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author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-11-20 22:19:48 +0100 |
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committer | Ingo Molnar <mingo@elte.hu> | 2009-11-21 14:11:37 +0100 |
commit | f6d9dd237da400effb265f3554c64413f8a3e7b4 (patch) | |
tree | d06e7ec3385697a638b18c6890c087f0ac8e329b /Documentation/fault-injection | |
parent | f6595f3a9680c86b6332f881a7ae2cbbcfdc8619 (diff) | |
download | blackbird-op-linux-f6d9dd237da400effb265f3554c64413f8a3e7b4.tar.gz blackbird-op-linux-f6d9dd237da400effb265f3554c64413f8a3e7b4.zip |
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>
Diffstat (limited to 'Documentation/fault-injection')
0 files changed, 0 insertions, 0 deletions