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[PATCH] oom: less memdie

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Don't cause all threads in all other thread groups to gain TIF_MEMDIE
otherwise we'll get a thundering herd eating our memory reserve.  This may not
be the optimal scheme, but it fits our policy of allowing just one TIF_MEMDIE
in the system at once.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Nick Piggin 2006-12-06 20:31:52 -08:00 committed by Linus Torvalds
parent f3af38d30c
commit f2a2a7108a
1 changed files with 3 additions and 2 deletions
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mm/oom_kill.c
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@ -323,11 +323,12 @@ static int oom_kill_task(struct task_struct *p)
/* /*
* kill all processes that share the ->mm (i.e. all threads), * kill all processes that share the ->mm (i.e. all threads),
* but are in a different thread group. * but are in a different thread group. Don't let them have access
* to memory reserves though, otherwise we might deplete all memory.
*/ */
do_each_thread(g, q) { do_each_thread(g, q) {
if (q->mm == mm && q->tgid != p->tgid) if (q->mm == mm && q->tgid != p->tgid)
__oom_kill_task(q, 1); force_sig(SIGKILL, p);
} while_each_thread(g, q); } while_each_thread(g, q);
return 0; return 0;