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authorHugh Dickins <hugh.dickins@tiscali.co.uk>2009-09-21 17:02:27 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:33 -0700
commit35451beecbd7c86ce3249d543594517a5fe9a0cd (patch)
treee72759e6e6fcd142ab85c607a9b3dd3e1c016eed /include
parenta913e182ab9484308e870af37a14d372742d53b0 (diff)
downloadlinux-35451beecbd7c86ce3249d543594517a5fe9a0cd.tar.bz2
ksm: unmerge is an origin of OOMs
Just as the swapoff system call allocates many pages of RAM to various processes, perhaps triggering OOM, so "echo 2 >/sys/kernel/mm/ksm/run" (unmerge) is liable to allocate many pages of RAM to various processes, perhaps triggering OOM; and each is normally run from a modest admin process (swapoff or shell), easily repeated until it succeeds. So treat unmerge_and_remove_all_rmap_items() in the same way that we treat try_to_unuse(): generalize PF_SWAPOFF to PF_OOM_ORIGIN, and bracket both with that, to ask the OOM killer to kill them first, to prevent them from spawning more and more OOM kills. Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Izik Eidus <ieidus@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sched.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8f3e63cb33a6..899d7304d594 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1720,7 +1720,7 @@ extern cputime_t task_gtime(struct task_struct *p);
#define PF_FROZEN 0x00010000 /* frozen for system suspend */
#define PF_FSTRANS 0x00020000 /* inside a filesystem transaction */
#define PF_KSWAPD 0x00040000 /* I am kswapd */
-#define PF_SWAPOFF 0x00080000 /* I am in swapoff */
+#define PF_OOM_ORIGIN 0x00080000 /* Allocating much memory to others */
#define PF_LESS_THROTTLE 0x00100000 /* Throttle me less: I clean memory */
#define PF_KTHREAD 0x00200000 /* I am a kernel thread */
#define PF_RANDOMIZE 0x00400000 /* randomize virtual address space */