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    Subject[tip:perf/core] perf: Remove 64-bit alignment padding from perf_event_context
    Commit-ID:  28009ce4a8130af7260a9271901b4419834ad152
    Gitweb: http://git.kernel.org/tip/28009ce4a8130af7260a9271901b4419834ad152
    Author: Richard Kennedy <richard@rsk.demon.co.uk>
    AuthorDate: Tue, 7 Jun 2011 16:33:38 +0100
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Fri, 1 Jul 2011 11:06:32 +0200

    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>
    ---
    include/linux/perf_event.h | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
    index e76a410..2f7b5d4 100644
    --- 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;
    };

    /*

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