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    Subject[tip:perfcounters/core] perf_counter: add some comments
    Commit-ID:  8740f9418c78dcad694b46ab25d1645d5aef1f5e
    Gitweb: http://git.kernel.org/tip/8740f9418c78dcad694b46ab25d1645d5aef1f5e
    Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
    AuthorDate: Wed, 8 Apr 2009 15:01:29 +0200
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Wed, 8 Apr 2009 18:53:29 +0200

    perf_counter: add some comments

    Add a few comments because I was forgetting what field what for what
    functionality.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Mackerras <paulus@samba.org>
    Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
    LKML-Reference: <20090408130409.036984214@chello.nl>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>


    ---
    include/linux/perf_counter.h | 10 ++++++----
    1 files changed, 6 insertions(+), 4 deletions(-)

    diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
    index 4809ae1..8bf764f 100644
    --- a/include/linux/perf_counter.h
    +++ b/include/linux/perf_counter.h
    @@ -344,10 +344,12 @@ struct file;

    struct perf_mmap_data {
    struct rcu_head rcu_head;
    - int nr_pages;
    - atomic_t wakeup;
    - atomic_t head;
    - atomic_t events;
    + int nr_pages; /* nr of data pages */
    +
    + atomic_t wakeup; /* POLL_ for wakeups */
    + atomic_t head; /* write position */
    + atomic_t events; /* event limit */
    +
    struct perf_counter_mmap_page *user_page;
    void *data_pages[0];
    };

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