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sched_yield(): optionally disable wait

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This commit is contained in:
Balazs Gerofi
2017-01-08 14:13:12 +09:00
parent d8170e292c
commit a18fd1f45c
1 changed files with 17 additions and 6 deletions
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23
kernel/syscall.c
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@ -6669,15 +6669,18 @@ SYSCALL_DECLARE(nanosleep)
return do_syscall(&request, ihk_mc_get_processor_id(), 0);
}
//#define DISABLE_SCHED_YIELD
SYSCALL_DECLARE(sched_yield)
{
struct cpu_local_var *v;
int do_schedule = 0;
long runq_irqstate;
struct cpu_local_var *v = get_this_cpu_local_var();
runq_irqstate =
ihk_mc_spinlock_lock(&(get_this_cpu_local_var()->runq_lock));
v = get_this_cpu_local_var();
#ifdef DISABLE_SCHED_YIELD
return 0;
#endif
runq_irqstate = ihk_mc_spinlock_lock(&v->runq_lock);
if (v->flags & CPU_FLAG_NEED_RESCHED || v->runq_len > 1) {
do_schedule = 1;
@ -8653,7 +8656,11 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
#endif // TRACK_SYSCALLS
struct thread *thread = cpu_local_var(current);
set_cputime(1);
#ifdef DISABLE_SCHED_YIELD
if (num != __NR_sched_yield)
#endif // DISABLE_SCHED_YIELD
set_cputime(1);
if(cpu_local_var(current)->proc->status == PS_EXITED &&
(num != __NR_exit && num != __NR_exit_group)){
check_signal(-EINVAL, NULL, 0);
@ -8745,6 +8752,10 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
ptrace_syscall_exit(cpu_local_var(current));
}
set_cputime(0);
#ifdef DISABLE_SCHED_YIELD
if (num != __NR_sched_yield)
#endif // DISABLE_SCHED_YIELD
set_cputime(0);
return l;
}