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simple_lmk: Don't queue up new reclaim requests during reclaim

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Queuing up reclaim requests while a reclaim is in progress doesn't make
sense, since the additional reclaims may not be needed after the
existing reclaim completes. This would cause Simple LMK to go berserk
during periods of high memory pressure where kswapd would fire off
reclaim requests nonstop.

Make Simple LMK ignore new reclaim requests until an existing reclaim is
finished to prevent a slaughter-fest.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: azrim <mirzaspc@gmail.com>
This commit is contained in:
Sultan Alsawaf 2020-01-20 16:03:44 -08:00 committed by azrim
parent 7e86f1e61f
commit e2cb78a57e
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GPG Key ID: 497F8FB059B45D1C
1 changed files with 5 additions and 13 deletions
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18
drivers/android/simple_lmk.c
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@ -245,8 +245,9 @@ static int simple_lmk_reclaim_thread(void *data)
sched_setscheduler_nocheck(current, SCHED_FIFO, &sched_max_rt_prio);
while (1) {
wait_event(oom_waitq, atomic_add_unless(&needs_reclaim, -1, 0));
wait_event(oom_waitq, atomic_read_acquire(&needs_reclaim));
scan_and_kill(MIN_FREE_PAGES);
atomic_set_release(&needs_reclaim, 0);
}
return 0;
@ -254,18 +255,9 @@ static int simple_lmk_reclaim_thread(void *data)
void simple_lmk_decide_reclaim(int kswapd_priority)
{
if (kswapd_priority == CONFIG_ANDROID_SIMPLE_LMK_AGGRESSION) {
int v, v1;
for (v = 0;; v = v1) {
v1 = atomic_cmpxchg(&needs_reclaim, v, v + 1);
if (likely(v1 == v)) {
if (!v)
wake_up(&oom_waitq);
break;
}
}
}
if (kswapd_priority == CONFIG_ANDROID_SIMPLE_LMK_AGGRESSION &&
!atomic_cmpxchg(&needs_reclaim, 0, 1))
wake_up(&oom_waitq);
}
void simple_lmk_mm_freed(struct mm_struct *mm)