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epoll/epoll_wait/ppoll: special handling in syscall offload

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Change-Id: I792eb91c349d0ce942179996328c6f89f186ba31
This commit is contained in:
Balazs Gerofi
2021-03-09 16:48:22 +09:00
committed by Masamichi Takagi
parent e3493bd0be
commit d5c5023bf8
1 changed files with 19 additions and 1 deletions
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20
kernel/syscall.c
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@ -246,6 +246,12 @@ long do_syscall(struct syscall_request *req, int cpu)
unsigned long flags;
DECLARE_WAITQ_ENTRY(scd_wq_entry, cpu_local_var(current));
#ifdef ENABLE_FUGAKU_HACKS
if (req->number == __NR_epoll_wait ||
req->number == __NR_epoll_pwait)
goto schedule;
#endif
if (thread->rpf_backlog) {
void (*func)(void *) = thread->rpf_backlog;
void *arg = thread->rpf_arg;
@ -287,6 +293,9 @@ long do_syscall(struct syscall_request *req, int cpu)
continue;
}
#ifdef ENABLE_FUGAKU_HACKS
schedule:
#endif
flags = cpu_disable_interrupt_save();
/* Try to sleep until notified */
@ -11149,7 +11158,16 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
}
#endif // PROFILE_ENABLE
if (smp_load_acquire(&v->flags) & CPU_FLAG_NEED_RESCHED) {
#ifdef ENABLE_FUGAKU_HACKS
/* Do not deschedule when returning from an event (e.g., MPI) */
if (!(num == __NR_epoll_wait ||
num == __NR_epoll_pwait ||
num == __NR_ppoll) &&
smp_load_acquire(&v->flags) & CPU_FLAG_NEED_RESCHED)
#else
if (smp_load_acquire(&v->flags) & CPU_FLAG_NEED_RESCHED)
#endif
{
check_need_resched();
}