mm: copy over oom_adj value at fork time
authorRik van Riel <riel@redhat.com>
Wed, 29 Jul 2009 22:02:07 +0000 (15:02 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 30 Jul 2009 02:10:34 +0000 (19:10 -0700)
commit933b787b57ca8bdc0fc8fb2cbf67b5e6d21beb84
treeaae84533e71c7574ab8dd6f0ca4b782de121e482
parent6583bb64fc370842b32a87c67750c26f6d559af0
mm: copy over oom_adj value at fork time

Fix a post-2.6.31 regression which was introduced by
2ff05b2b4eac2e63d345fc731ea151a060247f53 ("oom: move oom_adj value from
task_struct to mm_struct").

After moving the oom_adj value from the task struct to the mm_struct, the
oom_adj value was no longer properly inherited by child processes.

Copying over the oom_adj value at fork time fixes that bug.

[kosaki.motohiro@jp.fujitsu.com: test for current->mm before dereferencing it]
Signed-off-by: Rik van Riel <riel@redhat.com>
Reported-by: Paul Menage <manage@google.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/fork.c