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author | David Rientjes <rientjes@google.com> | 2009-06-17 00:32:57 +0200 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-06-17 04:47:43 +0200 |
commit | 4d8b9135c30ccbe46e621fefd862969819003fd6 (patch) | |
tree | 47674640c8a65b3ba440b2dc224efbab7571c638 /mm/truncate.c | |
parent | oom: move oom_adj value from task_struct to mm_struct (diff) | |
download | linux-4d8b9135c30ccbe46e621fefd862969819003fd6.tar.xz linux-4d8b9135c30ccbe46e621fefd862969819003fd6.zip |
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 'mm/truncate.c')
0 files changed, 0 insertions, 0 deletions