linux-kernel - Re: [PATCH 1/1 v5] arm: fault.c: Port OOM changes into do_page

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Date:	Sat, 26 Nov 2011 23:50:32 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kautuk Consul <consul.kautuk@...il.com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1 v5] arm: fault.c: Port OOM changes into
	do_page_fault

On Tue, Nov 22, 2011 at 01:31:30PM -0500, Kautuk Consul wrote:
> Commit d065bd810b6deb67d4897a14bfe21f8eb526ba99
> (mm: retry page fault when blocking on disk transfer) and
> commit 37b23e0525d393d48a7d59f870b3bc061a30ccdb
> (x86,mm: make pagefault killable)
> 
> The above commits introduced changes into the x86 pagefault handler
> for making the page fault handler retryable as well as killable.
> 
> These changes reduce the mmap_sem hold time, which is crucial
> during OOM killer invocation.
> 
> Port these changes to ARM.
> 
> Without these changes, my ARM board encounters many hang and livelock
> scenarios.
> After applying this patch, OOM feature performance improves according to
> my testing.
> 
> Signed-off-by: Kautuk Consul <consul.kautuk@...il.com>

Thanks.  I think this is fine.  Please put it in the patch system so it's
not forgotten, and I'll get to it sometime during the next week.  Thanks.
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