From: Paul Jackson <pj@sgi.com>
Date: Mon, 12 Sep 2005 11:30:30 +0000 (-0700)
Subject: [PATCH] cpuset semaphore depth check optimize
X-Git-Tag: v2.6.14-rc1~88
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b3426599af9524104be6938bcb1fcaab314781c7;p=pandora-kernel.git

[PATCH] cpuset semaphore depth check optimize

Optimize the deadlock avoidance check on the global cpuset
semaphore cpuset_sem.  Instead of adding a depth counter to the
task struct of each task, rather just two words are enough, one
to store the depth and the other the current cpuset_sem holder.

Thanks to Nikita Danilov for the idea.

Signed-off-by: Paul Jackson <pj@sgi.com>

[ We may want to change this further, but at least it's now
  a totally internal decision to the cpusets code ]

Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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