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oom: prevent livelock when oom_kill_allocating_task is set 

When /proc/sys/vm/oom_kill_allocating_task is set for large systems that
want to avoid the lengthy tasklist scan, it's possible to livelock if
current is ineligible for oom kill.  This normally happens when it is set
to OOM_DISABLE, but is also possible if any threads are sharing the same
->mm with a different tgid.

So change __out_of_memory() to fall back to the full task-list scan if it
was unable to kill `current'.

Cc: Nick Piggin <npiggin@suse.de>
Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes 2009-05-06 16:02:55 -07:00 committed by Linus Torvalds
parent df3935ffd6
commit 184101bf14
1 changed files with 21 additions and 23 deletions
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44
mm/oom_kill.c
View File

@ -514,34 +514,32 @@ void clear_zonelist_oom(struct zonelist *zonelist, gfp_t gfp_mask)
*/
static void __out_of_memory(gfp_t gfp_mask, int order)
{
if (sysctl_oom_kill_allocating_task) {
oom_kill_process(current, gfp_mask, order, 0, NULL,
"Out of memory (oom_kill_allocating_task)");
struct task_struct *p;
unsigned long points;
} else {
unsigned long points;
struct task_struct *p;
retry:
/*
* Rambo mode: Shoot down a process and hope it solves whatever
* issues we may have.
*/
p = select_bad_process(&points, NULL);
if (PTR_ERR(p) == -1UL)
if (sysctl_oom_kill_allocating_task)
if (!oom_kill_process(current, gfp_mask, order, 0, NULL,
"Out of memory (oom_kill_allocating_task)"))
return;
retry:
/*
* Rambo mode: Shoot down a process and hope it solves whatever
* issues we may have.
*/
p = select_bad_process(&points, NULL);
/* Found nothing?!?! Either we hang forever, or we panic. */
if (!p) {
read_unlock(&tasklist_lock);
panic("Out of memory and no killable processes...\n");
}
if (PTR_ERR(p) == -1UL)
return;
if (oom_kill_process(p, gfp_mask, order, points, NULL,
"Out of memory"))
goto retry;
/* Found nothing?!?! Either we hang forever, or we panic. */
if (!p) {
read_unlock(&tasklist_lock);
panic("Out of memory and no killable processes...\n");
}
if (oom_kill_process(p, gfp_mask, order, points, NULL,
"Out of memory"))
goto retry;
}
/*