Author: kib
Date: Mon Nov 16 05:52:04 2015
New Revision: 290915
URL: https://svnweb.freebsd.org/changeset/base/290915
Log:
VM daemon works in parallel with the pagedaemon threads, and, among
other actions, swaps out kernel stacks of the processes. On the other
hand, currentl OOM logic which selects a process to kill in the
critical condition, skips process with swapped-out thread. Under some
loads, this results in the big(gest) process being ignored by OOM.
Do not skip a process which has inhibited thread due to the swap-out,
in the OOM selection loop. Note that killing such process requires
the thread stack page-in, but sometimes this is the only way to
recover.
Reported and tested by: pho
Reviewed by: alc
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks
Modified:
head/sys/vm/vm_pageout.c
Modified: head/sys/vm/vm_pageout.c
==============================================================================
--- head/sys/vm/vm_pageout.c Mon Nov 16 05:38:40 2015 (r290914)
+++ head/sys/vm/vm_pageout.c Mon Nov 16 05:52:04 2015 (r290915)
@@ -1554,7 +1554,8 @@ vm_pageout_oom(int shortage)
if (!TD_ON_RUNQ(td) &&
!TD_IS_RUNNING(td) &&
!TD_IS_SLEEPING(td) &&
- !TD_IS_SUSPENDED(td)) {
+ !TD_IS_SUSPENDED(td) &&
+ !TD_IS_SWAPPED(td)) {
thread_unlock(td);
breakout = 1;
break;
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