lkml.org 
[lkml]   [2011]   [May]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
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
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/


\
 
 \ /
  Last update: 2011-05-12 13:01    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site