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Perform all accesses to uma_reclaim_needed using atomic(9) KPI.

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Reviewed by:	alc, jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D13534
This commit is contained in:
Konstantin Belousov 2017-12-19 10:06:55 +00:00
parent 6f697994fd
commit 200f8117ba
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=326974
1 changed files with 2 additions and 2 deletions
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4
sys/vm/uma_core.c
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@ -3170,14 +3170,14 @@ uma_reclaim_worker(void *arg __unused)
for (;;) {
sx_xlock(&uma_drain_lock);
while (uma_reclaim_needed == 0)
while (atomic_load_int(&uma_reclaim_needed) == 0)
sx_sleep(uma_reclaim, &uma_drain_lock, PVM, "umarcl",
hz);
sx_xunlock(&uma_drain_lock);
EVENTHANDLER_INVOKE(vm_lowmem, VM_LOW_KMEM);
sx_xlock(&uma_drain_lock);
uma_reclaim_locked(true);
uma_reclaim_needed = 0;
atomic_store_int(&uma_reclaim_needed, 0);
sx_xunlock(&uma_drain_lock);
/* Don't fire more than once per-second. */
pause("umarclslp", hz);