From: Oleg Nesterov <oleg@tv-sign.ru>
Date: Thu, 7 Dec 2006 04:36:50 +0000 (-0800)
Subject: [PATCH] taskstats_exit_alloc: optimize/simplify
X-Git-Tag: v2.6.20-rc1~145^2^2~189
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=128fb95650b3273a8dc9ba5514b6fe7db8ea30bf;p=pandora-kernel.git

[PATCH] taskstats_exit_alloc: optimize/simplify

If there are no listeners, every task does unneeded kmem_cache alloc/free on
exit. We don't need listeners->sem for 'if (!list_empty())' check. Yes, we may
have a false positive, but this doesn't differ from the case when the listener
is unregistered after we drop the semaphore. So we don't need to do allocation
beforehand.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Balbir Singh <balbir@in.ibm.com>
Acked-by: Shailabh Nagar <nagar@watson.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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