linux-kernel - Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with nodemask v3

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Date:	Wed, 11 Nov 2009 11:36:42 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	cl@...ux-foundation.org, rientjes@...gle.com
Subject: Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with nodemask v3

> From: KAMEZAWA Hiroyuki <kamezawa.hioryu@...fujitsu.com>
> 
> Fixing node-oriented allocation handling in oom-kill.c
> I myself think this as bugfix not as ehnancement.
> 
> In these days, things are changed as
>   - alloc_pages() eats nodemask as its arguments, __alloc_pages_nodemask().
>   - mempolicy don't maintain its own private zonelists.
>   (And cpuset doesn't use nodemask for __alloc_pages_nodemask())
> 
> But, current oom-killer's doesn't handle nodemask and it's wrong.
> 
> This patch does
>   - check nodemask, if nodemask && nodemask doesn't cover all
>     node_states[N_HIGH_MEMORY], this is CONSTRAINT_MEMORY_POLICY.
>   - Scan all zonelist under nodemask, if it hits cpuset's wall
>     this faiulre is from cpuset.
> And
>   - modifies the caller of out_of_memory not to call oom if __GFP_THISNODE.
>     This doesn't change "current" behavior.
>     If callers use __GFP_THISNODE, it should handle "page allocation failure"
>     by itself.
> 
> Changelog: 2009/11/11
>  - fixed nodes_equal() calculation.
>  - return CONSTRAINT_MEMPOLICY always if given nodemask is not enough big.
> 
> Changelog: 2009/11/06
>  - fixed lack of oom.h
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hioryu@...fujitsu.com>
> ---
>  drivers/char/sysrq.c |    2 +-
>  include/linux/oom.h  |    4 +++-
>  mm/oom_kill.c        |   44 ++++++++++++++++++++++++++++++++------------
>  mm/page_alloc.c      |   10 ++++++++--
>  4 files changed, 44 insertions(+), 16 deletions(-)
> 

Looks good to me.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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