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    SubjectRe: lock_stat &rq->lock/1 class name meaning
    On Wed, May 11, 2011 at 06:26:10PM +0200, Juri Lelli wrote:
    > Hi,
    > I'm trying to collect contention statistics through /proc/lock_stat
    > about scheduler data structures.
    >
    > What I obtain if a do "cat /proc/lock_stat" is something like:
    > ...
    > &rq->lock: 13128 13128 0.43
    > 190.53 103881.26 97454 3453404 0.00
    > 401.11 13224683.11
    > ---------
    > &rq->lock 645 [<ffffffff8103bfc4>]
    > task_rq_lock+0x43/0x75
    > &rq->lock 297 [<ffffffff8104ba65>]
    > try_to_wake_up+0x127/0x25a
    > &rq->lock 360 [<ffffffff8103c4c5>]
    > select_task_rq_fair+0x1f0/0x74a
    > &rq->lock 428 [<ffffffff81045f98>]
    > scheduler_tick+0x46/0x1fb
    > ---------
    > &rq->lock 77 [<ffffffff8103bfc4>]
    > task_rq_lock+0x43/0x75
    > &rq->lock 174 [<ffffffff8104ba65>]
    > try_to_wake_up+0x127/0x25a
    > &rq->lock 4715 [<ffffffff8103ed4b>]
    > double_rq_lock+0x42/0x54
    > &rq->lock 893 [<ffffffff81340524>] schedule+0x157/0x7b8
    > .
    > .
    > .
    > ...
    > &rq->lock/1: 11526 11488 0.33
    > 388.73 136294.31 21461 38404 0.00
    > 37.93 109388.53
    > -----------
    > &rq->lock/1 11526 [<ffffffff8103ed58>]
    > double_rq_lock+0x4f/0x54
    > -----------
    > &rq->lock/1 5645 [<ffffffff8103ed4b>]
    > double_rq_lock+0x42/0x54
    > &rq->lock/1 1224 [<ffffffff81340524>]
    > schedule+0x157/0x7b8
    > &rq->lock/1 4336 [<ffffffff8103ed58>]
    > double_rq_lock+0x4f/0x54
    > &rq->lock/1 181 [<ffffffff8104ba65>]
    > try_to_wake_up+0x127/0x25a
    >
    > I guess the first one is about the per-rq (per-CPU) spinlock, but
    > what about the second? What the "/1" stands for?

    It is also rq but it's subclass is 1.

    Take a look at raw_spin_lock_nested(&this_rq->lock, SINGLE_DEPTH_NESTING);
    in _double_lock_balance()

    > Since every rq has a different spinlock, does &rq->lock group
    > numbers from all the runqueues?

    Yup.

    Thanks,
    Yong

    >
    > Thanks a lot,
    > Juri
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