linux-kernel - Re: [PATCH 1/1] mips: fault.c: Port OOM changes to do_page

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Message-ID: <CAFPAmTSi0i4q+mZ3KwVpEXiSoZ0=BeWUQgeSghd0PWPN+NojfA@mail.gmail.com>
Date:	Fri, 23 Dec 2011 17:12:38 +0530
From:	Kautuk Consul <consul.kautuk@...il.com>
To:	Ralf Baechle <ralf@...ux-mips.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org,
	"Mohd. Faris" <mohdfarisq2010@...il.com>,
	Kautuk Consul <consul.kautuk@...il.com>
Subject: Re: [PATCH 1/1] mips: fault.c: Port OOM changes to do_page_fault

>
> Without these changes, my MIPS board encounters many hang and livelock
> scenarios.
> After applying this patch, OOM feature performance improves according to
> my testing.
>

Just to clarify the hang scenario I am talking about, the test case I
used to reproduce
this problem is attached to this email.
Running this a few times hangs my console and then even Ctrl-C signals
do not get handled
and I also do not get back the command prompt.

After applying this patch things seem to improve, but there are still
some hangs which I
encounter which I am further trying to debug.

However, since the generic part of the kernel(mm/filemap.c) now
supports killable and
retryable page fault handling, I thought that this change would be
valid for MIPS too.

View attachment "stress_32k.c" of type "text/x-csrc" (3897 bytes)