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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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6
arch/arm64/kernel/cpu.c
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@ -1306,9 +1306,7 @@ struct thread *arch_switch_context(struct thread *prev, struct thread *next)
extern void perf_start(struct mc_perf_event *event);
extern void perf_reset(struct mc_perf_event *event);
struct thread *last;
#ifdef POSTK_DEBUG_TEMP_FIX_41 /* early to wait4() wakeup for ptrace, fix. */
struct mcs_rwlock_node_irqsave lock;
#endif /* POSTK_DEBUG_TEMP_FIX_41 */
/* Set up new TLS.. */
dkprintf("[%d] arch_switch_context: tlsblock_base: 0x%lX\n",
@ -1328,7 +1326,6 @@ struct thread *arch_switch_context(struct thread *prev, struct thread *next)
if (likely(prev)) {
tls_thread_switch(prev, next);
#ifdef POSTK_DEBUG_TEMP_FIX_41 /* early to wait4() wakeup for ptrace, fix. */
mcs_rwlock_writer_lock(&prev->proc->update_lock, &lock);
if (prev->proc->status & (PS_DELAY_STOPPED | PS_DELAY_TRACED)) {
switch (prev->proc->status) {
@ -1342,11 +1339,12 @@ struct thread *arch_switch_context(struct thread *prev, struct thread *next)
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);
}
#endif /* POSTK_DEBUG_TEMP_FIX_41 */
last = ihk_mc_switch_context(&prev->ctx, &next->ctx, prev);
}