Messages in this thread | | | Date | Mon, 07 Sep 2009 19:42:17 +0300 | From | Izik Eidus <> | Subject | Re: [PATCH 2/3] ksm: unmerge is an origin of OOMs |
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Hugh Dickins wrote: > 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>
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