Messages in this thread | | | Date | Thu, 21 Oct 2010 16:39:12 +0800 | Subject | Re: Ftrace: can trace kthread? | From | Yong Zhang <> |
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On Thu, Oct 21, 2010 at 4:21 PM, Figo.zhang <zhangtianfei@leadcoretech.com> wrote: > On Thu, 2010-10-21 at 16:10 +0800, Yong Zhang wrote: >> On Thu, Oct 21, 2010 at 3:55 PM, Figo.zhang >> <zhangtianfei@leadcoretech.com> wrote: >> > hi, >> > >> > is it ftrace in 2.6.36-rc8 can trace the kthread? >> >> How about the set_ftrace_pid interface? >> > > i try by set_ftrace_pid, it also can't ftrace the kswapd.
Are you sure kswapd got chance to run on your system?
BTW, I can successfully trace bdi_writeback_thread, # tracer: function # # TASK-PID CPU# TIMESTAMP FUNCTION # | | | | | flush-8:0-374 [000] 600743.828496: finish_task_switch <-schedule flush-8:0-374 [000] 600743.828498: perf_event_task_sched_in <-finish_task_switch flush-8:0-374 [000] 600743.828498: del_timer_sync <-schedule_timeout flush-8:0-374 [000] 600743.828499: try_to_del_timer_sync <-del_timer_sync flush-8:0-374 [000] 600743.828499: lock_timer_base <-try_to_del_timer_sync flush-8:0-374 [000] 600743.828499: _spin_lock_irqsave <-lock_timer_base flush-8:0-374 [000] 600743.828500: _spin_unlock_irqrestore <-try_to_del_timer_sync flush-8:0-374 [000] 600743.828500: kthread_should_stop <-bdi_writeback_task
Thanks, Yong
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