perf: Remove 64-bit alignment padding from perf_event_context

Reorder perf_event_context to remove 8 bytes of 64 bit alignment padding
shrinking its size to 192 bytes, allowing it to fit into a smaller slab
and use one fewer cache lines.

Signed-off-by: Richard Kennedy <richard@rsk.demon.co.uk>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1307460819.1950.5.camel@castor.rsk
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index e76a41010e1ff5120248710e8193f5133820c67f..2f7b5d42ab4160b89afa276e5314290f50951765 100644 (file)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -894,8 +894,8 @@ struct perf_event_context {
        u64                             parent_gen;
        u64                             generation;
        int                             pin_count;
-       struct rcu_head                 rcu_head;
        int                             nr_cgroups; /* cgroup events present */
+       struct rcu_head                 rcu_head;
 };
 
 /*