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authorDavid Rientjes <rientjes@google.com>2009-06-17 02:32:57 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-17 06:47:43 +0400
commit4d8b9135c30ccbe46e621fefd862969819003fd6 (patch)
tree47674640c8a65b3ba440b2dc224efbab7571c638 /fs/drop_caches.c
parent2ff05b2b4eac2e63d345fc731ea151a060247f53 (diff)
downloadlinux-4d8b9135c30ccbe46e621fefd862969819003fd6.tar.xz
oom: avoid unnecessary mm locking and scanning for OOM_DISABLE
This moves the check for OOM_DISABLE to the badness heuristic so it is only necessary to hold task_lock() once. If the mm is OOM_DISABLE, the score is 0, which is also correctly exported via /proc/pid/oom_score. This requires that tasks with badness scores of 0 are prohibited from being oom killed, which makes sense since they would not allow for future memory freeing anyway. Since the oom_adj value is a characteristic of an mm and not a task, it is no longer necessary to check the oom_adj value for threads sharing the same memory (except when simply issuing SIGKILLs for threads in other thread groups). Cc: Nick Piggin <npiggin@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mel@csn.ul.ie> 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>
Diffstat (limited to 'fs/drop_caches.c')
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