linux-kernel - [PATCH 0/2] /proc/stat vs. failed order-4 allocation

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Message-Id: <1402909492-36486-1-git-send-email-heiko.carstens@de.ibm.com>
Date:	Mon, 16 Jun 2014 11:04:50 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	David Rientjes <rientjes@...gle.com>, Ian Kent <raven@...maw.net>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Thorsten Diehl <thorsten.diehl@...ibm.com>,
	Andrea Righi <andrea@...terlinux.com>,
	Christoph Hellwig <hch@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Stefan Bader <stefan.bader@...onical.com>,
	linux-kernel@...r.kernel.org,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: [PATCH 0/2] /proc/stat vs. failed order-4 allocation

These two patches are supposed to "fix" failed order-4 memory
allocations which have been observed when reading /proc/stat.
The problem has been observed on s390 as well as on x86.

To address the problem change the seq_file memory allocations to
fallback to use vmalloc, so that allocations also work if memory
is fragmented.

This approach seems to be simpler and less intrusive than changing
/proc/stat to use an interator. Also it "fixes" other users as well,
which use seq_file's single_open() interface.

Heiko Carstens (2):
  proc/stat: convert to single_open_size()
  fs/seq_file: fallback to vmalloc allocation

 fs/proc/stat.c | 22 ++--------------------
 fs/seq_file.c  | 30 +++++++++++++++++++++---------
 2 files changed, 23 insertions(+), 29 deletions(-)

-- 
1.8.5.5

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