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SubjectRe: [PATCH 0/4] ftrace, workqueuetrace: Add worklet informationame
On Mon, Apr 20, 2009 at 02:42:11PM +0800, Zhaolei wrote:
> Hello,
>
> To make workqueuetrace support per-worklet's time mesurement(max execution,
> latecy), workqueue trace need to support per-worklet's stat information first.
> This patchset add them.
>
> Before patch:
> # cat [debugfs]/tracing/trace_stat/workqueues
> # CPU INSERTED EXECUTED NAME
> # | | | |
>
> 0 589 589 events/0
> 0 0 0 cpuset
> 0 656 656 khelper
> 0 0 0 netns
> 0 809 809 kblockd/0
> 0 0 0 kacpid
> 0 0 0 kacpi_notify
> 0 0 0 ata/0
> 0 0 0 ata_aux
> 0 0 0 ksuspend_usbd
> 0 0 0 aio/0
> 0 0 0 nfsiod
> 0 0 0 crypto/0
> 0 0 0 kpsmoused
> 0 0 0 kstriped
> 0 0 0 kondemand/0
> 0 0 0 usbhid_resumer
> 0 21 21 rpciod/0
>
> After patch:
> # cat [debugfs]/tracing/trace_stat/workqueues
> # CPU INSERTED EXECUTED TASKNAME:PID
> # | | | `-WORKFUNC
> # | | | |
> 0 273 273 events/0:5
> 0 1 1 |-reg_todo+0x0/0x648
> 0 4 4 |-check_corruption+0x0/0x2c
> 0 1 1 |-power_supply_changed_work+0x0/0x3c
> 0 6 6 |-console_callback+0x0/0x145
> 0 229 229 |-vmstat_update+0x0/0x33
> 0 12 12 |-do_cache_clean+0x0/0x6a
> 0 1 1 |-wq_barrier_func+0x0/0x12
> 0 15 15 |-mce_work_fn+0x0/0x31
> 0 3 3 |-rt_worker_func+0x0/0x2de
> 0 1 1 `-grace_ender+0x0/0x14
> 0 0 0 cpuset:6
> 0 659 659 khelper:7
> 0 659 659 `-__call_usermodehelper+0x0/0xa0
> 0 0 0 netns:11
> 0 1818 1818 kblockd/0:13
> 0 1115 1115 |-blk_unplug_work+0x0/0x1e
> 0 703 703 `-cfq_kick_queue+0x0/0x2f
> 0 0 0 kacpid:412
> 0 0 0 kacpi_notify:415
> 0 0 0 ata/0:463
> 0 0 0 ata_aux:509
> 0 0 0 ksuspend_usbd:515
> 0 0 0 aio/0:717
> 0 0 0 nfsiod:764
> 0 0 0 crypto/0:785
> 0 0 0 kpsmoused:1141
> 0 0 0 kstriped:1248
> 0 0 0 kondemand/0:1259
> 0 0 0 usbhid_resumer:1264
> 0 20 20 rpciod/0:1333
> 0 1 1 |-xs_tcp_connect_worker4+0x0/0x1b
> 0 19 19 `-xs_udp_connect_worker4+0x0/0x130



Oh, Nice!
This is an interesting view of worklets percentage/frequency of execution.
We could also have a file per workqueue, but anyway it seems to me a very good
first step!


>
> After this step, we'll begin to add worklet time mesurement support to
> workqueuetrace.


Great!
Thanks.


> Thanks
> Zhaolei
>



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