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wait: Delay wake-up parent within switch context

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Fujitsu: POSTK_DEBUG_TEMP_FIX_41
Refs: #1006
Change-Id: Ia98e896505ad0f6549766604ade84550eee8bd2d
This commit is contained in:
Ken Sato
2018-08-29 14:30:32 +09:00
committed by Masamichi Takagi
parent 0fdeb254b3
commit f57b0c5d4f
10 changed files with 280 additions and 43 deletions
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23
arch/x86_64/kernel/cpu.c
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@@ -1647,6 +1647,7 @@ int ihk_mc_interrupt_cpu(int cpu, int vector)
struct thread *arch_switch_context(struct thread *prev, struct thread *next)
{
struct thread *last;
struct mcs_rwlock_node_irqsave lock;
dkprintf("[%d] schedule: tlsblock_base: 0x%lX\n",
ihk_mc_get_processor_id(), next->tlsblock_base);
@@ -1677,6 +1678,28 @@ struct thread *arch_switch_context(struct thread *prev, struct thread *next)
#endif
if (prev) {
mcs_rwlock_writer_lock(&prev->proc->update_lock, &lock);
if (prev->proc->status & (PS_DELAY_STOPPED | PS_DELAY_TRACED)) {
switch (prev->proc->status) {
case PS_DELAY_STOPPED:
prev->proc->status = PS_STOPPED;
break;
case PS_DELAY_TRACED:
prev->proc->status = PS_TRACED;
break;
default:
break;
}
mcs_rwlock_writer_unlock(&prev->proc->update_lock,
&lock);
/* Wake up the parent who tried wait4 and sleeping */
waitq_wakeup(&prev->proc->parent->waitpid_q);
} else {
mcs_rwlock_writer_unlock(&prev->proc->update_lock,
&lock);
}
last = ihk_mc_switch_context(&prev->ctx, &next->ctx, prev);
}
else {