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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-11-20 22:19:48 +0100
committerIngo Molnar <mingo@elte.hu>2009-11-21 14:11:37 +0100
commitf6d9dd237da400effb265f3554c64413f8a3e7b4 (patch)
treed06e7ec3385697a638b18c6890c087f0ac8e329b /Documentation/fault-injection
parentf6595f3a9680c86b6332f881a7ae2cbbcfdc8619 (diff)
downloadblackbird-op-linux-f6d9dd237da400effb265f3554c64413f8a3e7b4.tar.gz
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perf: Optimize perf_event_mmap_ctx()
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: <20091120212508.606459548@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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