From: Phillip Lougher <phillip@squashfs.org.uk>
Date: Mon, 18 Nov 2013 02:31:36 +0000 (+0000)
Subject: Squashfs: add multi-threaded decompression using percpu variable
X-Git-Tag: v3.13-rc1~24^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d208383d640727b70cd6689bc17e67e9b5ebf4ff;p=pandora-kernel.git

Squashfs: add multi-threaded decompression using percpu variable

Add a multi-threaded decompression implementation which uses
percpu variables.

Using percpu variables has advantages and disadvantages over
implementations which do not use percpu variables.

Advantages:
  * the nature of percpu variables ensures decompression is
    load-balanced across the multiple cores.
  * simplicity.

Disadvantages: it limits decompression to one thread per core.

Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>
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