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clv: Change no_preempt from int to ihk_atomic_t.

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Fix the issue where the value of no_preempt gets unexpected value
(-1, 1, 2 etc.) after process ends when running the UTI tests.

Change-Id: I7d9c08b754a171ea3fdec20ab2e635df3b607cbd
This commit is contained in:
Shiratori, Takehiro
2019-03-08 20:55:58 +09:00
committed by Masamichi Takagi
parent 1070387ed2
commit eba2131f34
5 changed files with 14 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
kernel/cls.c
View File

@ -66,15 +66,15 @@ void preempt_enable(void)
{
#ifndef ENABLE_FUGAKU_HACKS
if (cpu_local_var_initialized)
--cpu_local_var(no_preempt);
ihk_atomic_dec(&cpu_local_var(no_preempt));
#else
if (cpu_local_var_initialized) {
--cpu_local_var(no_preempt);
ihk_atomic_dec(&cpu_local_var(no_preempt));
if (cpu_local_var(no_preempt) < 0) {
if (ihk_atomic_read(&cpu_local_var(no_preempt)) < 0) {
//cpu_disable_interrupt();
__kprintf("%s: %d\n", __func__, cpu_local_var(no_preempt));
__kprintf("%s: %d\n", __func__, ihk_atomic_read(&cpu_local_var(no_preempt)));
__kprintf("TID: %d, call stack from builtin frame (most recent first):\n",
cpu_local_var(current)->tid);
__show_context_stack(cpu_local_var(current), (uintptr_t)&preempt_enable,
@ -93,7 +93,7 @@ void preempt_enable(void)
void preempt_disable(void)
{
if (cpu_local_var_initialized) {
++cpu_local_var(no_preempt);
ihk_atomic_inc(&cpu_local_var(no_preempt));
}
}

2
kernel/include/cls.h
View File

@ -107,7 +107,7 @@ struct cpu_local_var {
struct list_head migq;
int in_interrupt;
int in_page_fault;
int no_preempt;
ihk_atomic_t no_preempt;
int timer_enabled;
unsigned long nr_ctx_switches;
int kmalloc_initialized;

4
kernel/include/kmalloc.h
View File

@ -20,7 +20,9 @@
#define kmalloc(size, flag) ({\
void *r = _kmalloc(size, flag, __FILE__, __LINE__);\
if (r == NULL) {\
kprintf("kmalloc: out of memory %s:%d no_preempt=%d\n", __FILE__, __LINE__, cpu_local_var(no_preempt)); \
kprintf("kmalloc: out of memory %s:%d no_preempt=%d\n", \
__FILE__, __LINE__, \
ihk_atomic_read(&cpu_local_var(no_preempt))); \
}\
r;\
})

4
kernel/process.c
View File

@ -3726,9 +3726,9 @@ void schedule(void)
int prevpid;
unsigned long irqstate = 0;
if (cpu_local_var(no_preempt)) {
if (ihk_atomic_read(&cpu_local_var(no_preempt))) {
kprintf("%s: WARNING can't schedule() while no preemption, cnt: %d\n",
__func__, cpu_local_var(no_preempt));
__func__, ihk_atomic_read(&cpu_local_var(no_preempt)));
irqstate = cpu_disable_interrupt_save();
ihk_mc_spinlock_lock_noirq(

3
kernel/syscall.c
View File

@ -260,7 +260,8 @@ long do_syscall(struct syscall_request *req, int cpu)
cpu_pause();
/* Spin if not preemptable */
if (cpu_local_var(no_preempt) || !thread->tid) {
if (ihk_atomic_read(&cpu_local_var(no_preempt))
|| !thread->tid) {
continue;
}