linux-kernel - [PATCH 0/20] mmu: arch/mm: Port OOM changes to arch page fault handlers.

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Message-ID: <CAFPAmTQs9dOpQTaXU=6Or66YU+my_CnPw33TE4h++YArBNa38g@mail.gmail.com>
Date:	Tue, 20 Mar 2012 09:18:14 -0400
From:	Kautuk Consul <consul.kautuk@...il.com>
To:	linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux@...ts.openrisc.net, linux-am33-list@...hat.com,
	microblaze-uclinux@...e.uq.edu.au, linux-m68k@...ts.linux-m68k.org,
	linux-m32r-ja@...linux-m32r.org, linux-ia64@...r.kernel.org,
	linux-hexagon@...r.kernel.org, linux-cris-kernel@...s.com,
	linux-sh@...r.kernel.org, linux-parisc@...r.kernel.org,
	sparclinux@...r.kernel.org
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH 0/20] mmu: arch/mm: Port OOM changes to arch page fault handlers.

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.

I was facing hang and livelock problems on my ARM and MIPS boards when
I invoked OOM by running the stress_32k.c test-case attached to this email.

Since both the ARM and MIPS porting chainges were accepted, me and my
co-worker decided to take the initiative to port these changes to all other
MMU based architectures.

Please review and do write back if there is any way I need to
improve/rewrite any
of these patches.

Signed-off-by: Mohd. Faris <mohdfarisq2010@...il.com>
Signed-off-by: Kautuk Consul <consul.kautuk@...il.com>
---

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