From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 20 Nov 2009 21:19:45 +0000 (+0100)
Subject: perf: Optimize perf_swevent_ctx_event()
X-Git-Tag: v2.6.33-rc1~399^2~137
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81520183878a8813c71c9372de28bb70913ba549;p=pandora-kernel.git

perf: Optimize perf_swevent_ctx_event()

Remove a rcu_read_{,un}lock() pair and a few conditionals.

We can remove the rcu_read_lock() by increasing the scope of one
in the calling function.

We can do away with the system_state check if the machine still
boots after this patch (seems to be the case).

We can do away with the list_empty() check because the bare
list_for_each_entry_rcu() reduces to that now that we've removed
everything else.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091120212508.378188589@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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