, l1idx);

+	__kprintf("l4 table: 0x%lX l4idx: %d \n", virt_to_phys(pt), l4idx);
 	if (!(pt->entry[l4idx] & PFL4_PRESENT)) {
 		__kprintf("0x%lX l4idx not present! \n", (unsigned long)virt);
-		__kprintf("l4 entry: 0x%lX\n", pt->entry[l4idx]);
 		return -EFAULT;
 	}
+	__kprintf("l4 entry: 0x%lX\n", pt->entry[l4idx]);
 	pt = phys_to_virt(pt->entry[l4idx] & PAGE_MASK);

 	__kprintf("l3 table: 0x%lX l3idx: %d \n", virt_to_phys(pt), l3idx);
 	if (!(pt->entry[l3idx] & PFL3_PRESENT)) {
 		__kprintf("0x%lX l3idx not present! \n", (unsigned long)virt);
-		__kprintf("l3 entry: 0x%lX\n", pt->entry[l3idx]);
 		return -EFAULT;
 	}
+	__kprintf("l3 entry: 0x%lX\n", pt->entry[l3idx]);
+	if ((pt->entry[l3idx] & PFL3_SIZE)) {
+		__kprintf("l3 entry is 1G page\n");
+		return 0;
+	}
 	pt = phys_to_virt(pt->entry[l3idx] & PAGE_MASK);
 	
 	__kprintf("l2 table: 0x%lX l2idx: %d \n", virt_to_phys(pt), l2idx);
 	if (!(pt->entry[l2idx] & PFL2_PRESENT)) {
 		__kprintf("0x%lX l2idx not present! \n", (unsigned long)virt);
-		__kprintf("l2 entry: 0x%lX\n", pt->entry[l2idx]);
 		return -EFAULT;
 	}
+	__kprintf("l2 entry: 0x%lX\n", pt->entry[l2idx]);
 	if ((pt->entry[l2idx] & PFL2_SIZE)) {
+		__kprintf("l2 entry is 2M page\n");
 		return 0;
 	}
 	pt = phys_to_virt(pt->entry[l2idx] & PAGE_MASK);
@ -1773,9 +1779,19 @@ int ihk_mc_pt_set_pte(page_table_t pt, pte_t *ptep, size_t pgsize,
 		*ptep = phys | attr_to_l1attr(attr);
 	}
 	else if (pgsize == PTL2_SIZE) {
+		if (phys & (PTL2_SIZE - 1)) {
+			kprintf("%s: error: phys needs to be PTL2_SIZE aligned\n", __FUNCTION__);
+			error = -1;
+			goto out;
+		}
 		*ptep = phys | attr_to_l2attr(attr | PTATTR_LARGEPAGE);
 	}
 	else if ((pgsize == PTL3_SIZE) && (use_1gb_page)) {
+		if (phys & (PTL3_SIZE - 1)) {
+			kprintf("%s: error: phys needs to be PTL3_SIZE aligned\n", __FUNCTION__);
+			error = -1;
+			goto out;
+		}
 		*ptep = phys | attr_to_l3attr(attr | PTATTR_LARGEPAGE);
 	}
 	else {
--- a/arch/x86/kernel/syscall.c
+++ b/arch/x86/kernel/syscall.c
@ -70,71 +70,37 @@ static struct vdso vdso;
 static size_t container_size = 0;
 static ptrdiff_t vdso_offset;

-/*
-See dkprintf("BSP HW ID = %d, ", bsp_hw_id); (in ./mcos/kernel/ap.c)
+extern int num_processors;

-Core with BSP HW ID 224 is 1st logical core of last physical core.
-It                      boots first and is given SW-ID of 0
+int obtain_clone_cpuid(cpu_set_t *cpu_set) {
+	int min_queue_len = -1;
+	int cpu, min_cpu = -1;

-Core with BSP HW ID 0 is 1st logical core of 1st physical core. 
-It                      boots next and is given  SW-ID of 1.
-Core with BSP HW ID 1   boots next and is given  SW-ID of 2.
-Core with BSP HW ID 2   boots next and is given  SW-ID of 3.
-Core with BSP HW ID 3   boots next and is given  SW-ID of 4.
-...
-Core with BSP HW ID 220 is 1st logical core of 56-th physical core.
-It                      boots next and is given  SW-ID of 221.
-Core with BSP HW ID 221 boots next and is given  SW-ID of 222.
-Core with BSP HW ID 222 boots next and is given  SW-ID of 223.
-Core with BSP HW ID 223 boots next and is given  SW-ID of 224.
+	/* Find the first allowed core with the shortest run queue */
+	for (cpu = 0; cpu < num_processors; ++cpu) {
+		struct cpu_local_var *v;
+		unsigned long irqstate;

-Core with BSP HW ID 225 is 2nd logical core of last physical core.
-It                      boots next and is given  SW-ID of 225.
-Core with BSP HW ID 226 boots next and is given  SW-ID of 226.
-Core with BSP HW ID 227 boots next and is given  SW-ID of 227.
-*/
-ihk_spinlock_t cpuid_head_lock = 0;
-static int cpuid_head = 0;
+		if (!CPU_ISSET(cpu, cpu_set)) continue;

-/* archtecture-depended syscall handlers */
-int obtain_clone_cpuid() {
-    /* see above on BSP HW ID */
-	struct ihk_mc_cpu_info *cpu_info = ihk_mc_get_cpu_info();
-    int cpuid, nretry = 0;
-    ihk_mc_spinlock_lock_noirq(&cpuid_head_lock);
-	
-	/* Always start from 0 to fill in LWK cores linearily */
-	cpuid_head = 0;
- retry:
-    /* Try to obtain next physical core */
-    cpuid = cpuid_head;
+		v = get_cpu_local_var(cpu);
+		irqstate = ihk_mc_spinlock_lock(&v->runq_lock);
+		if (min_queue_len == -1 || v->runq_len < min_queue_len) {
+			min_queue_len = v->runq_len;
+			min_cpu = cpu;
+		}
+		ihk_mc_spinlock_unlock(&v->runq_lock, irqstate);

-    /* A hyper-threading core on the same physical core as
-       the parent process might be chosen. Use sched_setaffinity
-       if you want to skip that kind of busy physical core for
-       performance reason. */
-    cpuid_head += 1;
-    if(cpuid_head >= cpu_info->ncpus) {
-        cpuid_head = 0;
-    }
+		if (min_queue_len == 0)
+			break;
+	}

-    /* A hyper-threading core whose parent physical core has a
-       process on one of its hyper-threading core might
-       be chosen. Use sched_setaffinity if you want to skip that
-       kind of busy physical core for performance reason. */
-    if(get_cpu_local_var(cpuid)->status != CPU_STATUS_IDLE) {
-        nretry++;
-        if(nretry >= cpu_info->ncpus) {
-            cpuid = -1;
-            ihk_mc_spinlock_unlock_noirq(&cpuid_head_lock);
-            goto out;
-        }
-        goto retry; 
-    }
-	get_cpu_local_var(cpuid)->status = CPU_STATUS_RESERVED;
-    ihk_mc_spinlock_unlock_noirq(&cpuid_head_lock);
- out:
-    return cpuid;
+	if (min_cpu != -1) {
+		if (get_cpu_local_var(min_cpu)->status != CPU_STATUS_RESERVED)
+			get_cpu_local_var(min_cpu)->status = CPU_STATUS_RESERVED;
+	}
+
+    return min_cpu;
 }

 int
--- a/arch/x86/tools/mcreboot-smp-x86.sh.in
+++ b/arch/x86/tools/mcreboot-smp-x86.sh.in
@ -404,6 +404,8 @@ if [ "$enable_mcoverlay" == "yes" ]; then
 	# TODO: How de we revert this in case of failure??
 	mount --make-rprivate /sys

+	touch /tmp/mcos/mcos0_proc/mckernel
+
 	rm -rf /tmp/mcos/mcos0_sys/setup_complete

 	# Hide NUMA related files which are outside the LWK partition
--- a/executer/include/uprotocol.h
+++ b/executer/include/uprotocol.h
@ -42,6 +42,7 @@
 #define MCEXEC_UP_GET_CRED	 0x30a0290a
 #define MCEXEC_UP_GET_CREDV	 0x30a0290b
 #define MCEXEC_UP_GET_NODES  0x30a0290c
+#define MCEXEC_UP_GET_CPUSET  0x30a0290d

 #define MCEXEC_UP_PREPARE_DMA    0x30a02910
 #define MCEXEC_UP_FREE_DMA       0x30a02911
@ -79,6 +80,17 @@ struct program_image_section {
 #define SHELL_PATH_MAX_LEN	1024
 #define MCK_RLIM_MAX	20

+struct get_cpu_set_arg {
+	int nr_processes;
+	void *cpu_set;
+	size_t cpu_set_size;	// Size in bytes
+	int *target_core;
+};
+
+#define PLD_CPU_SET_MAX_CPUS 1024
+typedef unsigned long __cpu_set_unit;
+#define PLD_CPU_SET_SIZE (PLD_CPU_SET_MAX_CPUS / (8 * sizeof(__cpu_set_unit)))
+
 struct program_load_desc {
 	int num_sections;
 	int status;
@ -108,6 +120,7 @@ struct program_load_desc {
 	struct rlimit rlimit[MCK_RLIM_MAX];
 	unsigned long interp_align;
 	char shell_path[SHELL_PATH_MAX_LEN];
+	__cpu_set_unit cpu_set[PLD_CPU_SET_SIZE];
 	struct program_image_section sections[0];
 };

--- a/executer/kernel/mcctrl/control.c
+++ b/executer/kernel/mcctrl/control.c
@ -34,6 +34,7 @@
 #include <linux/version.h>
 #include <linux/semaphore.h>
 #include <linux/interrupt.h>
+#include <linux/cpumask.h>
 #include <asm/uaccess.h>
 #include <asm/delay.h>
 #include <asm/io.h>
@ -292,8 +293,9 @@ int mcexec_transfer_image(ihk_os_t os, struct remote_transfer *__user upt)

 //extern unsigned long last_thread_exec;

-struct handlerinfo {
-	int	pid;
+struct release_handler_info {
+	int pid;
+	int cpu;
 };

 static long mcexec_debug_log(ihk_os_t os, unsigned long arg)
@ -309,7 +311,7 @@ static long mcexec_debug_log(ihk_os_t os, unsigned long arg)

 static void release_handler(ihk_os_t os, void *param)
 {
-	struct handlerinfo *info = param;
+	struct release_handler_info *info = param;
 	struct ikc_scd_packet isp;
 	int os_ind = ihk_host_os_get_index(os);

@ -317,10 +319,15 @@ static void release_handler(ihk_os_t os, void *param)
 	isp.msg = SCD_MSG_CLEANUP_PROCESS;
 	isp.pid = info->pid;

-	mcctrl_ikc_send(os, 0, &isp);
-	if(os_ind >= 0)
+	dprintk("%s: SCD_MSG_CLEANUP_PROCESS, info: %p, cpu: %d\n",
+			__FUNCTION__, info, info->cpu);
+	mcctrl_ikc_send(os, info->cpu, &isp);
+	if (os_ind >= 0) {
 		delete_pid_entry(os_ind, info->pid);
+	}
 	kfree(param);
+	dprintk("%s: SCD_MSG_CLEANUP_PROCESS, info: %p OK\n",
+			__FUNCTION__, info);
 }

 static long mcexec_newprocess(ihk_os_t os,
@ -328,12 +335,12 @@ static long mcexec_newprocess(ihk_os_t os,
                              struct file *file)
 {
 	struct newprocess_desc desc;
-	struct handlerinfo *info;
+	struct release_handler_info *info;

 	if (copy_from_user(&desc, udesc, sizeof(struct newprocess_desc))) {
 		return -EFAULT;
 	}
-	info = kmalloc(sizeof(struct handlerinfo), GFP_KERNEL);
+	info = kmalloc(sizeof(struct release_handler_info), GFP_KERNEL);
 	info->pid = desc.pid;
 	ihk_os_register_release_handler(file, release_handler, info);
 	return 0;
@ -347,7 +354,7 @@ static long mcexec_start_image(ihk_os_t os,
 	struct ikc_scd_packet isp;
 	struct mcctrl_channel *c;
 	struct mcctrl_usrdata *usrdata = ihk_host_os_get_usrdata(os);
-	struct handlerinfo *info;
+	struct release_handler_info *info;

 	desc = kmalloc(sizeof(*desc), GFP_KERNEL);
 	if (!desc) {
@ -362,8 +369,9 @@ static long mcexec_start_image(ihk_os_t os,
 		return -EFAULT;
 	}

-	info = kmalloc(sizeof(struct handlerinfo), GFP_KERNEL);
+	info = kmalloc(sizeof(struct release_handler_info), GFP_KERNEL);
 	info->pid = desc->pid;
+	info->cpu = desc->cpu;
 	ihk_os_register_release_handler(file, release_handler, info);

 	c = usrdata->channels + desc->cpu;
@ -460,6 +468,199 @@ static long mcexec_get_nodes(ihk_os_t os)
 	return usrdata->mem_info->n_numa_nodes;
 }

+extern int linux_numa_2_mckernel_numa(struct mcctrl_usrdata *udp, int numa_id);
+extern int mckernel_cpu_2_linux_cpu(struct mcctrl_usrdata *udp, int cpu_id);
+
+static long mcexec_get_cpuset(ihk_os_t os, unsigned long arg)
+{
+	struct mcctrl_usrdata *udp = ihk_host_os_get_usrdata(os);
+	struct mcctrl_part_exec *pe;
+	struct get_cpu_set_arg req;
+	struct cpu_topology *cpu_top, *cpu_top_i;
+	struct cache_topology *cache_top;
+	int cpu, cpus_assigned, cpus_to_assign, cpu_prev;
+	int ret = 0;
+	cpumask_t cpus_used;
+	cpumask_t cpus_to_use;
+	struct mcctrl_per_proc_data *ppd;
+
+	if (!udp) {
+		return -EINVAL;
+	}
+
+	/* Look up per-process structure */
+	ppd = mcctrl_get_per_proc_data(udp, task_tgid_vnr(current));
+	if (!ppd) {
+		return -EINVAL;
+	}
+
+	pe = &udp->part_exec;
+
+	if (copy_from_user(&req, (void *)arg, sizeof(req))) {
+		printk("%s: error copying user request\n", __FUNCTION__);
+		return -EINVAL;
+	}
+
+	mutex_lock(&pe->lock);
+
+	memcpy(&cpus_used, &pe->cpus_used, sizeof(cpumask_t));
+	memset(&cpus_to_use, 0, sizeof(cpus_to_use));
+
+	/* First process to enter CPU partitioning */
+	if (pe->nr_processes == -1) {
+		pe->nr_processes = req.nr_processes;
+		pe->nr_processes_left = req.nr_processes;
+		dprintk("%s: nr_processes: %d (partitioned exec starts)\n",
+				__FUNCTION__,
+				pe->nr_processes);
+	}
+
+	if (pe->nr_processes != req.nr_processes) {
+		printk("%s: error: requested number of processes"
+				" doesn't match current partitioned execution\n",
+				__FUNCTION__);
+		ret = -EINVAL;
+		goto unlock_out;
+	}
+
+	--pe->nr_processes_left;
+	dprintk("%s: nr_processes: %d, nr_processes_left: %d\n",
+			__FUNCTION__,
+			pe->nr_processes,
+			pe->nr_processes_left);
+
+	cpus_to_assign = udp->cpu_info->n_cpus / req.nr_processes;
+
+	/* Find the first unused CPU */
+	cpu = cpumask_next_zero(-1, &cpus_used);
+	if (cpu >= udp->cpu_info->n_cpus) {
+		printk("%s: error: no more CPUs available\n",
+				__FUNCTION__);
+		ret = -EINVAL;
+		goto unlock_out;
+	}
+
+	cpu_set(cpu, cpus_used);
+	cpu_set(cpu, cpus_to_use);
+	cpu_prev = cpu;
+	dprintk("%s: CPU %d assigned (first)\n", __FUNCTION__, cpu);
+
+	for (cpus_assigned = 1; cpus_assigned < cpus_to_assign;
+			++cpus_assigned) {
+		int node;
+
+		cpu_top = NULL;
+		/* Find the topology object of the last core assigned */
+		list_for_each_entry(cpu_top_i, &udp->cpu_topology_list, chain) {
+			if (cpu_top_i->mckernel_cpu_id == cpu_prev) {
+				cpu_top = cpu_top_i;
+				break;
+			}
+		}
+
+		if (!cpu_top) {
+			printk("%s: error: couldn't find CPU topology info\n",
+					__FUNCTION__);
+			ret = -EINVAL;
+			goto unlock_out;
+		}
+
+		/* Find a core sharing the same cache iterating caches from
+		 * the most inner one outwards */
+		list_for_each_entry(cache_top, &cpu_top->cache_list, chain) {
+			for_each_cpu(cpu, &cache_top->shared_cpu_map) {
+				if (!cpu_isset(cpu, cpus_used)) {
+					cpu_set(cpu, cpus_used);
+					cpu_set(cpu, cpus_to_use);
+					cpu_prev = cpu;
+					dprintk("%s: CPU %d assigned (same cache L%lu)\n",
+						__FUNCTION__, cpu, cache_top->saved->level);
+					goto next_cpu;
+				}
+			}
+		}
+
+		/* No CPU? Find a core from the same NUMA node */
+		node = linux_numa_2_mckernel_numa(udp,
+				cpu_to_node(mckernel_cpu_2_linux_cpu(udp, cpu_prev)));
+
+		for_each_cpu_not(cpu, &cpus_used) {
+			/* Invalid CPU? */
+			if (cpu >= udp->cpu_info->n_cpus)
+				break;
+
+			/* Found one */
+			if (node == linux_numa_2_mckernel_numa(udp,
+						cpu_to_node(mckernel_cpu_2_linux_cpu(udp, cpu)))) {
+				cpu_set(cpu, cpus_used);
+				cpu_set(cpu, cpus_to_use);
+				cpu_prev = cpu;
+				dprintk("%s: CPU %d assigned (same NUMA)\n",
+						__FUNCTION__, cpu);
+				goto next_cpu;
+			}
+		}
+
+		/* No CPU? Simply find the next unused one */
+		cpu = cpumask_next_zero(-1, &cpus_used);
+		if (cpu >= udp->cpu_info->n_cpus) {
+			printk("%s: error: no more CPUs available\n",
+					__FUNCTION__);
+			ret = -EINVAL;
+			goto unlock_out;
+		}
+
+		cpu_set(cpu, cpus_used);
+		cpu_set(cpu, cpus_to_use);
+		cpu_prev = cpu;
+		dprintk("%s: CPU %d assigned (unused)\n",
+				__FUNCTION__, cpu);
+
+next_cpu:
+		continue;
+	}
+
+	/* Found all cores, let user know */
+	if (copy_to_user(req.cpu_set, &cpus_to_use,
+				(req.cpu_set_size < sizeof(cpus_to_use) ?
+				 req.cpu_set_size : sizeof(cpus_to_use)))) {
+		printk("%s: error copying mask to user\n", __FUNCTION__);
+		ret = -EINVAL;
+		goto unlock_out;
+	}
+
+	cpu = cpumask_next(-1, &cpus_to_use);
+	if (copy_to_user(req.target_core, &cpu, sizeof(cpu))) {
+		printk("%s: error copying target core to user\n",
+				__FUNCTION__);
+		ret = -EINVAL;
+		goto unlock_out;
+	}
+
+	/* Save in per-process structure */
+	memcpy(&ppd->cpu_set, &cpus_to_use, sizeof(cpumask_t));
+	ppd->ikc_target_cpu = cpu;
+
+	/* Commit used cores to OS structure */
+	memcpy(&pe->cpus_used, &cpus_used, sizeof(cpus_used));
+
+	/* Reset if last process */
+	if (pe->nr_processes_left == 0) {
+		dprintk("%s: nr_processes: %d (partitioned exec ends)\n",
+				__FUNCTION__,
+				pe->nr_processes);
+		pe->nr_processes = -1;
+		memset(&pe->cpus_used, 0, sizeof(pe->cpus_used));
+	}
+
+	ret = 0;
+
+unlock_out:
+	mutex_unlock(&pe->lock);
+
+	return ret;
+}
+
 int mcctrl_add_per_proc_data(struct mcctrl_usrdata *ud, int pid, 
 	struct mcctrl_per_proc_data *ppd)
 {
@ -978,6 +1179,8 @@ int mcexec_open_exec(ihk_os_t os, char * __user filename)
 		INIT_LIST_HEAD(&ppd->wq_req_list);
 		INIT_LIST_HEAD(&ppd->wq_list_exact);
 		spin_lock_init(&ppd->wq_list_lock);
+		memset(&ppd->cpu_set, 0, sizeof(cpumask_t));
+		ppd->ikc_target_cpu = 0;

 		for (i = 0; i < MCCTRL_PER_THREAD_DATA_HASH_SIZE; ++i) {
 			INIT_LIST_HEAD(&ppd->per_thread_data_hash[i]);
@ -1279,6 +1482,9 @@ long __mcctrl_control(ihk_os_t os, unsigned int req, unsigned long arg,
 	case MCEXEC_UP_GET_NODES:
 		return mcexec_get_nodes(os);

+	case MCEXEC_UP_GET_CPUSET:
+		return mcexec_get_cpuset(os, arg);
+
 	case MCEXEC_UP_STRNCPY_FROM_USER:
 		return mcexec_strncpy_from_user(os, 
 				(struct strncpy_from_user_desc *)arg);
--- a/executer/kernel/mcctrl/driver.c
+++ b/executer/kernel/mcctrl/driver.c
@ -61,6 +61,7 @@ static struct ihk_os_user_call_handler mcctrl_uchs[] = {
 	{ .request = MCEXEC_UP_SEND_SIGNAL, .func = mcctrl_ioctl },
 	{ .request = MCEXEC_UP_GET_CPU, .func = mcctrl_ioctl },
 	{ .request = MCEXEC_UP_GET_NODES, .func = mcctrl_ioctl },
+	{ .request = MCEXEC_UP_GET_CPUSET, .func = mcctrl_ioctl },
 	{ .request = MCEXEC_UP_STRNCPY_FROM_USER, .func = mcctrl_ioctl },
 	{ .request = MCEXEC_UP_NEW_PROCESS, .func = mcctrl_ioctl },
 	{ .request = MCEXEC_UP_PREPARE_DMA, .func = mcctrl_ioctl },
--- a/executer/kernel/mcctrl/ikc.c
+++ b/executer/kernel/mcctrl/ikc.c
@ -240,7 +240,7 @@ static struct ihk_ikc_listen_param listen_param = {
 	.port = 501,
 	.handler = connect_handler,
 	.pkt_size = sizeof(struct ikc_scd_packet),
-	.queue_size = PAGE_SIZE,
+	.queue_size = PAGE_SIZE * 4,
 	.magic = 0x1129,
 };

@ -248,7 +248,7 @@ static struct ihk_ikc_listen_param listen_param2 = {
 	.port = 502,
 	.handler = connect_handler2,
 	.pkt_size = sizeof(struct ikc_scd_packet),
-	.queue_size = PAGE_SIZE,
+	.queue_size = PAGE_SIZE * 4,
 	.magic = 0x1329,
 };

@ -298,6 +298,9 @@ int prepare_ikc_channels(ihk_os_t os)
 	INIT_LIST_HEAD(&usrdata->cpu_topology_list);
 	INIT_LIST_HEAD(&usrdata->node_topology_list);

+	mutex_init(&usrdata->part_exec.lock);
+	usrdata->part_exec.nr_processes = -1;
+
 	return 0;
 }

--- a/executer/kernel/mcctrl/mcctrl.h
+++ b/executer/kernel/mcctrl/mcctrl.h
@ -198,6 +198,8 @@ struct mcctrl_per_proc_data {

 	struct list_head per_thread_data_hash[MCCTRL_PER_THREAD_DATA_HASH_SIZE];
 	rwlock_t per_thread_data_hash_lock[MCCTRL_PER_THREAD_DATA_HASH_SIZE];
+	cpumask_t cpu_set;
+	int ikc_target_cpu;
 };

 struct sysfsm_req {
@ -254,6 +256,13 @@ struct node_topology {
 	struct list_head chain;
 };

+struct mcctrl_part_exec {
+	struct mutex lock;	
+	int nr_processes;
+	int nr_processes_left;
+	cpumask_t cpus_used;
+};
+
 #define CPU_LONGS (((NR_CPUS) + (BITS_PER_LONG) - 1) / (BITS_PER_LONG))

 #define MCCTRL_PER_PROC_DATA_HASH_SHIFT 7
@ -284,6 +293,7 @@ struct mcctrl_usrdata {
 	nodemask_t numa_online;
 	struct list_head cpu_topology_list;
 	struct list_head node_topology_list;
+	struct mcctrl_part_exec part_exec;
 };

 struct mcctrl_signal {
--- a/executer/kernel/mcctrl/syscall.c
+++ b/executer/kernel/mcctrl/syscall.c
@ -746,6 +746,18 @@ static struct list_head pager_list = LIST_HEAD_INIT(pager_list);
 struct pager_create_result {
 	uintptr_t	handle;
 	int		maxprot;
+	uint32_t flags;
+	size_t size;
+};
+
+enum {
+	/* for memobj.flags */
+	MF_HAS_PAGER	= 0x0001,
+	MF_SHMDT_OK	= 0x0002,
+	MF_IS_REMOVABLE	= 0x0004,
+	MF_PREFETCH = 0x0008,
+	MF_ZEROFILL = 0x0010,
+	MF_END
 };

 static int pager_req_create(ihk_os_t os, int fd, uintptr_t result_pa)
@ -760,6 +772,7 @@ static int pager_req_create(ihk_os_t os, int fd, uintptr_t result_pa)
 	struct pager *newpager = NULL;
 	uintptr_t phys;
 	struct kstat st;
+	int mf_flags = 0;

 	dprintk("pager_req_create(%d,%lx)\n", fd, (long)result_pa);

@ -827,6 +840,32 @@ static int pager_req_create(ihk_os_t os, int fd, uintptr_t result_pa)
 			list_add(&newpager->list, &pager_list);
 			pager = newpager;
 			newpager = NULL;
+
+			/* Intel MPI library and shared memory "prefetch" */
+			{
+				char *pathbuf, *fullpath;
+
+				pathbuf = kmalloc(PATH_MAX, GFP_TEMPORARY);
+				if (pathbuf) {
+					fullpath = d_path(&file->f_path, pathbuf, PATH_MAX);
+					if (!IS_ERR(fullpath)) {
+						if (!strncmp("/dev/shm/Intel_MPI", fullpath, 18)) {
+							//mf_flags = (MF_PREFETCH | MF_ZEROFILL);
+							mf_flags = (MF_ZEROFILL);
+							dprintk("%s: filename: %s, zerofill\n",
+									__FUNCTION__, fullpath);
+						}
+						else if (strstr(fullpath, "libmpi") != NULL) {
+							mf_flags = MF_PREFETCH;
+							dprintk("%s: filename: %s, prefetch\n",
+									__FUNCTION__, fullpath);
+						}
+					}
+
+					kfree(pathbuf);
+				}
+			}
+
 			break;
 		}

@ -856,6 +895,8 @@ found:
 	resp = ihk_device_map_virtual(dev, phys, sizeof(*resp), NULL, 0);
 	resp->handle = (uintptr_t)pager;
 	resp->maxprot = maxprot;
+	resp->flags = mf_flags;
+	resp->size = st.size;
 	ihk_device_unmap_virtual(dev, resp, sizeof(*resp));
 	ihk_device_unmap_memory(dev, phys, sizeof(*resp));

--- a/executer/kernel/mcctrl/sysfs_files.c
+++ b/executer/kernel/mcctrl/sysfs_files.c
@ -197,19 +197,19 @@ void free_topology_info(ihk_os_t os)
 /*
 * CPU and NUMA node mapping conversion functions.
 */
-static int mckernel_cpu_2_linux_cpu(struct mcctrl_usrdata *udp, int cpu_id)
+int mckernel_cpu_2_linux_cpu(struct mcctrl_usrdata *udp, int cpu_id)
 {
 	return (cpu_id < udp->cpu_info->n_cpus) ?
 		udp->cpu_info->mapping[cpu_id] : -1;
 }

-static int mckernel_cpu_2_hw_id(struct mcctrl_usrdata *udp, int cpu_id)
+int mckernel_cpu_2_hw_id(struct mcctrl_usrdata *udp, int cpu_id)
 {
 	return (cpu_id < udp->cpu_info->n_cpus) ?
 		udp->cpu_info->hw_ids[cpu_id] : -1;
 }

-static int linux_cpu_2_mckernel_cpu(struct mcctrl_usrdata *udp, int cpu_id)
+int linux_cpu_2_mckernel_cpu(struct mcctrl_usrdata *udp, int cpu_id)
 {
 	int i;

@ -222,7 +222,7 @@ static int linux_cpu_2_mckernel_cpu(struct mcctrl_usrdata *udp, int cpu_id)
 }

 #if 0
-static int hw_id_2_mckernel_cpu(struct mcctrl_usrdata *udp, int hw_id)
+int hw_id_2_mckernel_cpu(struct mcctrl_usrdata *udp, int hw_id)
 {
 	int i;

@ -235,7 +235,7 @@ static int hw_id_2_mckernel_cpu(struct mcctrl_usrdata *udp, int hw_id)
 	return -1;
 }

-static int hw_id_2_linux_cpu(struct mcctrl_usrdata *udp, int hw_id)
+int hw_id_2_linux_cpu(struct mcctrl_usrdata *udp, int hw_id)
 {
 	int i;

@ -248,7 +248,7 @@ static int hw_id_2_linux_cpu(struct mcctrl_usrdata *udp, int hw_id)
 	return -1;
 }

-static int linux_cpu_2_hw_id(struct mcctrl_usrdata *udp, int cpu)
+int linux_cpu_2_hw_id(struct mcctrl_usrdata *udp, int cpu)
 {
 	int mckernel_cpu = linux_cpu_2_mckernel_cpu(udp, cpu);

@ -257,13 +257,13 @@ static int linux_cpu_2_hw_id(struct mcctrl_usrdata *udp, int cpu)
 }
 #endif

-static int mckernel_numa_2_linux_numa(struct mcctrl_usrdata *udp, int numa_id)
+int mckernel_numa_2_linux_numa(struct mcctrl_usrdata *udp, int numa_id)
 {
 	return (numa_id < udp->mem_info->n_numa_nodes) ?
 		udp->mem_info->numa_mapping[numa_id] : -1;
 }

-static int linux_numa_2_mckernel_numa(struct mcctrl_usrdata *udp, int numa_id)
+int linux_numa_2_mckernel_numa(struct mcctrl_usrdata *udp, int numa_id)
 {
 	int i;

--- a/executer/user/mcexec.c
+++ b/executer/user/mcexec.c
@ -153,6 +153,10 @@ static const char rlimit_stack_envname[] = "MCKERNEL_RLIMIT_STACK";
 static int ischild;
 static int enable_vdso = 1;

+/* Partitioned execution (e.g., for MPI) */
+static int nr_processes = 0;
+static int nr_threads = -1;
+
 struct fork_sync {
 	pid_t pid;
 	int status;
@ -502,7 +506,7 @@ retry:

 	/* Check whether the resolved path is a symlink */
 	if (lstat(path, &sb) == -1) {
-		fprintf(stderr, "lookup_exec_path(): error stat\n");
+		__dprintf(stderr, "lookup_exec_path(): error stat\n");
 		return errno;
 	}

@ -1102,7 +1106,7 @@ static int reduce_stack(struct rlimit *orig_rlim, char *argv[])

 void print_usage(char **argv)
 {
-	fprintf(stderr, "Usage: %s [-c target_core] [<mcos-id>] (program) [args...]\n", argv[0]);
+	fprintf(stderr, "Usage: %s [-c target_core] [-n nr_partitions] [<mcos-id>] (program) [args...]\n", argv[0]);
 }

 void init_sigaction(void)
@ -1329,12 +1333,20 @@ int main(int argc, char **argv)
 	}
           
 	/* Parse options ("+" denotes stop at the first non-option) */
-	while ((opt = getopt_long(argc, argv, "+c:", mcexec_options, NULL)) != -1) {
+	while ((opt = getopt_long(argc, argv, "+c:n:t:", mcexec_options, NULL)) != -1) {
 		switch (opt) {
 			case 'c':
 				target_core = atoi(optarg);
 				break;
-			
+
+			case 'n':
+				nr_processes = atoi(optarg);
+				break;
+
+			case 't':
+				nr_threads = atoi(optarg);
+				break;
+
 			case 0:	/* long opt */
 				break;

@ -1550,7 +1562,16 @@ int main(int argc, char **argv)
 		return 1;
 	}

-	n_threads = ncpu;
+	if (nr_threads > 0) {
+		n_threads = nr_threads;
+	}
+	else if (getenv("OMP_NUM_THREADS")) {
+		/* Leave some headroom for helper threads.. */
+		n_threads = atoi(getenv("OMP_NUM_THREADS")) + 4;
+	}
+	else {
+		n_threads = ncpu;
+	}

 	/* 
 	 * XXX: keep thread_data ncpu sized despite that there are only
@ -1599,6 +1620,24 @@ int main(int argc, char **argv)
 		exit(1);
 	}

+	/* Partitioned execution, obtain CPU set */
+	if (nr_processes > 0) {
+		struct get_cpu_set_arg cpu_set_arg;
+
+		cpu_set_arg.cpu_set = (void *)&desc->cpu_set;
+		cpu_set_arg.cpu_set_size = sizeof(desc->cpu_set);
+		cpu_set_arg.nr_processes = nr_processes;
+		cpu_set_arg.target_core = &target_core;
+		
+		if (ioctl(fd, MCEXEC_UP_GET_CPUSET, (void *)&cpu_set_arg) != 0) {
+			perror("getting CPU set for partitioned execution");
+			close(fd);
+			return 1;
+		}
+		
+		desc->cpu = target_core;
+	}
+	
 	if (ioctl(fd, MCEXEC_UP_PREPARE_IMAGE, (unsigned long)desc) != 0) {
 		perror("prepare");
 		close(fd);
@ -1910,9 +1949,18 @@ int close_cloexec_fds(int mcos_fd)
 	return 0;
 }

+void chgdevpath(char *in, char *buf)
+{
+	if(!strcmp(in, "/dev/xpmem")){
+		sprintf(in, "/dev/null");
+	}
+}
+
 char *
 chgpath(char *in, char *buf)
 {
+	chgdevpath(in, buf);
+
 #ifdef ENABLE_MCOVERLAYFS
 	return in;
 #endif // ENABLE_MCOVERLAYFS
--- a/kernel/Makefile.build.in
+++ b/kernel/Makefile.build.in
@ -3,7 +3,7 @@ SRC=$(VPATH)
 IHKDIR=$(IHKBASE)/$(TARGETDIR)
 OBJS = init.o mem.o debug.o mikc.o listeners.o ap.o syscall.o cls.o host.o
 OBJS += process.o copy.o waitq.o futex.o timer.o plist.o fileobj.o shmobj.o
-OBJS += zeroobj.o procfs.o devobj.o sysfs.o
+OBJS += zeroobj.o procfs.o devobj.o sysfs.o xpmem.o
 DEPSRCS=$(wildcard $(SRC)/*.c)

 CFLAGS += -I$(SRC)/include -D__KERNEL__ -g -fno-omit-frame-pointer -fno-inline -fno-inline-small-functions
--- a/kernel/cls.c
+++ b/kernel/cls.c
@ -23,7 +23,7 @@
 extern int num_processors;

 struct cpu_local_var *clv;
-static int cpu_local_var_initialized = 0;
+int cpu_local_var_initialized = 0;

 void cpu_local_var_init(void)
 {
--- a/kernel/devobj.c
+++ b/kernel/devobj.c
@ -127,6 +127,7 @@ int devobj_create(int fd, size_t len, off_t off, struct memobj **objp, int *maxp

 	obj->memobj.ops = &devobj_ops;
 	obj->memobj.flags = MF_HAS_PAGER;
+	obj->memobj.size = len;
 	obj->handle = result.handle;
 	obj->ref = 1;
 	obj->pfn_pgoff = off / PAGE_SIZE;
--- a/kernel/fileobj.c
+++ b/kernel/fileobj.c
@ -29,22 +29,27 @@
 #define	dkprintf(...)	do { if (0) kprintf(__VA_ARGS__); } while (0)
 #define	ekprintf(...)	kprintf(__VA_ARGS__)

-static ihk_spinlock_t fileobj_list_lock = SPIN_LOCK_UNLOCKED;
+mcs_rwlock_lock_t fileobj_list_lock =
+	{{{0}, MCS_RWLOCK_TYPE_COMMON_READER, 0, 0, 0, NULL}, NULL};
 static LIST_HEAD(fileobj_list);

+#define FILEOBJ_PAGE_HASH_SHIFT 9
+#define FILEOBJ_PAGE_HASH_SIZE (1 << FILEOBJ_PAGE_HASH_SHIFT)
+#define FILEOBJ_PAGE_HASH_MASK (FILEOBJ_PAGE_HASH_SIZE - 1)
+
 struct fileobj {
-	struct memobj		memobj;		/* must be first */
-	long			sref;
-	long			cref;
-	uintptr_t		handle;
-	struct list_head	page_list;
-	struct list_head	list;
+	struct memobj memobj;		/* must be first */
+	long sref;
+	long cref;
+	uintptr_t handle;
+	struct list_head list;
+	struct list_head page_hash[FILEOBJ_PAGE_HASH_SIZE];
+	mcs_rwlock_lock_t page_hash_locks[FILEOBJ_PAGE_HASH_SIZE];
 };

 static memobj_release_func_t fileobj_release;
 static memobj_ref_func_t fileobj_ref;
 static memobj_get_page_func_t fileobj_get_page;
-static memobj_copy_page_func_t fileobj_copy_page;
 static memobj_flush_page_func_t fileobj_flush_page;
 static memobj_invalidate_page_func_t fileobj_invalidate_page;
 static memobj_lookup_page_func_t fileobj_lookup_page;
@ -53,7 +58,7 @@ static struct memobj_ops fileobj_ops = {
 	.release =	&fileobj_release,
 	.ref =		&fileobj_ref,
 	.get_page =	&fileobj_get_page,
-	.copy_page =	&fileobj_copy_page,
+	.copy_page =	NULL,
 	.flush_page =	&fileobj_flush_page,
 	.invalidate_page =	&fileobj_invalidate_page,
 	.lookup_page =	&fileobj_lookup_page,
@ -72,28 +77,36 @@ static struct memobj *to_memobj(struct fileobj *fileobj)
 /***********************************************************************
 * page_list
 */
-static void page_list_init(struct fileobj *obj)
+static void fileobj_page_hash_init(struct fileobj *obj)
 {
-	INIT_LIST_HEAD(&obj->page_list);
+	int i;
+	for (i = 0; i < FILEOBJ_PAGE_HASH_SIZE; ++i) {
+		mcs_rwlock_init(&obj->page_hash_locks[i]);
+		INIT_LIST_HEAD(&obj->page_hash[i]);
+	}
 	return;
 }

-static void page_list_insert(struct fileobj *obj, struct page *page)
+/* NOTE: caller must hold page_hash_locks[hash] */
+static void __fileobj_page_hash_insert(struct fileobj *obj,
+		struct page *page, int hash)
 {
-	list_add(&page->list, &obj->page_list);
-	return;
+	list_add(&page->list, &obj->page_hash[hash]);
 }

-static void page_list_remove(struct fileobj *obj, struct page *page)
+/* NOTE: caller must hold page_hash_locks[hash] */
+static void __fileobj_page_hash_remove(struct page *page)
 {
 	list_del(&page->list);
 }

-static struct page *page_list_lookup(struct fileobj *obj, off_t off)
+/* NOTE: caller must hold page_hash_locks[hash] */
+static struct page *__fileobj_page_hash_lookup(struct fileobj *obj,
+		int hash, off_t off)
 {
 	struct page *page;

-	list_for_each_entry(page, &obj->page_list, list) {
+	list_for_each_entry(page, &obj->page_hash[hash], list) {
 		if ((page->mode != PM_WILL_PAGEIO)
 				&& (page->mode != PM_PAGEIO)
 				&& (page->mode != PM_DONE_PAGEIO)
@ -104,6 +117,7 @@ static struct page *page_list_lookup(struct fileobj *obj, off_t off)
 					obj, off, page->mode);
 			panic("page_list_lookup:invalid obj page");
 		}
+
 		if (page->offset == off) {
 			goto out;
 		}
@ -114,13 +128,22 @@ out:
 	return page;
 }

-static struct page *page_list_first(struct fileobj *obj)
+static struct page *fileobj_page_hash_first(struct fileobj *obj)
 {
-	if (list_empty(&obj->page_list)) {
-		return NULL;
+	int i;
+
+	for (i = 0; i < FILEOBJ_PAGE_HASH_SIZE; ++i) {
+		if (!list_empty(&obj->page_hash[i])) {
+			break;
+		}
 	}

-	return list_first_entry(&obj->page_list, struct page, list);
+	if (i != FILEOBJ_PAGE_HASH_SIZE) {
+		return list_first_entry(&obj->page_hash[i], struct page, list);
+	}
+	else {
+		return NULL;
+	}
 }

 /***********************************************************************
@ -163,10 +186,11 @@ static struct fileobj *obj_list_lookup(uintptr_t handle)
 int fileobj_create(int fd, struct memobj **objp, int *maxprotp)
 {
 	ihk_mc_user_context_t ctx;
-	struct pager_create_result result;	// XXX: assumes contiguous physical
+	struct pager_create_result result __attribute__((aligned(64)));	
 	int error;
 	struct fileobj *newobj  = NULL;
 	struct fileobj *obj;
+	struct mcs_rwlock_node node;

 	dkprintf("fileobj_create(%d)\n", fd);
 	newobj = kmalloc(sizeof(*newobj), IHK_MC_AP_NOWAIT);
@ -179,6 +203,7 @@ int fileobj_create(int fd, struct memobj **objp, int *maxprotp)
 	ihk_mc_syscall_arg0(&ctx) = PAGER_REQ_CREATE;
 	ihk_mc_syscall_arg1(&ctx) = fd;
 	ihk_mc_syscall_arg2(&ctx) = virt_to_phys(&result);
+	memset(&result, 0, sizeof(result));

 	error = syscall_generic_forwarding(__NR_mmap, &ctx);
 	if (error) {
@ -192,23 +217,39 @@ int fileobj_create(int fd, struct memobj **objp, int *maxprotp)
 	newobj->handle = result.handle;
 	newobj->sref = 1;
 	newobj->cref = 1;
-	page_list_init(newobj);
+	fileobj_page_hash_init(newobj);
 	ihk_mc_spinlock_init(&newobj->memobj.lock);

-	ihk_mc_spinlock_lock_noirq(&fileobj_list_lock);
+	mcs_rwlock_writer_lock_noirq(&fileobj_list_lock, &node);
 	obj = obj_list_lookup(result.handle);
 	if (!obj) {
 		obj_list_insert(newobj);
 		obj = newobj;
+		to_memobj(obj)->size = result.size;
+		to_memobj(obj)->flags |= result.flags;
+		to_memobj(obj)->status = MEMOBJ_READY;
+		if (to_memobj(obj)->flags & MF_PREFETCH) {
+			to_memobj(obj)->status = MEMOBJ_TO_BE_PREFETCHED;
+		}
 		newobj = NULL;
+		dkprintf("%s: new obj 0x%lx cref: %d, %s\n",
+			__FUNCTION__,
+			obj,
+			obj->cref,
+			to_memobj(obj)->flags & MF_ZEROFILL ? "zerofill" : "");
 	}
 	else {
 		++obj->sref;
 		++obj->cref;
 		memobj_unlock(&obj->memobj);	/* locked by obj_list_lookup() */
+		dkprintf("%s: existing obj 0x%lx cref: %d, %s\n",
+			__FUNCTION__,
+			obj,
+			obj->cref,
+			to_memobj(obj)->flags & MF_ZEROFILL ? "zerofill" : "");
 	}

-	ihk_mc_spinlock_unlock_noirq(&fileobj_list_lock);
+	mcs_rwlock_writer_unlock_noirq(&fileobj_list_lock, &node);

 	error = 0;
 	*objp = to_memobj(obj);
@ -239,6 +280,7 @@ static void fileobj_release(struct memobj *memobj)
 	long free_sref = 0;
 	uintptr_t free_handle;
 	struct fileobj *free_obj = NULL;
+	struct mcs_rwlock_node node;

 	dkprintf("fileobj_release(%p %lx)\n", obj, obj->handle);

@ -254,17 +296,23 @@ static void fileobj_release(struct memobj *memobj)
 	memobj_unlock(&obj->memobj);

 	if (free_obj) {
-		ihk_mc_spinlock_lock_noirq(&fileobj_list_lock);
+		dkprintf("%s: release obj 0x%lx cref: %d, free_obj: 0x%lx, %s\n",
+				__FUNCTION__,
+				obj,
+				obj->cref,
+				free_obj,
+				to_memobj(obj)->flags & MF_ZEROFILL ? "zerofill" : "");
+		mcs_rwlock_writer_lock_noirq(&fileobj_list_lock, &node);
 		/* zap page_list */
 		for (;;) {
 			struct page *page;
 			void *page_va;

-			page = page_list_first(obj);
+			page = fileobj_page_hash_first(obj);
 			if (!page) {
 				break;
 			}
-			page_list_remove(obj, page);
+			__fileobj_page_hash_remove(page);
 			page_va = phys_to_virt(page_to_phys(page));

 			if (ihk_atomic_read(&page->count) != 1) {
@ -295,7 +343,7 @@ static void fileobj_release(struct memobj *memobj)
 #endif
 		}
 		obj_list_remove(free_obj);
-		ihk_mc_spinlock_unlock_noirq(&fileobj_list_lock);
+		mcs_rwlock_writer_unlock_noirq(&fileobj_list_lock, &node);
 		kfree(free_obj);
 	}

@ -341,83 +389,101 @@ static void fileobj_do_pageio(void *args0)
 	struct page *page;
 	ihk_mc_user_context_t ctx;
 	ssize_t ss;
+	struct mcs_rwlock_node mcs_node;
+	int hash = (off >> PAGE_SHIFT) & FILEOBJ_PAGE_HASH_MASK;	

-	memobj_lock(&obj->memobj);
-	page = page_list_lookup(obj, off);
+	mcs_rwlock_writer_lock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
+	page = __fileobj_page_hash_lookup(obj, hash, off);
 	if (!page) {
 		goto out;
 	}

 	while (page->mode == PM_PAGEIO) {
-		memobj_unlock(&obj->memobj);
+		mcs_rwlock_writer_unlock_noirq(&obj->page_hash_locks[hash],
+				&mcs_node);
 		cpu_pause();
-		memobj_lock(&obj->memobj);
+		mcs_rwlock_writer_lock_noirq(&obj->page_hash_locks[hash],
+				&mcs_node);
 	}

 	if (page->mode == PM_WILL_PAGEIO) {
-		page->mode = PM_PAGEIO;
-		memobj_unlock(&obj->memobj);
-
-		ihk_mc_syscall_arg0(&ctx) = PAGER_REQ_READ;
-		ihk_mc_syscall_arg1(&ctx) = obj->handle;
-		ihk_mc_syscall_arg2(&ctx) = off;
-		ihk_mc_syscall_arg3(&ctx) = pgsize;
-		ihk_mc_syscall_arg4(&ctx) = page_to_phys(page);
-
-		ss = syscall_generic_forwarding(__NR_mmap, &ctx);
-
-		memobj_lock(&obj->memobj);
-		if (page->mode != PM_PAGEIO) {
-			kprintf("fileobj_do_pageio(%p,%lx,%lx):"
-					"invalid mode %x\n",
-					obj, off, pgsize, page->mode);
-			panic("fileobj_do_pageio:invalid page mode");
+		if (to_memobj(obj)->flags & MF_ZEROFILL) {
+			void *virt = phys_to_virt(page_to_phys(page));
+			memset(virt, 0, PAGE_SIZE);
 		}
+		else {
+			page->mode = PM_PAGEIO;
+			mcs_rwlock_writer_unlock_noirq(&obj->page_hash_locks[hash],
+					&mcs_node);

-		if (ss == 0) {
-			dkprintf("fileobj_do_pageio(%p,%lx,%lx):EOF? %ld\n",
-					obj, off, pgsize, ss);
-			page->mode = PM_PAGEIO_EOF;
-			goto out;
-		}
-		else if (ss != pgsize) {
-			kprintf("fileobj_do_pageio(%p,%lx,%lx):"
-					"read failed. %ld\n",
-					obj, off, pgsize, ss);
-			page->mode = PM_PAGEIO_ERROR;
-			goto out;
+			ihk_mc_syscall_arg0(&ctx) = PAGER_REQ_READ;
+			ihk_mc_syscall_arg1(&ctx) = obj->handle;
+			ihk_mc_syscall_arg2(&ctx) = off;
+			ihk_mc_syscall_arg3(&ctx) = pgsize;
+			ihk_mc_syscall_arg4(&ctx) = page_to_phys(page);
+
+			dkprintf("%s: __NR_mmap for handle 0x%lx\n",
+					__FUNCTION__, obj->handle);
+			ss = syscall_generic_forwarding(__NR_mmap, &ctx);
+
+			mcs_rwlock_writer_lock_noirq(&obj->page_hash_locks[hash],
+					&mcs_node);
+			if (page->mode != PM_PAGEIO) {
+				kprintf("fileobj_do_pageio(%p,%lx,%lx):"
+						"invalid mode %x\n",
+						obj, off, pgsize, page->mode);
+				panic("fileobj_do_pageio:invalid page mode");
+			}
+
+			if (ss == 0) {
+				dkprintf("fileobj_do_pageio(%p,%lx,%lx):EOF? %ld\n",
+						obj, off, pgsize, ss);
+				page->mode = PM_PAGEIO_EOF;
+				goto out;
+			}
+			else if (ss != pgsize) {
+				kprintf("fileobj_do_pageio(%p,%lx,%lx):"
+						"read failed. %ld\n",
+						obj, off, pgsize, ss);
+				page->mode = PM_PAGEIO_ERROR;
+				goto out;
+			}
 		}

 		page->mode = PM_DONE_PAGEIO;
 	}
 out:
-	memobj_unlock(&obj->memobj);
+	mcs_rwlock_writer_unlock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
 	fileobj_release(&obj->memobj);		/* got fileobj_get_page() */
 	kfree(args0);
 	dkprintf("fileobj_do_pageio(%p,%lx,%lx):\n", obj, off, pgsize);
 	return;
 }

-static int fileobj_get_page(struct memobj *memobj, off_t off, int p2align, uintptr_t *physp, unsigned long *pflag)
+static int fileobj_get_page(struct memobj *memobj, off_t off,
+		int p2align, uintptr_t *physp, unsigned long *pflag)
 {
 	struct thread *proc = cpu_local_var(current);
 	struct fileobj *obj = to_fileobj(memobj);
-	int error;
+	int error = -1;
 	void *virt = NULL;
 	int npages;
 	uintptr_t phys = -1;
 	struct page *page;
 	struct pageio_args *args = NULL;
+	struct mcs_rwlock_node mcs_node;
+	int hash = (off >> PAGE_SHIFT) & FILEOBJ_PAGE_HASH_MASK;	

 	dkprintf("fileobj_get_page(%p,%lx,%x,%p)\n", obj, off, p2align, physp);
-
-	memobj_lock(&obj->memobj);
 	if (p2align != PAGE_P2ALIGN) {
-		error = -ENOMEM;
-		goto out;
+		return -ENOMEM;
 	}

-	page = page_list_lookup(obj, off);
+	mcs_rwlock_writer_lock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
+	page = __fileobj_page_hash_lookup(obj, hash, off);
 	if (!page || (page->mode == PM_WILL_PAGEIO)
 			|| (page->mode == PM_PAGEIO)) {
 		args = kmalloc(sizeof(*args), IHK_MC_AP_NOWAIT);
@ -445,13 +511,15 @@ static int fileobj_get_page(struct memobj *memobj, off_t off, int p2align, uintp
 			if (page->mode != PM_NONE) {
 				panic("fileobj_get_page:invalid new page");
 			}
-			page->mode = PM_WILL_PAGEIO;
 			page->offset = off;
 			ihk_atomic_set(&page->count, 1);
-			page_list_insert(obj, page);
+			__fileobj_page_hash_insert(obj, page, hash);
+			page->mode = PM_WILL_PAGEIO;
 		}

+		memobj_lock(&obj->memobj);
 		++obj->cref;	/* for fileobj_do_pageio() */
+		memobj_unlock(&obj->memobj);

 		args->fileobj = obj;
 		args->objoff = off;
@ -483,7 +551,8 @@ static int fileobj_get_page(struct memobj *memobj, off_t off, int p2align, uintp
 	*physp = page_to_phys(page);
 	virt = NULL;
 out:
-	memobj_unlock(&obj->memobj);
+	mcs_rwlock_writer_unlock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
 	if (virt) {
 		ihk_mc_free_pages(virt, npages);
 	}
@ -495,78 +564,6 @@ out:
 	return error;
 }

-static uintptr_t fileobj_copy_page(
-		struct memobj *memobj, uintptr_t orgpa, int p2align)
-{
-	struct page *orgpage = phys_to_page(orgpa);
-	size_t pgsize = PAGE_SIZE << p2align;
-	int npages = 1 << p2align;
-	void *newkva = NULL;
-	uintptr_t newpa = -1;
-	void *orgkva;
-	int count;
-
-	dkprintf("fileobj_copy_page(%p,%lx,%d)\n", memobj, orgpa, p2align);
-	if (p2align != PAGE_P2ALIGN) {
-		panic("p2align");
-	}
-
-	memobj_lock(memobj);
-	for (;;) {
-		if (!orgpage || orgpage->mode != PM_MAPPED) {
-			kprintf("fileobj_copy_page(%p,%lx,%d):"
-					"invalid cow page. %x\n",
-					memobj, orgpa, p2align, orgpage ? orgpage->mode : 0);
-			panic("fileobj_copy_page:invalid cow page");
-		}
-		count = ihk_atomic_read(&orgpage->count);
-		if (count == 2) {	// XXX: private only
-			list_del(&orgpage->list);
-			ihk_atomic_dec(&orgpage->count);
-			orgpage->mode = PM_NONE;
-			newpa = orgpa;
-			break;
-		}
-		if (count <= 0) {
-			kprintf("fileobj_copy_page(%p,%lx,%d):"
-					"orgpage count corrupted. %x\n",
-					memobj, orgpa, p2align, count);
-			panic("fileobj_copy_page:orgpage count corrupted");
-		}
-		if (newkva) {
-			orgkva = phys_to_virt(orgpa);
-			memcpy(newkva, orgkva, pgsize);
-			ihk_atomic_dec(&orgpage->count);
-			newpa = virt_to_phys(newkva);
-			if (phys_to_page(newpa)) {
-				page_map(phys_to_page(newpa));
-			}
-			newkva = NULL;	/* avoid ihk_mc_free_pages() */
-			break;
-		}
-
-		memobj_unlock(memobj);
-		newkva = ihk_mc_alloc_aligned_pages(npages, p2align,
-				IHK_MC_AP_NOWAIT);
-		if (!newkva) {
-			kprintf("fileobj_copy_page(%p,%lx,%d):"
-					"alloc page failed\n",
-					memobj, orgpa, p2align);
-			goto out;
-		}
-		memobj_lock(memobj);
-	}
-	memobj_unlock(memobj);
-
-out:
-	if (newkva) {
-		ihk_mc_free_pages(newkva, npages);
-	}
-	dkprintf("fileobj_copy_page(%p,%lx,%d): %lx\n",
-			memobj, orgpa, p2align, newpa);
-	return newpa;
-}
-
 static int fileobj_flush_page(struct memobj *memobj, uintptr_t phys,
 		size_t pgsize)
 {
@ -575,6 +572,10 @@ static int fileobj_flush_page(struct memobj *memobj, uintptr_t phys,
 	ihk_mc_user_context_t ctx;
 	ssize_t ss;

+	if (to_memobj(obj)->flags & MF_ZEROFILL) {
+		return 0;
+	}
+
 	page = phys_to_page(phys);
 	if (!page) {
 		kprintf("%s: warning: tried to flush non-existing page for phys addr: 0x%lx\n", 
@ -603,63 +604,48 @@ static int fileobj_flush_page(struct memobj *memobj, uintptr_t phys,
 static int fileobj_invalidate_page(struct memobj *memobj, uintptr_t phys,
 		size_t pgsize)
 {
-	struct fileobj *obj = to_fileobj(memobj);
-	int error;
-	struct page *page;
-
 	dkprintf("fileobj_invalidate_page(%p,%#lx,%#lx)\n",
 			memobj, phys, pgsize);

-	if (!(page = phys_to_page(phys))
-			|| !(page = page_list_lookup(obj, page->offset))) {
-		error = 0;
-		goto out;
-	}
-
-	if (ihk_atomic_read(&page->count) == 1) {
-		if (page_unmap(page)) {
-			ihk_mc_free_pages(phys_to_virt(phys),
-					pgsize/PAGE_SIZE);
-		}
-	}
-
-	error = 0;
-out:
-	dkprintf("fileobj_invalidate_page(%p,%#lx,%#lx):%d\n",
-			memobj, phys, pgsize, error);
-	return error;
+	/* TODO: keep track of reverse mappings so that invalidation
+	 * can be performed */
+	kprintf("%s: WARNING: file mapping invalidation not supported\n",
+		__FUNCTION__);
+	return 0;
 }

-static int fileobj_lookup_page(struct memobj *memobj, off_t off, int p2align, uintptr_t *physp, unsigned long *pflag)
+static int fileobj_lookup_page(struct memobj *memobj, off_t off,
+		int p2align, uintptr_t *physp, unsigned long *pflag)
 {
 	struct fileobj *obj = to_fileobj(memobj);
-	int error;
-	uintptr_t phys = -1;
+	int error = -1;
 	struct page *page;
+	struct mcs_rwlock_node mcs_node;
+	int hash = (off >> PAGE_SHIFT) & FILEOBJ_PAGE_HASH_MASK;

 	dkprintf("fileobj_lookup_page(%p,%lx,%x,%p)\n", obj, off, p2align, physp);

-	memobj_lock(&obj->memobj);
 	if (p2align != PAGE_P2ALIGN) {
-		error = -ENOMEM;
-		goto out;
+		return -ENOMEM;
 	}

-	page = page_list_lookup(obj, off);
+	mcs_rwlock_reader_lock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
+
+	page = __fileobj_page_hash_lookup(obj, hash, off);
 	if (!page) {
-		error = -ENOENT;
-		dkprintf("fileobj_lookup_page(%p,%lx,%x,%p): page not found. %d\n", obj, off, p2align, physp, error);
 		goto out;
 	}
-	phys = page_to_phys(page);

+	*physp = page_to_phys(page);
 	error = 0;
-	if (physp) {
-		*physp = phys;
-	}
+
 out:
-	memobj_unlock(&obj->memobj);
-	dkprintf("fileobj_lookup_page(%p,%lx,%x,%p): %d %lx\n",
-			obj, off, p2align, physp, error, phys);
+	mcs_rwlock_reader_unlock_noirq(&obj->page_hash_locks[hash],
+			&mcs_node);
+
+	dkprintf("fileobj_lookup_page(%p,%lx,%x,%p): %d \n",
+			obj, off, p2align, physp, error);
 	return error;
 }
+
--- a/kernel/host.c
+++ b/kernel/host.c
@ -393,7 +393,9 @@ static int process_msg_prepare_process(unsigned long rphys)
 	memcpy_long(pn, p, sizeof(struct program_load_desc) 
 	            + sizeof(struct program_image_section) * n);

-	if((thread = create_thread(p->entry)) == NULL){
+	if ((thread = create_thread(p->entry,
+					(unsigned long *)&p->cpu_set,
+					sizeof(p->cpu_set))) == NULL) {
 		kfree(pn);
 		ihk_mc_unmap_virtual(p, npages, 1);
 		ihk_mc_unmap_memory(NULL, phys, sz);
@ -579,14 +581,16 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
 		break;

 	case SCD_MSG_SCHEDULE_PROCESS:
-		cpuid = obtain_clone_cpuid();
-		if(cpuid == -1){
+		thread = (struct thread *)packet->arg;
+
+		cpuid = obtain_clone_cpuid(&thread->cpu_set);
+		if (cpuid == -1) {
 			kprintf("No CPU available\n");
 			ret = -1;
 			break;
 		}
+
 		dkprintf("SCD_MSG_SCHEDULE_PROCESS: %lx\n", packet->arg);
-		thread = (struct thread *)packet->arg;
 		proc = thread->proc;
 		thread->tid = proc->pid;
 		proc->status = PS_RUNNING;
@ -594,8 +598,7 @@ static int syscall_packet_handler(struct ihk_ikc_channel_desc *c,
 		chain_thread(thread);
 		chain_process(proc);
 		runq_add_thread(thread, cpuid);
-					  
-		//cpu_local_var(next) = (struct thread *)packet->arg;
+
 		ret = 0;
 		break;

@ -683,7 +686,7 @@ void init_host_syscall_channel(void)

 	param.port = 501;
 	param.pkt_size = sizeof(struct ikc_scd_packet);
-	param.queue_size = PAGE_SIZE;
+	param.queue_size = PAGE_SIZE * 4;
 	param.magic = 0x1129;
 	param.handler = syscall_packet_handler;

@ -710,7 +713,7 @@ void init_host_syscall_channel2(void)

 	param.port = 502;
 	param.pkt_size = sizeof(struct ikc_scd_packet);
-	param.queue_size = PAGE_SIZE;
+	param.queue_size = PAGE_SIZE * 4;
 	param.magic = 0x1329;
 	param.handler = syscall_packet_handler;

--- a/kernel/include/init.h
+++ b/kernel/include/init.h
@ -16,7 +16,7 @@
 extern void arch_init(void);
 extern void kmsg_init(int);
 extern void mem_init(void);
-extern void ikc_master_init(void);
+extern void ihk_ikc_master_init(void);
 extern void ap_init(void);
 extern void arch_ready(void);
 extern void mc_ikc_test_init(void);
--- a/kernel/include/memobj.h
+++ b/kernel/include/memobj.h
@ -32,13 +32,20 @@ enum {
 	MF_HAS_PAGER	= 0x0001,
 	MF_SHMDT_OK	= 0x0002,
 	MF_IS_REMOVABLE	= 0x0004,
+	MF_PREFETCH = 0x0008,
+	MF_ZEROFILL = 0x0010,
+	MF_END
 };

+#define MEMOBJ_READY              0
+#define MEMOBJ_TO_BE_PREFETCHED   1
+
 struct memobj {
-	struct memobj_ops *	ops;
-	uint32_t		flags;
-	int8_t			padding[4];
-	ihk_spinlock_t		lock;
+	struct memobj_ops *ops;
+	uint32_t flags;
+	uint32_t status;
+	size_t size;
+	ihk_spinlock_t lock;
 };

 typedef void memobj_release_func_t(struct memobj *obj);
--- a/kernel/include/pager.h
+++ b/kernel/include/pager.h
@ -30,7 +30,8 @@ enum pager_op {
 struct pager_create_result {
 	uintptr_t	handle;
 	int		maxprot;
-	int8_t		padding[4];
+	uint32_t flags;
+	size_t size;
 };

 /*
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@ -166,7 +166,7 @@

 #define NOPHYS ((uintptr_t)-1)

-#define PROCESS_NUMA_MASK_BITS 64
+#define PROCESS_NUMA_MASK_BITS 256

 /*
 * Both the MPOL_* mempolicy mode and the MPOL_F_* optional mode flags are
@ -700,7 +700,8 @@ static inline int has_cap_sys_admin(struct thread *th)

 void hold_address_space(struct address_space *);
 void release_address_space(struct address_space *);
-struct thread *create_thread(unsigned long user_pc);
+struct thread *create_thread(unsigned long user_pc,
+		unsigned long *__cpu_set, size_t cpu_set_size);
 struct thread *clone_thread(struct thread *org, unsigned long pc,
                              unsigned long sp, int clone_flags);
 void destroy_thread(struct thread *thread);
--- a/kernel/include/syscall.h
+++ b/kernel/include/syscall.h
@ -149,6 +149,10 @@ struct program_image_section {
 #define MCK_RLIMIT_SIGPENDING	14
 #define MCK_RLIMIT_STACK	15

+#define PLD_CPU_SET_MAX_CPUS 1024
+typedef unsigned long __cpu_set_unit;
+#define PLD_CPU_SET_SIZE (PLD_CPU_SET_MAX_CPUS / (8 * sizeof(__cpu_set_unit)))
+
 struct program_load_desc {
 	int num_sections;
 	int status;
@ -178,6 +182,7 @@ struct program_load_desc {
 	struct rlimit rlimit[MCK_RLIM_MAX];
 	unsigned long interp_align;
 	char shell_path[SHELL_PATH_MAX_LEN];
+	__cpu_set_unit cpu_set[PLD_CPU_SET_SIZE];
 	struct program_image_section sections[0];
 };

@ -387,6 +392,7 @@ extern struct tod_data_s tod_data;	/* residing in arch-dependent file */

 void reset_cputime();
 void set_cputime(int mode);
+int do_munmap(void *addr, size_t len);
 intptr_t do_mmap(intptr_t addr0, size_t len0, int prot, int flags, int fd,
 		off_t off0);
 void clear_host_pte(uintptr_t addr, size_t len);
--- a/kernel/include/xpmem.h
+++ b/kernel/include/xpmem.h
@ -0,0 +1,21 @@
+/**
+ * \file xpmem.h
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  Structures and functions of xpmem
+ */
+/*
+ * HISTORY
+ */
+
+#ifndef _XPMEM_H
+#define _XPMEM_H
+
+#include <ihk/context.h>
+
+#define XPMEM_DEV_PATH  "/dev/xpmem"
+
+extern int xpmem_open(ihk_mc_user_context_t *ctx);
+
+#endif /* _XPMEM_H */
+
--- a/kernel/include/xpmem_private.h
+++ b/kernel/include/xpmem_private.h
@ -0,0 +1,388 @@
+/**
+ * \file xpmem_private.h
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  Private Cross Partition Memory (XPMEM) structures and macros.
+ */
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2007 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright 2009, 2010, 2014 Cray Inc. All Rights Reserved
+ * Copyright (c) 2014-2016 Los Alamos National Security, LCC. All rights
+ *                         reserved.
+ */
+/*
+ * HISTORY
+ */
+
+#ifndef _XPMEM_PRIVATE_H
+#define _XPMEM_PRIVATE_H
+
+#include <mc_xpmem.h>
+#include <xpmem.h>
+
+#define XPMEM_CURRENT_VERSION           0x00026003
+
+//#define DEBUG_PRINT_XPMEM
+
+#ifdef DEBUG_PRINT_XPMEM
+#define dkprintf(...) kprintf(__VA_ARGS__)
+#define ekprintf(...) kprintf(__VA_ARGS__)
+#define XPMEM_DEBUG(format, a...) kprintf("[%d] %s: "format"\n", cpu_local_var(current)->proc->rgid, __func__, ##a)
+#else
+#define dkprintf(...) do { if (0) kprintf(__VA_ARGS__); } while (0)
+#define ekprintf(...) kprintf(__VA_ARGS__)
+#define XPMEM_DEBUG(format, a...) do { if (0) kprintf("\n"); } while (0)
+#endif
+
+//#define USE_DBUG_ON
+
+#ifdef USE_DBUG_ON
+#define DBUG_ON(condition) do { if (condition) kprintf("[%d] BUG: func=%s\n", cpu_local_var(current)->proc->rgid, __func__); } while (0)
+#else
+#define DBUG_ON(condition)
+#endif
+
+#define offset_in_page(p)	((unsigned long)(p) & ~PAGE_MASK)
+
+#define min(x, y)	({                                              \
+	__typeof__(x) _min1 = (x);                                      \
+	__typeof__(y) _min2 = (y);                                      \
+	(void) (&_min1 == &_min2);                                      \
+	_min1 < _min2 ? _min1 : _min2;})
+
+#define max(x, y)	({                                              \
+	__typeof__(x) _max1 = (x);                                      \
+	__typeof__(y) _max2 = (y);                                      \
+	(void) (&_max1 == &_max2);                                      \
+	_max1 > _max2 ? _max1 : _max2;})
+
+#define MAX_ERRNO	4095
+
+#define IS_ERR_VALUE(x)	((x) >= (unsigned long)-MAX_ERRNO)
+
+static inline void * ERR_PTR(long error)
+{
+	return (void *)error;
+}
+
+static inline long PTR_ERR(const void *ptr)
+{
+	return (long)ptr;
+}
+
+static inline long IS_ERR(const void *ptr)
+{
+	return IS_ERR_VALUE((unsigned long)ptr);
+}
+
+static inline long IS_ERR_OR_NULL(const void *ptr)
+{
+	return !ptr || IS_ERR_VALUE((unsigned long)ptr);
+}
+
+/*
+ * Both the xpmem_segid_t and xpmem_apid_t are of type __s64 and designed
+ * to be opaque to the user. Both consist of the same underlying fields.
+ *
+ * The 'uniq' field is designed to give each segid or apid a unique value.
+ * Each type is only unique with respect to itself.
+ *
+ * An ID is never less than or equal to zero.
+ */
+struct xpmem_id {
+	pid_t tgid;		/* thread group that owns ID */
+	unsigned int uniq;	/* this value makes the ID unique */
+};
+
+typedef union {
+	struct xpmem_id xpmem_id;
+	xpmem_segid_t segid;
+	xpmem_apid_t apid;
+} xpmem_id_t;
+
+/* Shift INT_MAX by one so we can tell when we overflow. */
+#define XPMEM_MAX_UNIQ_ID	(INT_MAX >> 1)
+
+static inline pid_t xpmem_segid_to_tgid(xpmem_segid_t segid)
+{
+	DBUG_ON(segid <= 0);
+	return ((xpmem_id_t *)&segid)->xpmem_id.tgid;
+}
+
+static inline pid_t xpmem_apid_to_tgid(xpmem_apid_t apid)
+{
+	DBUG_ON(apid <= 0);
+	return ((xpmem_id_t *)&apid)->xpmem_id.tgid;
+}
+
+/*
+ * Hash Tables
+ *
+ * XPMEM utilizes hash tables to enable faster lookups of list entries.
+ * These hash tables are implemented as arrays. A simple modulus of the hash
+ * key yields the appropriate array index. A hash table's array element (i.e.,
+ * hash table bucket) consists of a hash list and the lock that protects it.
+ *
+ * XPMEM has the following two hash tables:
+ *
+ * table                bucket                                  key
+ * part->tg_hashtable   list of struct xpmem_thread_group       tgid
+ * tg->ap_hashtable     list of struct xpmem_access_permit      apid.uniq
+ */
+struct xpmem_hashlist {
+        mcs_rwlock_lock_t lock;	/* lock for hash list */
+        struct list_head list;	/* hash list */
+};
+
+#define XPMEM_TG_HASHTABLE_SIZE 8
+#define XPMEM_AP_HASHTABLE_SIZE 8
+
+static inline int xpmem_tg_hashtable_index(pid_t tgid)
+{
+	int index;
+
+	index = (unsigned int)tgid % XPMEM_TG_HASHTABLE_SIZE;
+
+	XPMEM_DEBUG("return: tgid=%lu, index=%d", tgid, index);
+
+	return index;
+}
+
+static inline int xpmem_ap_hashtable_index(xpmem_apid_t apid)
+{
+	int index;
+
+        DBUG_ON(apid <= 0);
+
+	index = ((xpmem_id_t *)&apid)->xpmem_id.uniq % XPMEM_AP_HASHTABLE_SIZE;
+
+	XPMEM_DEBUG("return: apid=%lu, index=%d", apid, index);
+
+	return index;
+}
+
+/*
+ * general internal driver structures
+ */
+struct xpmem_thread_group {
+	ihk_spinlock_t lock;	/* tg lock */
+	pid_t tgid;		/* tg's tgid */
+	uid_t uid;		/* tg's uid */
+	gid_t gid;		/* tg's gid */
+	volatile int flags;	/* tg attributes and state */
+	ihk_atomic_t uniq_segid;
+	ihk_atomic_t uniq_apid;
+	mcs_rwlock_lock_t seg_list_lock;
+	struct list_head seg_list;	/* tg's list of segs */
+	ihk_atomic_t refcnt;	/* references to tg */
+	ihk_atomic_t n_pinned;	/* #of pages pinned by this tg */
+	struct list_head tg_hashlist;	/* tg hash list */
+	struct thread *group_leader;	/* thread group leader */
+	struct process_vm *vm;		/* tg's mm */
+	ihk_atomic_t n_recall_PFNs;	/* #of recall of PFNs in progress */
+	struct xpmem_hashlist ap_hashtable[];	/* locks + ap hash lists */
+};
+
+struct xpmem_segment {
+	ihk_spinlock_t lock;	/* seg lock */
+	mcs_rwlock_lock_t seg_lock;	/* seg sema */
+	xpmem_segid_t segid;	/* unique segid */
+	unsigned long vaddr;	/* starting address */
+	size_t size;		/* size of seg */
+	int permit_type;	/* permission scheme */
+	void *permit_value;	/* permission data */
+	volatile int flags;	/* seg attributes and state */
+	ihk_atomic_t refcnt;	/* references to seg */
+	struct xpmem_thread_group *tg;	/* creator tg */
+	struct list_head ap_list;	/* local access permits of seg */
+	struct list_head seg_list;	/* tg's list of segs */
+};
+
+struct xpmem_access_permit {
+	ihk_spinlock_t lock;	/* access permit lock */
+	xpmem_apid_t apid;	/* unique apid */
+	int mode;		/* read/write mode */
+	volatile int flags;	/* access permit attributes and state */
+	ihk_atomic_t refcnt;	/* references to access permit */
+	struct xpmem_segment *seg;	/* seg permitted to be accessed */
+	struct xpmem_thread_group *tg;	/* access permit's tg */
+	struct list_head att_list;	/* atts of this access permit's seg */
+	struct list_head ap_list;	/* access permits linked to seg */
+	struct list_head ap_hashlist;	/* access permit hash list */
+};
+
+struct xpmem_attachment {
+	mcs_rwlock_lock_t at_lock;	/* att lock for serialization */
+	struct mcs_rwlock_node_irqsave at_irqsave;	/* att lock for serialization */
+	unsigned long vaddr;	/* starting address of seg attached */
+	unsigned long at_vaddr;	/* address where seg is attached */
+	size_t at_size;		/* size of seg attachment */
+	struct vm_range *at_vma;	/* vma where seg is attachment */
+	volatile int flags;	/* att attributes and state */
+	ihk_atomic_t refcnt;	/* references to att */
+	struct xpmem_access_permit *ap;	/* associated access permit */
+	struct list_head att_list;	/* atts linked to access permit */
+	struct process_vm *vm;	/* mm struct attached to */
+	mcs_rwlock_lock_t invalidate_lock;	/* to serialize page table invalidates */
+};
+
+struct xpmem_partition {
+	ihk_atomic_t n_opened;	/* # of /dev/xpmem opened */
+	struct xpmem_hashlist tg_hashtable[];	/* locks + tg hash lists */
+};
+
+#define XPMEM_FLAG_DESTROYING		0x00040 /* being destroyed */
+#define XPMEM_FLAG_DESTROYED		0x00080 /* 'being destroyed' finished */
+
+#define XPMEM_FLAG_VALIDPTEs		0x00200 /* valid PTEs exist */
+
+struct xpmem_perm {
+	uid_t uid;
+	gid_t gid;
+	unsigned long mode;
+};
+
+#define XPMEM_PERM_IRUSR 00400
+#define XPMEM_PERM_IWUSR 00200
+
+static int xpmem_ioctl(struct mckfd *mckfd, ihk_mc_user_context_t *ctx);
+static int xpmem_close( struct mckfd *mckfd, ihk_mc_user_context_t *ctx);
+
+static int xpmem_init(void);
+static void xpmem_exit(void);
+static int __xpmem_open(void);
+static void xpmem_destroy_tg(struct xpmem_thread_group *);
+
+static int xpmem_make(unsigned long, size_t, int, void *, xpmem_segid_t *);
+static xpmem_segid_t xpmem_make_segid(struct xpmem_thread_group *);
+
+static int xpmem_remove(xpmem_segid_t);
+static void xpmem_remove_seg(struct xpmem_thread_group *,
+        struct xpmem_segment *);
+
+static void xpmem_clear_PTEs(struct xpmem_segment *);
+
+extern struct xpmem_partition *xpmem_my_part;
+
+static struct xpmem_thread_group * __xpmem_tg_ref_by_tgid_nolock_internal(
+	pid_t, int, int);
+
+static inline struct xpmem_thread_group *__xpmem_tg_ref_by_tgid(
+	pid_t tgid,
+	int return_destroying)
+{
+	struct xpmem_thread_group *tg;
+	int index;
+	struct mcs_rwlock_node_irqsave lock;
+
+	XPMEM_DEBUG("call: tgid=%d, return_destroying=%d", 
+		tgid, return_destroying);
+
+	index = xpmem_tg_hashtable_index(tgid);
+	mcs_rwlock_reader_lock(&xpmem_my_part->tg_hashtable[index].lock, &lock);
+	tg = __xpmem_tg_ref_by_tgid_nolock_internal(tgid, index, 
+		return_destroying);
+        mcs_rwlock_reader_unlock(&xpmem_my_part->tg_hashtable[index].lock, 
+		&lock);
+
+	XPMEM_DEBUG("return: tg=0x%p", tg);
+
+        return tg;
+}
+
+static inline struct xpmem_thread_group *__xpmem_tg_ref_by_tgid_nolock(
+	pid_t tgid,
+	int return_destroying)
+{
+	struct xpmem_thread_group *tg;
+
+	XPMEM_DEBUG("call: tgid=%d, return_destroying=%d", 
+		tgid, return_destroying);
+
+        tg = __xpmem_tg_ref_by_tgid_nolock_internal(tgid, 
+		xpmem_tg_hashtable_index(tgid), return_destroying);
+
+	XPMEM_DEBUG("return: tg=0x%p", tg);
+
+        return tg;
+}
+
+#define xpmem_tg_ref_by_tgid(t)             __xpmem_tg_ref_by_tgid(t, 0)
+#define xpmem_tg_ref_by_tgid_all(t)         __xpmem_tg_ref_by_tgid(t, 1)
+#define xpmem_tg_ref_by_tgid_nolock(t)      __xpmem_tg_ref_by_tgid_nolock(t, 0)
+#define xpmem_tg_ref_by_tgid_all_nolock(t)  __xpmem_tg_ref_by_tgid_nolock(t, 1)
+
+static struct xpmem_thread_group * xpmem_tg_ref_by_segid(xpmem_segid_t);
+static void xpmem_tg_deref(struct xpmem_thread_group *);
+static struct xpmem_segment *xpmem_seg_ref_by_segid(struct xpmem_thread_group *,
+	xpmem_segid_t);
+static void xpmem_seg_deref(struct xpmem_segment *);
+
+/*
+ * Inlines that mark an internal driver structure as being destroyable or not.
+ * The idea is to set the refcnt to 1 at structure creation time and then
+ * drop that reference at the time the structure is to be destroyed.
+ */
+static inline void xpmem_tg_not_destroyable(
+	struct xpmem_thread_group *tg)
+{
+	ihk_atomic_set(&tg->refcnt, 1);
+
+	XPMEM_DEBUG("return: tg->refcnt=%d", tg->refcnt);
+}
+
+static inline void xpmem_tg_destroyable(
+	struct xpmem_thread_group *tg)
+{
+	XPMEM_DEBUG("call: ");
+
+	xpmem_tg_deref(tg);
+
+	XPMEM_DEBUG("return: ");
+}
+
+static inline void xpmem_seg_not_destroyable(
+	struct xpmem_segment *seg)
+{
+	ihk_atomic_set(&seg->refcnt, 1);
+
+	XPMEM_DEBUG("return: seg->refcnt=%d", seg->refcnt);
+}
+
+static inline void xpmem_seg_destroyable(
+	struct xpmem_segment *seg)
+{
+	XPMEM_DEBUG("call: ");
+
+	xpmem_seg_deref(seg);
+
+	XPMEM_DEBUG("return: ");
+}
+
+/*
+ * Inlines that increment the refcnt for the specified structure.
+ */
+static inline void xpmem_tg_ref(
+	struct xpmem_thread_group *tg)
+{
+	DBUG_ON(ihk_atomic_read(&tg->refcnt) <= 0);
+	ihk_atomic_inc(&tg->refcnt);
+
+	XPMEM_DEBUG("return: tg->refcnt=%d", tg->refcnt);
+}
+
+static inline void xpmem_seg_ref(
+	struct xpmem_segment *seg)
+{
+	DBUG_ON(ihk_atomic_read(&seg->refcnt) <= 0);
+	ihk_atomic_inc(&seg->refcnt);
+
+	XPMEM_DEBUG("return: seg->refcnt=%d", seg->refcnt);
+}
+
+#endif /* _XPMEM_PRIVATE_H */
+
--- a/kernel/init.c
+++ b/kernel/init.c
@ -108,11 +108,11 @@ static void dma_test(void)
 }
 #endif

-extern char *ihk_mc_get_kernel_args(void);
+extern char *ihk_get_kargs(void);

 char *find_command_line(char *name)
 {
-	char *cmdline = ihk_mc_get_kernel_args();
+	char *cmdline = ihk_get_kargs();

 	if (!cmdline) {
 		return NULL;
@ -122,7 +122,7 @@ char *find_command_line(char *name)

 static void parse_kargs(void)
 {
-	kprintf("KCommand Line: %s\n", ihk_mc_get_kernel_args());
+	kprintf("KCommand Line: %s\n", ihk_get_kargs());

 	if (1) {
 		char *key = "osnum=";
@ -254,7 +254,7 @@ static void rest_init(void)
 	time_init();
 	kmalloc_init();

-	ikc_master_init();
+	ihk_ikc_master_init();

 	proc_init();

@ -373,6 +373,7 @@ int main(void)

 	kputs("IHK/McKernel started.\n");

+	ihk_set_kmsg(virt_to_phys(&kmsg_buf), IHK_KMSG_SIZE);
 	arch_init();

 	/*
--- a/kernel/mem.c
+++ b/kernel/mem.c
@ -494,18 +494,96 @@ static void reserve_pages(struct ihk_page_allocator_desc *pa_allocator,
 	ihk_pagealloc_reserve(pa_allocator, start, end);
 }

-static void *allocate_aligned_pages(int npages, int p2align, 
+extern int cpu_local_var_initialized;
+static void *allocate_aligned_pages(int npages, int p2align,
 		enum ihk_mc_ap_flag flag)
 {
-	unsigned long pa;
-	int i;
+	unsigned long pa = 0;
+	int i, node;
+	struct ihk_page_allocator_desc *pa_allocator;
+
+	/* Not yet initialized or idle process */
+	if (!cpu_local_var_initialized ||
+			!cpu_local_var(current) ||
+			!cpu_local_var(current)->vm)
+		goto distance_based;
+
+	/* User requested policy? */
+	switch (cpu_local_var(current)->vm->numa_mem_policy) {
+		case MPOL_BIND:
+		case MPOL_PREFERRED:
+			for_each_set_bit(node,
+					cpu_local_var(current)->proc->vm->numa_mask,
+					ihk_mc_get_nr_numa_nodes()) {
+
+				list_for_each_entry(pa_allocator,
+						&memory_nodes[node].allocators, list) {
+					pa = ihk_pagealloc_alloc(pa_allocator, npages, p2align);
+
+					if (pa) {
+						dkprintf("%s: policy: CPU @ node %d allocated "
+								"%d pages from node %d\n",
+								__FUNCTION__,
+								ihk_mc_get_numa_id(),
+								npages, node);
+						break;
+					}
+				}
+
+				if (pa) break;
+			}
+			break;
+
+		case MPOL_INTERLEAVE:
+			/* TODO: */
+			break;
+
+		default:
+			break;
+	}
+
+	if (pa)
+		return phys_to_virt(pa);
+
+distance_based:
+	node = ihk_mc_get_numa_id();
+
+	/* Look at nodes in the order of distance */
+	if (!memory_nodes[node].nodes_by_distance)
+		goto order_based;

-	/* TODO: match NUMA id and distance matrix with allocating core */
 	for (i = 0; i < ihk_mc_get_nr_numa_nodes(); ++i) {
-		struct ihk_page_allocator_desc *pa_allocator;

 		list_for_each_entry(pa_allocator,
-				&memory_nodes[(ihk_mc_get_numa_id() + i) %
+				&memory_nodes[memory_nodes[node].
+				nodes_by_distance[i].id].allocators, list) {
+			pa = ihk_pagealloc_alloc(pa_allocator, npages, p2align);
+
+			if (pa) {
+				dkprintf("%s: distance: CPU @ node %d allocated "
+						"%d pages from node %d\n",
+						__FUNCTION__,
+						ihk_mc_get_numa_id(),
+						npages,
+						memory_nodes[node].nodes_by_distance[i].id);
+				break;
+			}
+		}
+
+		if (pa) break;
+	}
+
+	if (pa)
+		return phys_to_virt(pa);
+
+order_based:
+	node = ihk_mc_get_numa_id();
+
+	/* Fall back to regular order */
+	for (i = 0; i < ihk_mc_get_nr_numa_nodes(); ++i) {
+
+		list_for_each_entry(pa_allocator,
+				&memory_nodes[(node + i) %
 				ihk_mc_get_nr_numa_nodes()].allocators, list) {
 			pa = ihk_pagealloc_alloc(pa_allocator, npages, p2align);

@ -806,8 +884,8 @@ static void page_fault_handler(void *fault_addr, uint64_t reason, void *regs)
 	int error;

 	set_cputime(interrupt_from_user(regs)? 1: 2);
-	dkprintf("[%d]page_fault_handler(%p,%lx,%p)\n",
-			ihk_mc_get_processor_id(), fault_addr, reason, regs);
+	dkprintf("%s: addr: %p, reason: %lx, regs: %p\n",
+			__FUNCTION__, fault_addr, reason, regs);

 	preempt_disable();

@ -862,9 +940,8 @@ static void page_fault_handler(void *fault_addr, uint64_t reason, void *regs)
 	error = 0;
 	preempt_enable();
 out:
-	dkprintf("[%d]page_fault_handler(%p,%lx,%p): (%d)\n",
-			ihk_mc_get_processor_id(), fault_addr, reason,
-			regs, error);
+	dkprintf("%s: addr: %p, reason: %lx, regs: %p -> error: %d\n",
+			__FUNCTION__, fault_addr, reason, regs, error);
 	check_need_resched();
 	set_cputime(0);
 	return;
@ -932,6 +1009,7 @@ static void numa_init(void)
 		memory_nodes[i].linux_numa_id = linux_numa_id;
 		memory_nodes[i].type = type;
 		INIT_LIST_HEAD(&memory_nodes[i].allocators);
+		memory_nodes[i].nodes_by_distance = 0;

 		kprintf("NUMA: %d, Linux NUMA: %d, type: %d\n",
 			i, linux_numa_id, type);
@ -955,6 +1033,72 @@ static void numa_init(void)
 	}
 }

+static void numa_distances_init()
+{
+	int i, j, swapped;
+
+	for (i = 0; i < ihk_mc_get_nr_numa_nodes(); ++i) {
+		/* TODO: allocate on target node */
+		memory_nodes[i].nodes_by_distance =
+			ihk_mc_alloc_pages((sizeof(struct node_distance) *
+						ihk_mc_get_nr_numa_nodes() + PAGE_SIZE - 1)
+					>> PAGE_SHIFT, IHK_MC_AP_NOWAIT);
+
+		if (!memory_nodes[i].nodes_by_distance) {
+			kprintf("%s: error: allocating nodes_by_distance\n",
+				__FUNCTION__);
+			continue;
+		}
+
+		for (j = 0; j < ihk_mc_get_nr_numa_nodes(); ++j) {
+			memory_nodes[i].nodes_by_distance[j].id = j;
+			memory_nodes[i].nodes_by_distance[j].distance =
+				ihk_mc_get_numa_distance(i, j);
+		}
+
+		/* Sort by distance and node ID */
+		swapped = 1;
+		while (swapped) {
+			swapped = 0;
+			for (j = 1; j < ihk_mc_get_nr_numa_nodes(); ++j) {
+				if ((memory_nodes[i].nodes_by_distance[j - 1].distance >
+							memory_nodes[i].nodes_by_distance[j].distance) ||
+						((memory_nodes[i].nodes_by_distance[j - 1].distance ==
+						  memory_nodes[i].nodes_by_distance[j].distance) &&
+						 (memory_nodes[i].nodes_by_distance[j - 1].id >
+						  memory_nodes[i].nodes_by_distance[j].id))) {
+					memory_nodes[i].nodes_by_distance[j - 1].id ^=
+						memory_nodes[i].nodes_by_distance[j].id;
+					memory_nodes[i].nodes_by_distance[j].id ^=
+						memory_nodes[i].nodes_by_distance[j - 1].id;
+					memory_nodes[i].nodes_by_distance[j - 1].id ^=
+						memory_nodes[i].nodes_by_distance[j].id;
+
+					memory_nodes[i].nodes_by_distance[j - 1].distance ^=
+						memory_nodes[i].nodes_by_distance[j].distance;
+					memory_nodes[i].nodes_by_distance[j].distance ^=
+						memory_nodes[i].nodes_by_distance[j - 1].distance;
+					memory_nodes[i].nodes_by_distance[j - 1].distance ^=
+						memory_nodes[i].nodes_by_distance[j].distance;
+					swapped = 1;
+				}
+			}
+		}
+		{
+			char buf[1024];
+			char *pbuf = buf;
+
+			pbuf += sprintf(pbuf, "NUMA %d distances: ", i);
+			for (j = 0; j < ihk_mc_get_nr_numa_nodes(); ++j) {
+				pbuf += sprintf(pbuf, "%d (%d), ",
+						memory_nodes[i].nodes_by_distance[j].id,
+						memory_nodes[i].nodes_by_distance[j].distance);
+			}
+			kprintf("%s\n", buf);
+		}
+	}
+}
+
 #define PHYS_PAGE_HASH_SHIFT	(10)
 #define PHYS_PAGE_HASH_SIZE     (1 << PHYS_PAGE_HASH_SHIFT)
 #define PHYS_PAGE_HASH_MASK     (PHYS_PAGE_HASH_SIZE - 1)
@ -1236,6 +1380,9 @@ void mem_init(void)
 		kprintf("Demand paging on ANONYMOUS mappings enabled.\n");
 		anon_on_demand = 1;
 	}
+	
+	/* Init distance vectors */
+	numa_distances_init();
 }

 #define KMALLOC_TRACK_HASH_SHIFT	(8)
--- a/kernel/mikc.c
+++ b/kernel/mikc.c
@ -21,7 +21,7 @@ static struct ihk_ikc_channel_desc *mchannel;
 static int arch_master_channel_packet_handler(struct ihk_ikc_channel_desc *,
                                         void *__packet, void *arg);

-void ikc_master_init(void)
+void ihk_ikc_master_init(void)
 {
 	mchannel = kmalloc(sizeof(struct ihk_ikc_channel_desc) +
 	                   sizeof(struct ihk_ikc_master_packet),
--- a/kernel/process.c
+++ b/kernel/process.c
@ -233,13 +233,15 @@ init_process_vm(struct process *owner, struct address_space *asp, struct process
 	return 0;
 }

-struct thread *
-create_thread(unsigned long user_pc)
+struct thread *create_thread(unsigned long user_pc,
+		unsigned long *__cpu_set, size_t cpu_set_size)
 {
 	struct thread *thread;
 	struct process *proc;
 	struct process_vm *vm = NULL;
 	struct address_space *asp = NULL;
+	int cpu;
+	int cpu_set_empty = 1;

 	thread = ihk_mc_alloc_pages(KERNEL_STACK_NR_PAGES, IHK_MC_AP_NOWAIT);
 	if (!thread)
@ -255,7 +257,22 @@ create_thread(unsigned long user_pc)
 	memset(vm, 0, sizeof(struct process_vm));
 	init_process(proc, cpu_local_var(resource_set)->pid1);

-	if (1) {
+	/* Use requested CPU cores */
+	for_each_set_bit(cpu, __cpu_set, cpu_set_size * BITS_PER_BYTE) {
+		if (cpu >= num_processors) {
+			kprintf("%s: invalid CPU requested in initial cpu_set\n",
+				__FUNCTION__);
+			goto err;
+		}
+
+		dkprintf("%s: pid: %d, CPU: %d\n",
+			__FUNCTION__, proc->pid, cpu); 
+		CPU_SET(cpu, &thread->cpu_set);
+		cpu_set_empty = 0;
+	}
+
+	/* Default allows all cores */
+	if (cpu_set_empty) {
 		struct ihk_mc_cpu_info *infop;
 		int i;

@ -1367,6 +1384,11 @@ static int sync_one_page(void *arg0, page_table_t pt, pte_t *ptep,
 	flush_tlb_single((uintptr_t)pgaddr);	/* XXX: TLB flush */

 	phys = pte_get_phys(ptep);
+	if (args->memobj->flags & MF_ZEROFILL) {
+		error = 0;
+		goto out;
+	}
+
 	error = memobj_flush_page(args->memobj, phys, pgsize);
 	if (error) {
 		ekprintf("sync_one_page(%p,%p,%p %#lx,%p,%d):"
@ -1394,11 +1416,19 @@ int sync_process_memory_range(struct process_vm *vm, struct vm_range *range,
 	args.memobj = range->memobj;

 	ihk_mc_spinlock_lock_noirq(&vm->page_table_lock);
-	memobj_lock(range->memobj);
+
+	if (!(range->memobj->flags & MF_ZEROFILL)) {
+		memobj_lock(range->memobj);
+	}
+
 	error = visit_pte_range(vm->address_space->page_table, (void *)start,
-	                        (void *)end, range->pgshift, VPTEF_SKIP_NULL,
-				&sync_one_page, &args);
-	memobj_unlock(range->memobj);
+			(void *)end, range->pgshift, VPTEF_SKIP_NULL,
+			&sync_one_page, &args);
+
+	if (!(range->memobj->flags & MF_ZEROFILL)) {
+		memobj_unlock(range->memobj);
+	}
+
 	ihk_mc_spinlock_unlock_noirq(&vm->page_table_lock);
 	if (error) {
 		ekprintf("sync_process_memory_range(%p,%p,%#lx,%#lx):"
@ -2191,9 +2221,10 @@ int populate_process_memory(struct process_vm *vm, void *start, size_t len)
 	for (addr = (uintptr_t)start; addr < end; addr += PAGE_SIZE) {
 		error = page_fault_process_vm(vm, (void *)addr, reason);
 		if (error) {
-			ekprintf("populate_process_range:page_fault_process_vm"
-					"(%p,%lx,%lx) failed %d\n",
-					vm, addr, reason, error);
+			ekprintf("%s: WARNING: page_fault_process_vm(): vm: %p, "
+					"addr: %lx, reason: %lx, off: %lu, len: %lu returns %d\n",
+					__FUNCTION__, vm, addr, reason,
+					((void *)addr - start), len, error);
 			goto out;
 		}
 	}
--- a/kernel/shmobj.c
+++ b/kernel/shmobj.c
@ -179,6 +179,7 @@ int shmobj_create(struct shmid_ds *ds, struct memobj **objp)

 	memset(obj, 0, sizeof(*obj));
 	obj->memobj.ops = &shmobj_ops;
+	obj->memobj.size = ds->shm_segsz;
 	obj->ds = *ds;
 	obj->ds.shm_perm.seq = the_seq++;
 	obj->ds.shm_nattch = 1;
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@ -54,6 +54,7 @@
 #include <process.h>
 #include <bitops.h>
 #include <bitmap.h>
+#include <xpmem.h>

 /* Headers taken from kitten LWK */
 #include <lwk/stddef.h>
@ -1062,7 +1063,7 @@ out:
 	return (int)lerror;
 }

-static int do_munmap(void *addr, size_t len)
+int do_munmap(void *addr, size_t len)
 {
 	int error;
 	int ro_freed;
@ -1362,6 +1363,13 @@ do_mmap(const intptr_t addr0, const size_t len0, const int prot,
 		goto out;
 	}

+	memobj_lock(memobj);
+	if (memobj->status == MEMOBJ_TO_BE_PREFETCHED) {
+		memobj->status = MEMOBJ_READY;
+		populated_mapping = 1;
+	}
+	memobj_unlock(memobj);
+
 	error = 0;
 	p = NULL;
 	memobj = NULL;
@ -1376,8 +1384,9 @@ out:
 	if (!error && populated_mapping && !((vrflags & VR_PROT_MASK) == VR_PROT_NONE)) {
 		error = populate_process_memory(thread->vm, (void *)addr, len);
 		if (error) {
-			ekprintf("%s: error :populate_process_memory"
-					"vm: %p, addr: %p, len: %d (flags: %s%s) failed %d\n", __FUNCTION__,
+			ekprintf("%s: WARNING: populate_process_memory(): "
+					"vm: %p, addr: %p, len: %d (flags: %s%s) failed %d\n",
+					__FUNCTION__,
 					thread->vm, (void *)addr, len,
 					(flags & MAP_POPULATE) ? "MAP_POPULATE " : "",
 					(flags & MAP_LOCKED) ? "MAP_LOCKED ": "",
@ -1884,7 +1893,7 @@ SYSCALL_DECLARE(execve)
 	ret = do_syscall(&request, ihk_mc_get_processor_id(), 0);

 	if (ret != 0) {
-		kprintf("execve(): ERROR: host failed to load elf header, errno: %d\n", 
+		dkprintf("execve(): ERROR: host failed to load elf header, errno: %d\n", 
 				ret);
 		return -ret;
 	}
@ -2039,7 +2048,7 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
 		return -EINVAL;
 	}

-	cpuid = obtain_clone_cpuid();
+	cpuid = obtain_clone_cpuid(&old->cpu_set);
    if (cpuid == -1) {
 		kprintf("do_fork,core not available\n");
        return -EAGAIN;
@ -2696,6 +2705,21 @@ SYSCALL_DECLARE(ioctl)
 	return rc;
 }

+SYSCALL_DECLARE(open)
+{
+	const char *pathname = (const char *)ihk_mc_syscall_arg0(ctx);
+	long rc;
+
+	dkprintf("open(): pathname=%s\n", pathname);
+	if (!strcmp(pathname, XPMEM_DEV_PATH)) {
+		rc = xpmem_open(ctx);
+	} else {
+		rc = syscall_generic_forwarding(__NR_open, ctx);
+	}
+
+	return rc;
+}
+
 SYSCALL_DECLARE(close)
 {
 	int fd = ihk_mc_syscall_arg0(ctx);
@ -7400,7 +7424,9 @@ SYSCALL_DECLARE(mbind)
 			}

 			/* Verify NUMA mask */
-			for_each_set_bit(bit, numa_mask, maxnode) {
+			for_each_set_bit(bit, numa_mask,
+					maxnode < PROCESS_NUMA_MASK_BITS ?
+					maxnode : PROCESS_NUMA_MASK_BITS) {
 				if (bit >= ihk_mc_get_nr_numa_nodes()) {
 					dkprintf("%s: %d is bigger than # of NUMA nodes\n",
 						__FUNCTION__, bit);
@ -7703,7 +7729,9 @@ SYSCALL_DECLARE(set_mempolicy)

 			/* Verify NUMA mask */
 			valid_mask = 0;
-			for_each_set_bit(bit, numa_mask, maxnode) {
+			for_each_set_bit(bit, numa_mask,
+					maxnode < PROCESS_NUMA_MASK_BITS ?
+					maxnode : PROCESS_NUMA_MASK_BITS) {
 				if (bit >= ihk_mc_get_nr_numa_nodes()) {
 					dkprintf("%s: %d is bigger than # of NUMA nodes\n",
 						__FUNCTION__, bit);
@ -7725,7 +7753,9 @@ SYSCALL_DECLARE(set_mempolicy)
 			}

 			/* Update current mask by clearing non-requested nodes */
-			for_each_set_bit(bit, vm->numa_mask, maxnode) {
+			for_each_set_bit(bit, vm->numa_mask,
+					maxnode < PROCESS_NUMA_MASK_BITS ?
+					maxnode : PROCESS_NUMA_MASK_BITS) {
 				if (!test_bit(bit, numa_mask)) {
 					clear_bit(bit, vm->numa_mask);
 				}
--- a/kernel/xpmem.c
+++ b/kernel/xpmem.c
@ -0,0 +1,739 @@
+/**
+ * \file xpmem.c
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  Cross Partition Memory (XPMEM) support.
+ */
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2007 Silicon Graphics, Inc.  All Rights Reserved.
+ * Copyright 2010, 2014 Cray Inc. All Rights Reserved
+ * Copyright 2015-2016 Los Alamos National Security, LLC. All rights reserved.
+ */
+/*
+ * HISTORY
+ */
+
+#include <errno.h>
+#include <kmalloc.h>
+#include <limits.h>
+#include <memobj.h>
+#include <mman.h>
+#include <string.h>
+#include <types.h>
+#include <vsprintf.h>
+#include <ihk/lock.h>
+#include <ihk/mm.h>
+#include <xpmem_private.h>
+
+
+struct xpmem_partition *xpmem_my_part = NULL;  /* pointer to this partition */
+
+
+int xpmem_open(
+	ihk_mc_user_context_t *ctx)
+{
+	const char *pathname = (const char *)ihk_mc_syscall_arg0(ctx);
+	int flags = (int)ihk_mc_syscall_arg1(ctx);
+	int ret;
+	struct thread *thread = cpu_local_var(current);
+	struct process *proc = thread->proc;
+	struct syscall_request request IHK_DMA_ALIGN;
+	int fd;
+	struct mckfd *mckfd;
+	long irqstate;
+
+	XPMEM_DEBUG("call: pathname=%s, flags=%d", pathname, flags);
+
+	if (!xpmem_my_part) {
+		ret = xpmem_init();
+		if (ret) {
+			return ret;
+		}
+	}
+
+	request.number = __NR_open;
+	request.args[0] = (unsigned long)pathname;
+	request.args[1] = flags;
+	fd = do_syscall(&request, ihk_mc_get_processor_id(), 0);
+	if(fd < 0){
+		XPMEM_DEBUG("__NR_open error: fd=%d", fd);
+		return fd;
+	}
+
+	ret = __xpmem_open();
+	if (ret) {
+		XPMEM_DEBUG("return: ret=%d", ret);
+		return ret;
+	}
+
+	mckfd = kmalloc(sizeof(struct mckfd), IHK_MC_AP_NOWAIT);
+	if(!mckfd) {
+		return -ENOMEM;
+	}
+	XPMEM_DEBUG("kmalloc(): mckfd=0x%p", mckfd);
+	memset(mckfd, 0, sizeof(struct mckfd));
+	mckfd->fd = fd;
+	mckfd->sig_no = -1;
+	mckfd->ioctl_cb = xpmem_ioctl;
+	mckfd->close_cb = xpmem_close;
+	irqstate = ihk_mc_spinlock_lock(&proc->mckfd_lock);
+
+	if(proc->mckfd == NULL) {
+		proc->mckfd = mckfd;
+		mckfd->next = NULL;
+	} else {
+		mckfd->next = proc->mckfd;
+		proc->mckfd = mckfd;
+	}
+
+	ihk_mc_spinlock_unlock(&proc->mckfd_lock, irqstate);
+
+	ihk_atomic_inc_return(&xpmem_my_part->n_opened);
+
+	XPMEM_DEBUG("return: ret=%d", mckfd->fd);
+
+	return mckfd->fd;
+}
+
+
+static int xpmem_ioctl(
+	struct mckfd *mckfd,
+	ihk_mc_user_context_t *ctx)
+{
+	int ret;
+	unsigned int cmd = ihk_mc_syscall_arg1(ctx);
+	unsigned long arg = ihk_mc_syscall_arg2(ctx);
+
+	XPMEM_DEBUG("call: cmd=0x%x, arg=0x%lx", cmd, arg);
+
+	switch (cmd) {
+	case XPMEM_CMD_VERSION: {
+		ret = XPMEM_CURRENT_VERSION;
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=0x%lx", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_MAKE: {
+		struct xpmem_cmd_make make_info;
+		xpmem_segid_t segid = 0;
+
+		if (copy_from_user(&make_info, (void __user *)arg, 
+			sizeof(struct xpmem_cmd_make)))
+			return -EFAULT;
+
+		ret = xpmem_make(make_info.vaddr, make_info.size, 
+			make_info.permit_type, 
+			(void *)make_info.permit_value, &segid);
+		if (ret != 0) {
+			XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+			return ret;
+		}
+
+		if (copy_to_user(&((struct xpmem_cmd_make __user *)arg)->segid, 
+			(void *)&segid, sizeof(xpmem_segid_t))) {
+			(void)xpmem_remove(segid);
+			return -EFAULT;
+		}
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_REMOVE: {
+		struct xpmem_cmd_remove remove_info;
+
+		if (copy_from_user(&remove_info, (void __user *)arg, 
+			sizeof(struct xpmem_cmd_remove)))
+			return -EFAULT;
+
+		ret = xpmem_remove(remove_info.segid);
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_GET: {
+		struct xpmem_cmd_get get_info;
+//		xpmem_apid_t apid = 0;
+
+		if (copy_from_user(&get_info, (void __user *)arg, 
+			sizeof(struct xpmem_cmd_get)))
+			return -EFAULT;
+
+//		ret = xpmem_get(get_info.segid, get_info.flags,
+//			get_info.permit_type,
+//			(void *)get_info.permit_value, &apid); // TODO
+		ret = -EINVAL;
+		if (ret != 0) {
+			XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+			return ret;
+		}
+
+//		if (copy_to_user(&((struct xpmem_cmd_get __user *)arg)->apid, 
+//			(void *)&apid, sizeof(xpmem_apid_t))) {
+//			(void)xpmem_release(apid);
+//			return -EFAULT;
+//		}
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_RELEASE: {
+		struct xpmem_cmd_release release_info;
+
+		if (copy_from_user(&release_info, (void __user *)arg,
+			sizeof(struct xpmem_cmd_release)))
+			return -EFAULT;
+
+//		ret = xpmem_release(release_info.apid); // TODO
+		ret = -EINVAL;
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_ATTACH: {
+		struct xpmem_cmd_attach attach_info;
+//		unsigned long at_vaddr = 0;
+
+		if (copy_from_user(&attach_info, (void __user *)arg, 
+			sizeof(struct xpmem_cmd_attach)))
+			return -EFAULT;
+
+//		ret = xpmem_attach(mckfd, attach_info.apid, attach_info.offset, 
+//			attach_info.size, attach_info.vaddr, 
+//			attach_info.fd, attach_info.flags, 
+//			&at_vaddr); // TODO
+		ret = -EINVAL;
+		if (ret != 0) {
+			XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+			return ret;
+		}
+
+//		if (copy_to_user(
+//			&((struct xpmem_cmd_attach __user *)arg)->vaddr, 
+//			(void *)&at_vaddr, sizeof(unsigned long))) {
+//			(void)xpmem_detach(at_vaddr);
+//			return -EFAULT;
+//		}
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	case XPMEM_CMD_DETACH: {
+		struct xpmem_cmd_detach detach_info;
+
+		if (copy_from_user(&detach_info, (void __user *)arg, 
+			sizeof(struct xpmem_cmd_detach)))
+			return -EFAULT;
+
+//		ret = xpmem_detach(detach_info.vaddr); // TODO
+		ret = -EINVAL;
+
+		XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, ret);
+
+		return ret;
+	}
+	default:
+		break;
+	}
+
+	XPMEM_DEBUG("return: cmd=0x%x, ret=%d", cmd, -EINVAL);
+
+	return -EINVAL;
+}
+
+
+static int xpmem_close(
+	struct mckfd *mckfd,
+	ihk_mc_user_context_t *ctx)
+{
+	struct xpmem_thread_group *tg;
+	int index;
+	struct mcs_rwlock_node_irqsave lock;
+	int n_opened;
+
+	XPMEM_DEBUG("call: fd=%d", mckfd->fd);
+
+	n_opened = ihk_atomic_dec_return(&xpmem_my_part->n_opened);
+	if (n_opened) {
+		XPMEM_DEBUG("return: ret=%d, n_opened=%d", 0, n_opened);
+		return 0;
+	}
+	XPMEM_DEBUG("n_opened=%d", n_opened);
+
+	index = xpmem_tg_hashtable_index(cpu_local_var(current)->proc->pid);
+
+	mcs_rwlock_writer_lock(&xpmem_my_part->tg_hashtable[index].lock, &lock);
+
+	tg = xpmem_tg_ref_by_tgid_all_nolock(
+		cpu_local_var(current)->proc->pid);
+	if (!tg) {
+		mcs_rwlock_writer_unlock(
+			&xpmem_my_part->tg_hashtable[index].lock, &lock);
+		return 0;
+	}
+
+	list_del_init(&tg->tg_hashlist);
+
+	mcs_rwlock_writer_unlock(&xpmem_my_part->tg_hashtable[index].lock, 
+		&lock);
+
+	XPMEM_DEBUG("tg->vm=0x%p", tg->vm);
+
+	xpmem_destroy_tg(tg);
+
+	if (!n_opened) {
+		xpmem_exit();
+	}
+
+	XPMEM_DEBUG("return: ret=%d", 0);
+
+	return 0;
+}
+
+
+static int xpmem_init(void)
+{
+	int i;
+
+	XPMEM_DEBUG("call: ");
+
+	xpmem_my_part = kmalloc(sizeof(struct xpmem_partition) + 
+		sizeof(struct xpmem_hashlist) * XPMEM_TG_HASHTABLE_SIZE, 
+		IHK_MC_AP_NOWAIT);
+	if (xpmem_my_part == NULL) {
+		return -ENOMEM;
+	}
+	XPMEM_DEBUG("kmalloc(): xpmem_my_part=0x%p", xpmem_my_part);
+	memset(xpmem_my_part, 0, sizeof(struct xpmem_partition) + 
+		sizeof(struct xpmem_hashlist) * XPMEM_TG_HASHTABLE_SIZE);
+
+	for (i = 0; i < XPMEM_TG_HASHTABLE_SIZE; i++) {
+		mcs_rwlock_init(&xpmem_my_part->tg_hashtable[i].lock);
+		INIT_LIST_HEAD(&xpmem_my_part->tg_hashtable[i].list);
+	}
+
+	ihk_atomic_set(&xpmem_my_part->n_opened, 0);
+
+	XPMEM_DEBUG("return: ret=%d", 0);
+
+	return 0;
+}
+
+
+static void xpmem_exit(void)
+{
+	XPMEM_DEBUG("call: ");
+
+	if (xpmem_my_part) {
+		XPMEM_DEBUG("kfree(): 0x%p", xpmem_my_part);
+		kfree(xpmem_my_part);
+		xpmem_my_part = NULL;
+	}
+
+	XPMEM_DEBUG("return: ");
+}
+
+
+static int __xpmem_open(void)
+{
+	struct xpmem_thread_group *tg;
+	int index;
+	struct mcs_rwlock_node_irqsave lock;
+
+	XPMEM_DEBUG("call: ");
+
+	tg = xpmem_tg_ref_by_tgid(cpu_local_var(current)->proc->pid);
+	if (!IS_ERR(tg)) {
+		xpmem_tg_deref(tg);
+		XPMEM_DEBUG("return: ret=%d, tg=0x%p", 0, tg);
+		return 0;
+	}
+
+	tg = kmalloc(sizeof(struct xpmem_thread_group) + 
+		sizeof(struct xpmem_hashlist) * XPMEM_AP_HASHTABLE_SIZE, 
+		IHK_MC_AP_NOWAIT);
+	if (tg == NULL) {
+		return -ENOMEM;
+	}
+	XPMEM_DEBUG("kmalloc(): tg=0x%p", tg);
+	memset(tg, 0, sizeof(struct xpmem_thread_group) + 
+		sizeof(struct xpmem_hashlist) * XPMEM_AP_HASHTABLE_SIZE);
+
+	ihk_mc_spinlock_init(&tg->lock);
+	tg->tgid = cpu_local_var(current)->proc->pid;
+	tg->uid = cpu_local_var(current)->proc->ruid;
+	tg->gid = cpu_local_var(current)->proc->rgid;
+	ihk_atomic_set(&tg->uniq_segid, 0);
+	ihk_atomic_set(&tg->uniq_apid, 0);
+	mcs_rwlock_init(&tg->seg_list_lock);
+	INIT_LIST_HEAD(&tg->seg_list);
+	ihk_atomic_set(&tg->n_pinned, 0);
+	INIT_LIST_HEAD(&tg->tg_hashlist);
+	tg->vm = cpu_local_var(current)->vm;
+	ihk_atomic_set(&tg->n_recall_PFNs, 0);
+
+	for (index = 0; index < XPMEM_AP_HASHTABLE_SIZE; index++) {
+		mcs_rwlock_init(&tg->ap_hashtable[index].lock);
+		INIT_LIST_HEAD(&tg->ap_hashtable[index].list);
+	}
+
+	xpmem_tg_not_destroyable(tg);
+
+	index = xpmem_tg_hashtable_index(tg->tgid);
+	mcs_rwlock_writer_lock(&xpmem_my_part->tg_hashtable[index].lock, &lock);
+
+	list_add_tail(&tg->tg_hashlist, 
+		&xpmem_my_part->tg_hashtable[index].list);
+
+	mcs_rwlock_writer_unlock(&xpmem_my_part->tg_hashtable[index].lock, 
+		&lock);
+
+	tg->group_leader = cpu_local_var(current);
+
+	XPMEM_DEBUG("return: ret=%d", 0);
+
+	return 0;
+}
+
+
+static void xpmem_destroy_tg(
+	struct xpmem_thread_group *tg)
+{
+	XPMEM_DEBUG("call: tg=0x%p", tg);
+
+	XPMEM_DEBUG("tg->vm=0x%p", tg->vm);
+
+	xpmem_tg_destroyable(tg);
+	xpmem_tg_deref(tg);
+
+	XPMEM_DEBUG("return: ");
+}
+
+
+static int xpmem_make(
+	unsigned long vaddr,
+	size_t size,
+	int permit_type,
+	void *permit_value,
+	xpmem_segid_t *segid_p)
+{
+	xpmem_segid_t segid;
+	struct xpmem_thread_group *seg_tg;
+	struct xpmem_segment *seg;
+	struct mcs_rwlock_node_irqsave lock;
+
+	XPMEM_DEBUG("call: vaddr=0x%lx, size=%lu, permit_type=%d, " 
+		"permit_value=0%04lo", 
+		vaddr, size, permit_type, 
+		(unsigned long)(uintptr_t)permit_value);
+
+	if (permit_type != XPMEM_PERMIT_MODE ||
+		((unsigned long)(uintptr_t)permit_value & ~00777) || 
+		size == 0) {
+		XPMEM_DEBUG("return: ret=%d", -EINVAL);
+		return -EINVAL;
+	}
+
+	seg_tg = xpmem_tg_ref_by_tgid(cpu_local_var(current)->proc->pid);
+	if (IS_ERR(seg_tg)) {
+		DBUG_ON(PTR_ERR(seg_tg) != -ENOENT);
+		return -XPMEM_ERRNO_NOPROC;
+	}
+
+	/*
+	 * The start of the segment must be page aligned and it must be a
+	 * multiple of pages in size.
+	 */
+	if (offset_in_page(vaddr) != 0 || offset_in_page(size) != 0) {
+		xpmem_tg_deref(seg_tg);
+		XPMEM_DEBUG("return: ret=%d", -EINVAL);
+		return -EINVAL;
+	}
+
+	segid = xpmem_make_segid(seg_tg);
+	if (segid < 0) {
+		xpmem_tg_deref(seg_tg);
+		return segid;
+	}
+
+	/* create a new struct xpmem_segment structure with a unique segid */
+	seg = kmalloc(sizeof(struct xpmem_segment), IHK_MC_AP_NOWAIT);
+	if (seg == NULL) {
+		xpmem_tg_deref(seg_tg);
+		return -ENOMEM;
+	}
+	XPMEM_DEBUG("kmalloc(): seg=0x%p", seg);
+	memset(seg, 0, sizeof(struct xpmem_segment));
+
+	ihk_mc_spinlock_init(&seg->lock);
+	mcs_rwlock_init(&seg->seg_lock);
+	seg->segid = segid;
+	seg->vaddr = vaddr;
+	seg->size = size;
+	seg->permit_type = permit_type;
+	seg->permit_value = permit_value;
+	seg->tg = seg_tg;
+	INIT_LIST_HEAD(&seg->ap_list);
+	INIT_LIST_HEAD(&seg->seg_list);
+
+	xpmem_seg_not_destroyable(seg);
+
+	/* add seg to its tg's list of segs */
+	mcs_rwlock_writer_lock(&seg_tg->seg_list_lock, &lock);
+	list_add_tail(&seg->seg_list, &seg_tg->seg_list);
+	mcs_rwlock_writer_unlock(&seg_tg->seg_list_lock, &lock);
+
+	xpmem_tg_deref(seg_tg);
+
+	*segid_p = segid;
+
+	XPMEM_DEBUG("return: ret=%d, segid=0x%lx", 0, *segid_p);
+
+	return 0;
+}
+
+
+static xpmem_segid_t xpmem_make_segid(
+	struct xpmem_thread_group *seg_tg)
+{
+	struct xpmem_id segid;
+	xpmem_segid_t *segid_p = (xpmem_segid_t *)&segid;
+	int uniq;
+
+	XPMEM_DEBUG("call: seg_tg=0x%p, uniq_segid=%d", 
+		seg_tg, ihk_atomic_read(&seg_tg->uniq_segid));
+
+	DBUG_ON(sizeof(struct xpmem_id) != sizeof(xpmem_segid_t));
+
+	uniq = ihk_atomic_inc_return(&seg_tg->uniq_segid);
+	if (uniq > XPMEM_MAX_UNIQ_ID) {
+		ihk_atomic_dec(&seg_tg->uniq_segid);
+		return -EBUSY;
+	}
+
+	*segid_p = 0;
+	segid.tgid = seg_tg->tgid;
+	segid.uniq = (unsigned long)uniq;
+
+	DBUG_ON(*segid_p <= 0);
+
+	XPMEM_DEBUG("return: segid=0x%lx, segid.tgid=%d, segid.uniq=%d", 
+		segid, segid.tgid, segid.uniq);
+
+	return *segid_p;
+}
+
+
+static int xpmem_remove(
+	xpmem_segid_t segid)
+{
+	struct xpmem_thread_group *seg_tg;
+	struct xpmem_segment *seg;
+
+	XPMEM_DEBUG("call: segid=0x%lx", segid);
+
+	if (segid <= 0) {
+		XPMEM_DEBUG("return: ret=%d", -EINVAL);
+		return -EINVAL;
+	}
+
+	seg_tg = xpmem_tg_ref_by_segid(segid);
+	if (IS_ERR(seg_tg))
+		return PTR_ERR(seg_tg);
+
+	if (cpu_local_var(current)->proc->pid != seg_tg->tgid) {
+		xpmem_tg_deref(seg_tg);
+		XPMEM_DEBUG("return: ret=%d", -EACCES);
+		return -EACCES;
+	}
+
+	seg = xpmem_seg_ref_by_segid(seg_tg, segid);
+	if (IS_ERR(seg)) {
+		xpmem_tg_deref(seg_tg);
+		return PTR_ERR(seg);
+	}
+	DBUG_ON(seg->tg != seg_tg);
+
+	xpmem_remove_seg(seg_tg, seg);
+	xpmem_seg_deref(seg);
+	xpmem_tg_deref(seg_tg);
+
+	XPMEM_DEBUG("return: ret=%d", 0);
+
+	return 0;
+}
+
+
+static void xpmem_remove_seg(
+	struct xpmem_thread_group *seg_tg,
+	struct xpmem_segment *seg)
+{
+	DBUG_ON(ihk_atomic_read(&seg->refcnt) <= 0);
+	struct mcs_rwlock_node_irqsave seg_lock;
+	struct mcs_rwlock_node_irqsave lock;
+
+	XPMEM_DEBUG("call: tgid=%d, segid=0x%lx", seg_tg->tgid, seg->segid);
+
+	ihk_mc_spinlock_lock(&seg->lock);
+	if (seg->flags & XPMEM_FLAG_DESTROYING) {
+		ihk_mc_spinlock_unlock_noirq(&seg->lock);
+		schedule();
+		return;
+	}
+	seg->flags |= XPMEM_FLAG_DESTROYING;
+	ihk_mc_spinlock_unlock_noirq(&seg->lock);
+
+	mcs_rwlock_writer_lock(&seg->seg_lock, &seg_lock);
+
+	/* unpin pages and clear PTEs for each attachment to this segment */
+	xpmem_clear_PTEs(seg);
+
+	/* indicate that the segment has been destroyed */
+	ihk_mc_spinlock_lock(&seg->lock);
+	seg->flags |= XPMEM_FLAG_DESTROYED;
+	ihk_mc_spinlock_unlock_noirq(&seg->lock);
+
+	/* Remove segment structure from its tg's list of segs */
+	mcs_rwlock_writer_lock(&seg_tg->seg_list_lock, &lock);
+	list_del_init(&seg->seg_list);
+	mcs_rwlock_writer_unlock(&seg_tg->seg_list_lock, &lock);
+
+	mcs_rwlock_writer_unlock(&seg->seg_lock, &seg_lock);
+
+	xpmem_seg_destroyable(seg);
+
+	XPMEM_DEBUG("return: ");
+}
+
+
+static void xpmem_clear_PTEs(
+	struct xpmem_segment *seg)
+{
+	XPMEM_DEBUG("call: seg=0x%p", seg);
+
+//	xpmem_clear_PTEs_range(seg, seg->vaddr, seg->vaddr + seg->size, 0); // TODO
+
+	XPMEM_DEBUG("return: ");
+}
+
+
+static struct xpmem_thread_group * __xpmem_tg_ref_by_tgid_nolock_internal(
+	pid_t tgid,
+	int index,
+	int return_destroying)
+{
+	struct xpmem_thread_group *tg;
+
+	XPMEM_DEBUG("call: tgid=%d, index=%d, return_destroying=%d", 
+		tgid, index, return_destroying);
+
+	list_for_each_entry(tg, &xpmem_my_part->tg_hashtable[index].list,
+		tg_hashlist) {
+		if (tg->tgid == tgid) {
+			if ((tg->flags & XPMEM_FLAG_DESTROYING) &&
+				!return_destroying) {
+				continue;
+			}
+
+			xpmem_tg_ref(tg);
+
+			XPMEM_DEBUG("return: tg=0x%p", tg);
+			return tg;
+		}
+	}
+
+	XPMEM_DEBUG("return: tg=0x%p", ERR_PTR(-ENOENT));
+
+	return ERR_PTR(-ENOENT);
+}
+
+
+static struct xpmem_thread_group * xpmem_tg_ref_by_segid(
+	xpmem_segid_t segid)
+{
+	struct xpmem_thread_group *tg;
+
+	XPMEM_DEBUG("call: segid=0x%lx", segid);
+
+	tg = xpmem_tg_ref_by_tgid(xpmem_segid_to_tgid(segid));
+
+	XPMEM_DEBUG("return: tg=0x%p", tg);
+
+        return tg;
+}
+
+
+static void xpmem_tg_deref(
+	struct xpmem_thread_group *tg)
+{
+	XPMEM_DEBUG("call: tg=0x%p", tg);
+
+	DBUG_ON(ihk_atomic_read(&tg->refcnt) <= 0);
+	if (ihk_atomic_dec_return(&tg->refcnt) != 0) {
+		XPMEM_DEBUG("return: tg->refcnt=%d", tg->refcnt);
+		return;
+	}
+
+	XPMEM_DEBUG("kfree(): tg=0x%p", tg);
+	kfree(tg);
+
+	XPMEM_DEBUG("return: ");
+}
+
+
+static struct xpmem_segment * xpmem_seg_ref_by_segid(
+	struct xpmem_thread_group *seg_tg,
+	xpmem_segid_t segid)
+{
+	struct xpmem_segment *seg;
+	struct mcs_rwlock_node_irqsave lock;
+
+	XPMEM_DEBUG("call: seg_tg=0x%p, segid=0x%lx", seg_tg, segid);
+
+	mcs_rwlock_reader_lock(&seg_tg->seg_list_lock, &lock);
+
+	list_for_each_entry(seg, &seg_tg->seg_list, seg_list) {
+		if (seg->segid == segid) {
+			if (seg->flags & XPMEM_FLAG_DESTROYING)
+				continue;
+
+			xpmem_seg_ref(seg);
+			mcs_rwlock_reader_unlock(&seg_tg->seg_list_lock, &lock);
+			return seg;
+		}
+	}
+
+	mcs_rwlock_reader_unlock(&seg_tg->seg_list_lock, &lock);
+
+	return ERR_PTR(-ENOENT);
+}
+
+
+static void xpmem_seg_deref(
+	struct xpmem_segment *seg)
+{
+	XPMEM_DEBUG("call: seg=0x%p", seg);
+
+	DBUG_ON(ihk_atomic_read(&seg->refcnt) <= 0);
+	if (ihk_atomic_dec_return(&seg->refcnt) != 0) {
+		XPMEM_DEBUG("return: seg->refcnt=%d", seg->refcnt);
+		return;
+	}
+
+	DBUG_ON(!(seg->flags & XPMEM_FLAG_DESTROYING));
+
+	XPMEM_DEBUG("kfree(): seg=0x%p", seg);
+	kfree(seg);
+
+	XPMEM_DEBUG("return: ");
+}
+
--- a/kernel/zeroobj.c
+++ b/kernel/zeroobj.c
@ -102,6 +102,7 @@ static int alloc_zeroobj(void)

 	memset(obj, 0, sizeof(*obj));
 	obj->memobj.ops = &zeroobj_ops;
+	obj->memobj.size = 0;
 	page_list_init(obj);
 	ihk_mc_spinlock_init(&obj->memobj.lock);

--- a/lib/include/ihk/cpu.h
+++ b/lib/include/ihk/cpu.h
@ -49,6 +49,7 @@ struct ihk_mc_cpu_info {
 	int ncpus;
 	int *hw_ids;
 	int *nodes;
+	int *linux_cpu_ids;
 };

 struct ihk_mc_cpu_info *ihk_mc_get_cpu_info(void);
@ -56,6 +57,9 @@ void ihk_mc_boot_cpu(int cpuid, unsigned long pc);
 int ihk_mc_get_processor_id(void);
 int ihk_mc_get_hardware_processor_id(void);
 int ihk_mc_get_numa_id(void);
+int ihk_mc_get_nr_cores();
+int ihk_mc_get_core(int id, unsigned long *linux_core_id, unsigned long *apic_id,
+                    int *numa_id);

 void ihk_mc_delay_us(int us);
 void ihk_mc_set_syscall_handler(long (*handler)(int, ihk_mc_user_context_t *));
--- a/lib/include/ihk/mm.h
+++ b/lib/include/ihk/mm.h
@ -185,6 +185,9 @@ int ihk_mc_get_memory_chunk(int id,
 void remote_flush_tlb_cpumask(struct process_vm *vm, 
 		unsigned long addr, int cpu_id);

+int ihk_set_kmsg(unsigned long addr, unsigned long size);
+char *ihk_get_kargs();
+
 extern void (*__tlb_flush_handler)(int vector);

 struct tlb_flush_entry {
--- a/lib/include/ihk/page_alloc.h
+++ b/lib/include/ihk/page_alloc.h
@ -17,11 +17,17 @@
 #include <list.h>

 /* XXX: Physical memory management shouldn't be part of IHK */
+struct node_distance {
+	int id;
+	int distance;
+};
+
 struct ihk_mc_numa_node {
 	int id;
 	int linux_numa_id;
 	int type;
 	struct list_head allocators;
+	struct node_distance *nodes_by_distance;
 };

 struct ihk_page_allocator_desc {
@ -30,7 +36,7 @@ struct ihk_page_allocator_desc {
 	unsigned int count;
 	unsigned int flag;
 	unsigned int shift;
-	ihk_spinlock_t lock;
+	mcs_lock_node_t lock;
 	struct list_head list;
 	
 	unsigned long map[0];
--- a/lib/include/mc_xpmem.h
+++ b/lib/include/mc_xpmem.h
@ -0,0 +1,153 @@
+/**
+ * \file mc_xpmem.h
+ *  License details are found in the file LICENSE.
+ * \brief
+ *  Cross Partition Memory (XPMEM) structures and macros.
+ */
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2004-2007 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+/*
+ * HISTORY
+ */
+
+#ifndef _MC_XPMEM_H
+#define _MC_XPMEM_H
+
+#ifndef __KERNEL__
+#include <sys/types.h>
+#endif
+
+/*
+ * _IOC definitions for McKernel
+ */
+#define _IOC_NRBITS	8
+#define _IOC_TYPEBITS	8
+
+#define _IOC_SIZEBITS	14
+
+#define _IOC_DIRBITS	2
+
+#define _IOC_NRSHIFT	0
+#define _IOC_TYPESHIFT	(_IOC_NRSHIFT+_IOC_NRBITS)
+#define _IOC_SIZESHIFT	(_IOC_TYPESHIFT+_IOC_TYPEBITS)
+#define _IOC_DIRSHIFT	(_IOC_SIZESHIFT+_IOC_SIZEBITS)
+
+#define _IOC_NONE	0U
+
+#define _IOC(dir,type,nr,size) \
+	(((dir)  << _IOC_DIRSHIFT) | \
+	 ((type) << _IOC_TYPESHIFT) | \
+	 ((nr)   << _IOC_NRSHIFT) | \
+	 ((size) << _IOC_SIZESHIFT))
+
+#define _IO(type,nr) _IOC(_IOC_NONE,(type),(nr),0)
+
+/*
+ * basic argument type definitions for McKernel
+ */
+typedef uint64_t u64;
+typedef uint64_t __u64;
+typedef int64_t __s64;
+
+/*
+ * basic argument type definitions
+ */
+typedef __s64 xpmem_segid_t;	/* segid returned from xpmem_make() */
+typedef __s64 xpmem_apid_t;	/* apid returned from xpmem_get() */
+
+struct xpmem_addr {
+	xpmem_apid_t apid;	/* apid that represents memory */
+	off_t offset;		/* offset into apid's memory */
+};
+
+#define XPMEM_MAXADDR_SIZE	(size_t)(-1L)
+
+/*
+ * path to XPMEM device
+ */
+#define XPMEM_DEV_PATH  "/dev/xpmem"
+
+/*
+ * The following are the possible XPMEM related errors.
+ */
+#define XPMEM_ERRNO_NOPROC	2004	/* unknown thread due to fork() */
+
+/*
+ * flags for segment permissions
+ */
+#define XPMEM_RDONLY	0x1
+#define XPMEM_RDWR	0x2
+
+/*
+ * Valid permit_type values for xpmem_make().
+ */
+#define XPMEM_PERMIT_MODE	0x1
+
+/*
+ * ioctl() commands used to interface to the kernel module.
+ */
+#define XPMEM_IOC_MAGIC		'x'
+#define XPMEM_CMD_VERSION	_IO(XPMEM_IOC_MAGIC, 0)
+#define XPMEM_CMD_MAKE		_IO(XPMEM_IOC_MAGIC, 1)
+#define XPMEM_CMD_REMOVE	_IO(XPMEM_IOC_MAGIC, 2)
+#define XPMEM_CMD_GET		_IO(XPMEM_IOC_MAGIC, 3)
+#define XPMEM_CMD_RELEASE	_IO(XPMEM_IOC_MAGIC, 4)
+#define XPMEM_CMD_ATTACH	_IO(XPMEM_IOC_MAGIC, 5)
+#define XPMEM_CMD_DETACH	_IO(XPMEM_IOC_MAGIC, 6)
+
+/*
+ * Structures used with the preceding ioctl() commands to pass data.
+ */
+struct xpmem_cmd_make {
+	__u64 vaddr;
+	size_t size;
+	int permit_type;
+	__u64 permit_value;
+	xpmem_segid_t segid;	/* returned on success */
+};
+
+struct xpmem_cmd_remove {
+	xpmem_segid_t segid;
+};
+
+struct xpmem_cmd_get {
+	xpmem_segid_t segid;
+	int flags;
+	int permit_type;
+	__u64 permit_value;
+	xpmem_apid_t apid;	/* returned on success */
+};
+
+struct xpmem_cmd_release {
+	xpmem_apid_t apid;
+};
+
+struct xpmem_cmd_attach {
+	xpmem_apid_t apid;
+	off_t offset;
+	size_t size;
+	__u64 vaddr;
+	int fd;
+	int flags;
+};
+
+struct xpmem_cmd_detach {
+	__u64 vaddr;
+};
+
+#ifndef __KERNEL__
+extern int xpmem_version(void);
+extern xpmem_segid_t xpmem_make(void *, size_t, int, void *);
+extern int xpmem_remove(xpmem_segid_t);
+extern xpmem_apid_t xpmem_get(xpmem_segid_t, int, int, void *);
+extern int xpmem_release(xpmem_apid_t);
+extern void *xpmem_attach(struct xpmem_addr, size_t, void *);
+extern int xpmem_detach(void *);
+#endif
+
+#endif /* _MC_XPMEM_H */
--- a/lib/page_alloc.c
+++ b/lib/page_alloc.c
@ -73,7 +73,7 @@ void *__ihk_pagealloc_init(unsigned long start, unsigned long size,
 	//kprintf("page allocator @ %lx - %lx (%d)\n", start, start + size,
 	//        page_shift);

-	ihk_mc_spinlock_init(&desc->lock);
+	mcs_lock_init(&desc->lock);

 	/* Reserve align padding area */
 	for (i = mapsize; i < mapaligned * 8; i++) {
@ -99,12 +99,12 @@ void ihk_pagealloc_destroy(void *__desc)
 static unsigned long __ihk_pagealloc_large(struct ihk_page_allocator_desc *desc,
                                           int npages, int p2align)
 {
-	unsigned long flags;
 	unsigned int i, j, mi;
 	int nblocks;
 	int nfrags;
 	unsigned long mask;
-	int mialign;
+	unsigned long align_mask = ((PAGE_SIZE << p2align) - 1);
+	mcs_lock_node_t node;

 	nblocks = (npages / 64);
 	mask = -1;
@ -113,14 +113,13 @@ static unsigned long __ihk_pagealloc_large(struct ihk_page_allocator_desc *desc,
 		++nblocks;
 		mask = (1UL << nfrags) - 1;
 	}
-	mialign = (p2align <= 6)? 1: (1 << (p2align - 6));

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	for (i = 0, mi = desc->last; i < desc->count; i++, mi++) {
 		if (mi >= desc->count) {
 			mi = 0;
 		}
-		if ((mi + nblocks >= desc->count) || (mi % mialign)) {
+		if ((mi + nblocks >= desc->count) || (ADDRESS(desc, mi, 0) & align_mask)) {
 			continue;
 		}
 		for (j = mi; j < mi + nblocks - 1; j++) {
@ -133,11 +132,11 @@ static unsigned long __ihk_pagealloc_large(struct ihk_page_allocator_desc *desc,
 				desc->map[j] = (unsigned long)-1;
 			}
 			desc->map[j] |= mask;
-			ihk_mc_spinlock_unlock(&desc->lock, flags);
+			mcs_lock_unlock(&desc->lock, &node);
 			return ADDRESS(desc, mi, 0);
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);

 	return 0;
 }
@ -147,8 +146,9 @@ unsigned long ihk_pagealloc_alloc(void *__desc, int npages, int p2align)
 	struct ihk_page_allocator_desc *desc = __desc;
 	unsigned int i, mi;
 	int j;
-	unsigned long v, mask, flags;
+	unsigned long v, mask;
 	int jalign;
+	mcs_lock_node_t node;

 	if ((npages >= 32) || (p2align >= 5)) {
 		return __ihk_pagealloc_large(desc, npages, p2align);
@ -157,7 +157,7 @@ unsigned long ihk_pagealloc_alloc(void *__desc, int npages, int p2align)
 	mask = (1UL << npages) - 1;
 	jalign = (p2align <= 0)? 1: (1 << p2align);

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	for (i = 0, mi = desc->last; i < desc->count; i++, mi++) {
 		if (mi >= desc->count) {
 			mi = 0;
@ -174,12 +174,12 @@ unsigned long ihk_pagealloc_alloc(void *__desc, int npages, int p2align)
 			if (!(v & (mask << j))) { /* free */
 				desc->map[mi] |= (mask << j);

-				ihk_mc_spinlock_unlock(&desc->lock, flags);
+				mcs_lock_unlock(&desc->lock, &node);
 				return ADDRESS(desc, mi, j);
 			}
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);

 	/* We use null pointer for failure */
 	return 0;
@ -189,7 +189,7 @@ void ihk_pagealloc_reserve(void *__desc, unsigned long start, unsigned long end)
 {
 	int i, n;
 	struct ihk_page_allocator_desc *desc = __desc;
-	unsigned long flags;
+	mcs_lock_node_t node;

 	n = (end + (1 << desc->shift) - 1 - desc->start) >> desc->shift;
 	i = ((start - desc->start) >> desc->shift);
@ -197,7 +197,7 @@ void ihk_pagealloc_reserve(void *__desc, unsigned long start, unsigned long end)
 		return;
 	}

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	for (; i < n; i++) {
 		if (!(i & 63) && i + 63 < n) {
 			desc->map[MAP_INDEX(i)] = (unsigned long)-1L;
@ -206,7 +206,7 @@ void ihk_pagealloc_reserve(void *__desc, unsigned long start, unsigned long end)
 			desc->map[MAP_INDEX(i)] |= (1UL << MAP_BIT(i));
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);
 }

 void ihk_pagealloc_free(void *__desc, unsigned long address, int npages)
@ -214,24 +214,24 @@ void ihk_pagealloc_free(void *__desc, unsigned long address, int npages)
 	struct ihk_page_allocator_desc *desc = __desc;
 	int i;
 	unsigned mi;
-	unsigned long flags;
+	mcs_lock_node_t node;

 	/* XXX: Parameter check */
-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	mi = (address - desc->start) >> desc->shift;
 	for (i = 0; i < npages; i++, mi++) {
 		desc->map[MAP_INDEX(mi)] &= ~(1UL << MAP_BIT(mi));
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);
 }

 unsigned long ihk_pagealloc_count(void *__desc)
 {
 	struct ihk_page_allocator_desc *desc = __desc;
 	unsigned long i, j, n = 0;
-	unsigned long flags;
+	mcs_lock_node_t node;

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	/* XXX: Very silly counting */
 	for (i = 0; i < desc->count; i++) {
 		for (j = 0; j < 64; j++) {
@ -240,7 +240,7 @@ unsigned long ihk_pagealloc_count(void *__desc)
 			}
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);
 	
 	return n;
 }
@ -250,10 +250,11 @@ int ihk_pagealloc_query_free(void *__desc)
 	struct ihk_page_allocator_desc *desc = __desc;
 	unsigned int mi;
 	int j;
-	unsigned long v, flags;
+	unsigned long v;
 	int npages = 0;
+	mcs_lock_node_t node;

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	for (mi = 0; mi < desc->count; mi++) {
 		
 		v = desc->map[mi];
@ -266,7 +267,7 @@ int ihk_pagealloc_query_free(void *__desc)
 			}
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);

 	return npages;
 }
@ -276,11 +277,12 @@ void __ihk_pagealloc_zero_free_pages(void *__desc)
 	struct ihk_page_allocator_desc *desc = __desc;
 	unsigned int mi;
 	int j;
-	unsigned long v, flags;
+	unsigned long v;
+	mcs_lock_node_t node;

 kprintf("zeroing free memory... ");

-	flags = ihk_mc_spinlock_lock(&desc->lock);
+	mcs_lock_lock(&desc->lock, &node);
 	for (mi = 0; mi < desc->count; mi++) {
 		
 		v = desc->map[mi];
@ -294,7 +296,7 @@ kprintf("zeroing free memory... ");
 			}
 		}
 	}
-	ihk_mc_spinlock_unlock(&desc->lock, flags);
+	mcs_lock_unlock(&desc->lock, &node);

 kprintf("\nzeroing done\n");
 }
Author	SHA1	Message	Date
Balazs Gerofi	f81927b85b	Revert "brk(): larger allocation units internally" This reverts commit `c58ab0f648`.	2016-12-20 11:11:09 +09:00
Balazs Gerofi	701cdcdab1	use MCS locks in physical memory allocator	2016-12-19 12:57:59 +09:00
Balazs Gerofi	9635a628a9	fileobj/shmobj/devobj: add file size to memobj	2016-12-19 12:55:12 +09:00
Balazs Gerofi	3e1b16f3fc	syscall_channel: increase queue size to avoid deadlock in ikc_send()	2016-12-18 21:12:38 +09:00
Balazs Gerofi	ff37ff9ccf	memobj: synch prefetch among processes	2016-12-18 21:12:38 +09:00
Balazs Gerofi	5b7bcb7170	fileobj: use read/write MCS locks in page hash	2016-12-18 21:12:37 +09:00
Balazs Gerofi	6a5fe90f98	mcexec_get_cpuset(): save CPU set and IKC target cpu in per-process data	2016-12-18 21:12:37 +09:00
Balazs Gerofi	91373337ba	mcctrl: add IKC target CPU to OS file release_handler	2016-12-18 21:12:37 +09:00
Balazs Gerofi	56ed726a88	pager_req_create(): prefetch for MPI library and zerofill for shm	2016-12-18 21:12:37 +09:00
Balazs Gerofi	bce10e11e4	fileobj: rewrite for scalability using per-file page hash	2016-12-18 21:12:37 +09:00
Balazs Gerofi	91cdb16158	MCS lock: separate IRQ disable/enable versions	2016-12-18 21:12:37 +09:00
Balazs Gerofi	c58ab0f648	brk(): larger allocation units internally	2016-12-18 21:12:37 +09:00
Yoichi Umezawa	f410af1cfc	xpmem: porting xpmem v2.6.3 implement xpmem_make, xpmem_remove	2016-12-16 17:00:09 +09:00
Balazs Gerofi	aa15e5eea8	mcexec: -t option and OMP_NUM_THREADS for thread pool size	2016-12-14 18:56:30 +09:00
Balazs Gerofi	df9f1f8f78	allocate_aligned_pages(): take user set NUMA policy into account	2016-12-13 17:51:39 +09:00
Balazs Gerofi	7ace35d737	mcexec_get_cpuset(): fix NUMA search bug	2016-12-13 17:50:50 +09:00
Balazs Gerofi	551999ff6b	NUMA: order nodes based on distances	2016-12-13 10:46:17 +09:00
Balazs Gerofi	052b3f44ca	mcexec: -n: topology aware partitioned execution	2016-12-10 16:27:57 +09:00
Balazs Gerofi	fdcf766337	prepare_process(): pass cpu_set in program_load_desc	2016-12-09 16:32:20 +09:00
Balazs Gerofi	7d13bfb14e	set_mempolicy(): limit maxnode to PROCESS_NUMA_MASK_BITS	2016-12-08 21:05:10 +09:00
Ken Sato	202bfd9955	IHK-API: expand and fix for ver 1.2.	2016-12-08 17:28:53 +09:00
Balazs Gerofi	c99e36235b	execve(): disable debug warnings	2016-12-08 16:33:24 +09:00
Balazs Gerofi	3cecafac59	obtain_clone_cpuid(): respect parent's CPU set	2016-12-08 16:01:30 +09:00
Balazs Gerofi	61fc4c5e55	show_context_stack(): fix warning	2016-12-07 11:42:09 +09:00
Balazs Gerofi	fad73cacc1	x86: display call stack for IRQ 133 (for debug)	2016-12-07 11:32:02 +09:00
Balazs Gerofi	8fced29978	page_fault_handler(): improved debug msg format	2016-12-07 11:25:02 +09:00
Balazs Gerofi	b0f4ae4890	ihk_mc_pt_set_pte(): double check phys address alignment	2016-12-07 11:23:45 +09:00
Balazs Gerofi	7070094a31	ihk_mc_pt_print_pte(): handle large pages correctly	2016-12-07 11:13:53 +09:00
Balazs Gerofi	011185e3f7	__ihk_pagealloc_large(): fix 1GB page alignment bug	2016-12-07 09:38:37 +09:00
Balazs Gerofi	461881e46a	/proc/mckernel to indicate McKernel	2016-12-06 14:29:25 +09:00