gh0s7/mckernel
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

memset_smp(): parallel memset

Browse Source
This commit is contained in:
Balazs Gerofi
2017-07-07 16:26:53 +09:00
parent 8426cf589a
commit 4c6c66555e
1 changed files with 63 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

64
kernel/process.c
View File

@ -1042,6 +1042,58 @@ enum ihk_mc_pt_attribute common_vrflag_to_ptattr(unsigned long flag, uint64_t fa
return attr;
}
/* Parallel memset implementation on top of general
* SMP funcution call facility */
struct memset_smp_req {
unsigned long phys;
size_t len;
int val;
};
int memset_smp_handler(int cpu_index, int nr_cpus, void *arg)
{
struct memset_smp_req *req =
(struct memset_smp_req *)arg;
size_t len = req->len / nr_cpus;
if (!len) {
/* First core clears all */
if (!cpu_index) {
memset((void *)phys_to_virt(req->phys), req->val, req->len);
}
}
else {
/* Divide and clear */
unsigned long p_s = req->phys + (cpu_index * len);
unsigned long p_e = p_s + len;
if (cpu_index == nr_cpus - 1) {
p_e = req->phys + req->len;
}
memset((void *)phys_to_virt(p_s), req->val, p_e - p_s);
dkprintf("%s: cpu_index: %d, nr_cpus: %d, phys: 0x%lx, "
"len: %lu, p_s: 0x%lx, p_e: 0x%lx\n",
__FUNCTION__, cpu_index, nr_cpus,
req->phys, req->len,
p_s, p_e);
}
return 0;
}
void *memset_smp(cpu_set_t *cpu_set, void *s, int c, size_t n)
{
struct memset_smp_req req = {
.phys = virt_to_phys(s),
.len = n,
.val = c,
};
smp_call_func(cpu_set, memset_smp_handler, &req);
return NULL;
}
int add_process_memory_range(struct process_vm *vm,
unsigned long start, unsigned long end,
unsigned long phys, unsigned long flag,
@ -1108,7 +1160,17 @@ int add_process_memory_range(struct process_vm *vm,
/* Clear content! */
if (!(flag & (VR_REMOTE | VR_DEMAND_PAGING))
&& ((flag & VR_PROT_MASK) != VR_PROT_NONE)) {
memset((void*)phys_to_virt(phys), 0, end - start);
#if 1
memset((void*)phys_to_virt(phys), 0, end - start);
#else
if (end - start < (1024*1024)) {
memset((void*)phys_to_virt(phys), 0, end - start);
}
else {
memset_smp(&cpu_local_var(current)->cpu_set,
(void *)phys_to_virt(phys), 0, end - start);
}
#endif
}
/* Return range object if requested */