KAMEZAWA Hiroyuki 867578cbcc memcg: fix oom kill behavior ... In current page-fault code, handle_mm_fault() -> ... -> mem_cgroup_charge() -> map page or handle error. -> check return code. If page fault's return code is VM_FAULT_OOM, page_fault_out_of_memory() is called. But if it's caused by memcg, OOM should have been already invoked. Then, I added a patch: a636b327f7. That patch records last_oom_jiffies for memcg's sub-hierarchy and prevents page_fault_out_of_memory from being invoked in near future. But Nishimura-san reported that check by jiffies is not enough when the system is terribly heavy. This patch changes memcg's oom logic as. * If memcg causes OOM-kill, continue to retry. * remove jiffies check which is used now. * add memcg-oom-lock which works like perzone oom lock. * If current is killed(as a process), bypass charge. Something more sophisticated can be added but this pactch does fundamental things. TODO: - add oom notifier - add permemcg disable-oom-kill flag and freezer at oom. - more chances for wake up oom waiter (when changing memory limit etc..) Reviewed-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Tested-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: David Rientjes <rientjes@google.com> Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2010-03-12 15:52:38 -08:00
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acpi	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2010-03-03 07:34:18 -08:00
asm-generic	gpio: introduce gpio_request_one() and friends	2010-03-06 11:26:48 -08:00
crypto
drm	Merge branch 'drm-radeon-testing' of /ssd/git/drm-radeon-next into drm-next-stage	2010-03-01 16:08:57 +10:00
keys
linux	memcg: fix oom kill behavior	2010-03-12 15:52:38 -08:00
math-emu
media
mtd
net	9P2010.L handshake: Remove "dotu" variable	2010-03-05 15:04:42 -06:00
pcmcia
rdma	Merge branch 'misc' into for-next	2010-03-01 23:52:31 -08:00
rxrpc
scsi
sound	Merge branch 'topic/misc' into for-linus	2010-03-08 09:35:50 +01:00
trace	Merge branch 'kvm-updates/2.6.34' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2010-03-05 13:12:34 -08:00
video	broadsheetfb: support storing waveform	2010-03-12 15:52:34 -08:00
xen
Kbuild