* How to interpret this
@ 2008-01-10 16:35 Pei Yan
2008-01-11 9:10 ` Jens Axboe
0 siblings, 1 reply; 2+ messages in thread
From: Pei Yan @ 2008-01-10 16:35 UTC (permalink / raw)
To: linux-btrace
Hi,
8,16 0 8 0.000594537 3420 Q R 1318936 + 8 [fio]
8,16 0 9 0.000596873 3420 G R 1318936 + 8 [fio]
8,16 0 10 0.000597670 3420 P N [fio]
8,16 0 11 0.000598051 3420 I R 1318936 + 8 [fio]
8,16 0 12 0.000600492 3420 D R 1318936 + 8 [fio]
8,16 0 13 0.000669173 3420 U N [fio] 1
> 8,16 0 14 0.015246002 3380 C R 1318936 + 8 [0]
8,16 0 15 0.121368302 3421 Q R 12328 + 8 [fio]
8,16 0 16 0.121376327 3421 G R 12328 + 8 [fio]
8,16 0 17 0.121378041 3421 P N [fio]
8,16 0 18 0.121378833 3421 I R 12328 + 8 [fio]
8,16 0 19 0.121381194 3421 U N [fio] 1
8,16 0 20 0.121732327 3422 Q R 1576976 + 8 [fio]
8,16 0 21 0.121735570 3422 G R 1576976 + 8 [fio]
8,16 0 22 0.121736232 3422 I R 1576976 + 8 [fio]
8,16 0 23 0.121737335 3422 U N [fio] 2
> 8,16 0 24 0.128906924 17 D R 12328 + 8 [kblockd/0]
> 8,16 0 25 0.129079556 0 C R 12328 + 8 [0]
8,16 0 26 0.129139932 3421 Q R 12336 + 8 [fio]
8,16 0 27 0.129142609 3421 G R 12336 + 8 [fio]
8,16 0 28 0.129143370 3421 I R 12336 + 8 [fio]
8,16 0 29 0.129145791 3421 D R 12336 + 8 [fio]
8,16 0 30 0.129213867 3421 U N [fio] 2
> 8,16 0 31 0.129276092 0 C R 12336 + 8 [0]
Q: why are the pids in four tagged lines above changed? For example, in the
first tagged line, the pid related to the same request(1318936 + 8) changes
to 3380 from 3420. Why?
Are there any methods to ensure that all activities initiated by a process
be all tagged with the pid of that initiating process?
I will appreciate any answers!
Thanks.
P.Y
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How to interpret this
2008-01-10 16:35 How to interpret this Pei Yan
@ 2008-01-11 9:10 ` Jens Axboe
0 siblings, 0 replies; 2+ messages in thread
From: Jens Axboe @ 2008-01-11 9:10 UTC (permalink / raw)
To: linux-btrace
On Thu, Jan 10 2008, Pei Yan wrote:
> Hi,
>
> 8,16 0 8 0.000594537 3420 Q R 1318936 + 8 [fio]
> 8,16 0 9 0.000596873 3420 G R 1318936 + 8 [fio]
> 8,16 0 10 0.000597670 3420 P N [fio]
> 8,16 0 11 0.000598051 3420 I R 1318936 + 8 [fio]
> 8,16 0 12 0.000600492 3420 D R 1318936 + 8 [fio]
> 8,16 0 13 0.000669173 3420 U N [fio] 1
> > 8,16 0 14 0.015246002 3380 C R 1318936 + 8 [0]
> 8,16 0 15 0.121368302 3421 Q R 12328 + 8 [fio]
> 8,16 0 16 0.121376327 3421 G R 12328 + 8 [fio]
> 8,16 0 17 0.121378041 3421 P N [fio]
> 8,16 0 18 0.121378833 3421 I R 12328 + 8 [fio]
> 8,16 0 19 0.121381194 3421 U N [fio] 1
> 8,16 0 20 0.121732327 3422 Q R 1576976 + 8 [fio]
> 8,16 0 21 0.121735570 3422 G R 1576976 + 8 [fio]
> 8,16 0 22 0.121736232 3422 I R 1576976 + 8 [fio]
> 8,16 0 23 0.121737335 3422 U N [fio] 2
> > 8,16 0 24 0.128906924 17 D R 12328 + 8 [kblockd/0]
> > 8,16 0 25 0.129079556 0 C R 12328 + 8 [0]
> 8,16 0 26 0.129139932 3421 Q R 12336 + 8 [fio]
> 8,16 0 27 0.129142609 3421 G R 12336 + 8 [fio]
> 8,16 0 28 0.129143370 3421 I R 12336 + 8 [fio]
> 8,16 0 29 0.129145791 3421 D R 12336 + 8 [fio]
> 8,16 0 30 0.129213867 3421 U N [fio] 2
> > 8,16 0 31 0.129276092 0 C R 12336 + 8 [0]
>
>
> Q: why are the pids in four tagged lines above changed? For example, in the
> first tagged line, the pid related to the same request(1318936 + 8) changes
> to 3380 from 3420. Why?
The pid denotes who did the action listed. So for eg completions, they
typically happen from irq context and thus aren't specific to a process.
> Are there any methods to ensure that all activities initiated by a process
> be all tagged with the pid of that initiating process?
No, you should track by location like blkparse does.
--
Jens Axboe
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2008-01-10 16:35 How to interpret this Pei Yan
2008-01-11 9:10 ` Jens Axboe
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