Re: [PATCH 5/5] x86,mm: make pagefault killable

[Minchan Kim]

On Tue, Mar 22, 2011 at 08:09:29PM +0900, KOSAKI Motohiro wrote:
> When oom killer occured, almost processes are getting stuck following
> two points.
> 
> 	1) __alloc_pages_nodemask
> 	2) __lock_page_or_retry
> 
> 1) is not much problematic because TIF_MEMDIE lead to make allocation
> failure and get out from page allocator. 2) is more problematic. When
> OOM situation, Zones typically don't have page cache at all and Memory
> starvation might lead to reduce IO performance largely. When fork bomb
> occur, TIF_MEMDIE task don't die quickly mean fork bomb may create
> new process quickly rather than oom-killer kill it. Then, the system
> may become livelock.
> 
> This patch makes pagefault interruptible by SIGKILL.
> 
> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

Looks like a cool idea.

-- 
Kind regards,
Minchan Kim
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