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| author | David Rientjes <rientjes@google.com> | 2012-05-30 00:06:23 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-30 01:22:19 +0200 |
| commit | 1f1d06c34f7675026326cd9f39ff91e4555cf355 (patch) | |
| tree | b2493685179e3b222c915002648c3baba56318d2 /mm/mempolicy.c | |
| parent | mm/vmstat.c: remove debug fs entries on failure of file creation and made ext... (diff) | |
| download | linux-1f1d06c34f7675026326cd9f39ff91e4555cf355.tar.xz linux-1f1d06c34f7675026326cd9f39ff91e4555cf355.zip | |
thp, memcg: split hugepage for memcg oom on cow
On COW, a new hugepage is allocated and charged to the memcg. If the
system is oom or the charge to the memcg fails, however, the fault
handler will return VM_FAULT_OOM which results in an oom kill.
Instead, it's possible to fallback to splitting the hugepage so that the
COW results only in an order-0 page being allocated and charged to the
memcg which has a higher liklihood to succeed. This is expensive
because the hugepage must be split in the page fault handler, but it is
much better than unnecessarily oom killing a process.
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <jweiner@redhat.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michal Hocko <mhocko@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mempolicy.c')
0 files changed, 0 insertions, 0 deletions