linux-kernel - lock_stat &rq->lock/1 class name meaning

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Message-ID: <4DCAB8A2.8060605@linux.com>
Date:	Wed, 11 May 2011 18:26:10 +0200
From:	Juri Lelli <juri.lelli@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: lock_stat &rq->lock/1 class name meaning

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

Thanks a lot,
	Juri
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