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author | Hugh Dickins <hugh.dickins@tiscali.co.uk> | 2009-09-21 17:02:27 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-09-22 07:17:33 -0700 |
commit | 35451beecbd7c86ce3249d543594517a5fe9a0cd (patch) | |
tree | e72759e6e6fcd142ab85c607a9b3dd3e1c016eed /mm/mremap.c | |
parent | a913e182ab9484308e870af37a14d372742d53b0 (diff) | |
download | linux-stable-35451beecbd7c86ce3249d543594517a5fe9a0cd.tar.gz linux-stable-35451beecbd7c86ce3249d543594517a5fe9a0cd.tar.bz2 linux-stable-35451beecbd7c86ce3249d543594517a5fe9a0cd.zip |
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 'mm/mremap.c')
0 files changed, 0 insertions, 0 deletions