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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: David Rientjes <rientjes@google.com>
Cc: kosaki.motohiro@jp.fujitsu.com,
	Andrew Morton <akpm@linux-foundation.org>,
	Rik van Riel <riel@redhat.com>, Nick Piggin <npiggin@suse.de>,
	Oleg Nesterov <oleg@redhat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	Balbir Singh <balbir@linux.vnet.ibm.com>,
	linux-mm@kvack.org
Subject: Re: [patch -mm 11/18] oom: avoid oom killer for lowmem allocations
Date: Tue,  1 Jun 2010 16:38:34 +0900 (JST)	[thread overview]
Message-ID: <20100601163813.2466.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1006010015460.29202@chino.kir.corp.google.com>

> If memory has been depleted in lowmem zones even with the protection
> afforded to it by /proc/sys/vm/lowmem_reserve_ratio, it is unlikely that
> killing current users will help.  The memory is either reclaimable (or
> migratable) already, in which case we should not invoke the oom killer at
> all, or it is pinned by an application for I/O.  Killing such an
> application may leave the hardware in an unspecified state and there is no
> guarantee that it will be able to make a timely exit.
> 
> Lowmem allocations are now failed in oom conditions when __GFP_NOFAIL is
> not used so that the task can perhaps recover or try again later.
> 
> Previously, the heuristic provided some protection for those tasks with
> CAP_SYS_RAWIO, but this is no longer necessary since we will not be
> killing tasks for the purposes of ISA allocations.
> 
> high_zoneidx is gfp_zone(gfp_flags), meaning that ZONE_NORMAL will be the
> default for all allocations that are not __GFP_DMA, __GFP_DMA32,
> __GFP_HIGHMEM, and __GFP_MOVABLE on kernels configured to support those
> flags.  Testing for high_zoneidx being less than ZONE_NORMAL will only
> return true for allocations that have either __GFP_DMA or __GFP_DMA32.
> 
> Signed-off-by: David Rientjes <rientjes@google.com>

ack


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  reply	other threads:[~2010-06-01  7:38 UTC|newest]

Thread overview: 99+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-01  7:18 [patch -mm 00/18] oom killer rewrite David Rientjes
2010-06-01  7:18 ` [patch -mm 01/18] oom: filter tasks not sharing the same cpuset David Rientjes
2010-06-01  7:20   ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 18:37     ` David Rientjes
2010-06-13 11:24       ` KOSAKI Motohiro
2010-06-17  3:33         ` David Rientjes
2010-06-21 11:45           ` KOSAKI Motohiro
2010-06-21 11:45           ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 18:43     ` David Rientjes
2010-06-08 23:25       ` Andrew Morton
2010-06-08 23:54         ` David Rientjes
2010-06-09  0:06           ` Andrew Morton
2010-06-09  1:07             ` David Rientjes
2010-06-13 11:24             ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 02/18] oom: sacrifice child with highest badness score for parent David Rientjes
2010-06-01  7:39   ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 18:41     ` David Rientjes
2010-06-13 11:24       ` KOSAKI Motohiro
2010-06-14  8:54         ` David Rientjes
2010-06-14 11:08           ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 18:45     ` David Rientjes
2010-06-01  7:18 ` [patch -mm 03/18] oom: select task from tasklist for mempolicy ooms David Rientjes
2010-06-01  7:39   ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 23:28     ` Andrew Morton
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 04/18] oom: extract panic helper function David Rientjes
2010-06-01  7:33   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 05/18] oom: remove special handling for pagefault ooms David Rientjes
2010-06-01  7:34   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 06/18] oom: move sysctl declarations to oom.h David Rientjes
2010-06-01  7:34   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 07/18] oom: enable oom tasklist dump by default David Rientjes
2010-06-01  7:36   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 08/18] oom: badness heuristic rewrite David Rientjes
2010-06-01  7:36   ` KOSAKI Motohiro
2010-06-01 18:44     ` David Rientjes
2010-06-02 13:54       ` KOSAKI Motohiro
2010-06-02 21:20         ` David Rientjes
2010-06-03 23:10         ` Andrew Morton
2010-06-03 23:53           ` KAMEZAWA Hiroyuki
2010-06-04  0:04             ` Andrew Morton
2010-06-04  0:20               ` KAMEZAWA Hiroyuki
2010-06-04  5:57                 ` KAMEZAWA Hiroyuki
2010-06-04  9:22                   ` David Rientjes
2010-06-04  9:19             ` David Rientjes
2010-06-04  9:43             ` Oleg Nesterov
2010-06-04 10:54           ` KOSAKI Motohiro
2010-06-04 20:57             ` David Rientjes
2010-06-08 11:41               ` KOSAKI Motohiro
2010-06-08 23:47                 ` Andrew Morton
2010-06-17  3:28                   ` David Rientjes
2010-06-01  7:46   ` Nick Piggin
2010-06-01 18:56     ` David Rientjes
2010-06-02 13:54       ` KOSAKI Motohiro
2010-06-02 21:23         ` David Rientjes
2010-06-03  0:05           ` KAMEZAWA Hiroyuki
2010-06-03  6:44             ` David Rientjes
2010-06-03  3:07           ` KOSAKI Motohiro
2010-06-03  6:48             ` David Rientjes
2010-06-03 23:15             ` Andrew Morton
2010-06-04 10:54               ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 09/18] oom: add forkbomb penalty to badness heuristic David Rientjes
2010-06-01  7:37   ` KOSAKI Motohiro
2010-06-01 18:57     ` David Rientjes
2010-06-03 20:33       ` David Rientjes
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 10/18] oom: deprecate oom_adj tunable David Rientjes
2010-06-01  7:37   ` KOSAKI Motohiro
2010-06-01  7:18 ` [patch -mm 11/18] oom: avoid oom killer for lowmem allocations David Rientjes
2010-06-01  7:38   ` KOSAKI Motohiro [this message]
2010-06-08 11:41   ` KOSAKI Motohiro
2010-06-08 18:38     ` David Rientjes
2010-06-01  7:18 ` [patch -mm 12/18] oom: remove unnecessary code and cleanup David Rientjes
2010-06-01  7:40   ` KOSAKI Motohiro
2010-06-01 18:58     ` David Rientjes
2010-06-01  7:19 ` [patch -mm 13/18] oom: avoid race for oom killed tasks detaching mm prior to exit David Rientjes
2010-06-01  7:40   ` KOSAKI Motohiro
2010-06-01 18:59     ` David Rientjes
2010-06-01 20:43       ` Oleg Nesterov
2010-06-01 21:19         ` David Rientjes
2010-06-02  0:28         ` KAMEZAWA Hiroyuki
2010-06-02  9:49           ` David Rientjes
2010-06-02 10:46             ` Nick Piggin
2010-06-02 21:35               ` David Rientjes
2010-06-02 13:54         ` KOSAKI Motohiro
2010-06-01  7:19 ` [patch -mm 14/18] oom: check PF_KTHREAD instead of !mm to skip kthreads David Rientjes
2010-06-01  7:41   ` KOSAKI Motohiro
2010-06-01  7:19 ` [patch -mm 15/18] oom: introduce find_lock_task_mm() to fix !mm false positives David Rientjes
2010-06-01  7:41   ` KOSAKI Motohiro
2010-06-01  7:19 ` [patch -mm 16/18] oom: give current access to memory reserves if it has been killed David Rientjes
2010-06-01  7:44   ` KOSAKI Motohiro
2010-06-01  7:19 ` [patch -mm 17/18] oom: avoid sending exiting tasks a SIGKILL David Rientjes
2010-06-01  7:19 ` [patch -mm 18/18] oom: clean up oom_kill_task() David Rientjes

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