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

[KOSAKI Motohiro]

> From: KAMEZAWA Hiroyuki <kamezawa.hioryu@xxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxx>
> ---
>  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@xxxxxxxxxxxxxx>



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