linux-kernel - Re: [libtraceevent] hrtimer_expire

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Date:	Wed, 13 Nov 2013 00:31:52 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [libtraceevent] hrtimer_expire_entry unknown op '{'

On (11/05/13 08:15), Steven Rostedt wrote:
> > Hello,
> > 
> > libtraceevent reports ` unknown op '{' ' while processing hrtimer_expire_entry event
> 
> Yes, we need to port the plugin code from trace-cmd to handle this and
> other cases. It's a known issue.
> 

Hello Steven,
sorry if I'm bothering you with already known issue.

I cloned trace-cmd from
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

and there seems to be problems with hrtimer events format.

# ./trace-cmd check-events
trace-cmd: No such file or directory
  bad op token {
  bad op token {
  bad op token {
  bad op token {
  function is_writable_pte not defined
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  function scsi_trace_parse_cdb not defined
  function jiffies_to_msecs not defined
  function jiffies_to_msecs not defined
  unknown op '{'
  unknown op '{'


trivial strace-ing shows that 'unknown op' comes from hrtimer_expire_entry

stat("/sys/kernel/debug/tracing/events/timer/hrtimer_expire_entry/format", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
open("/sys/kernel/debug/tracing/events/timer/hrtimer_expire_entry/format", O_RDONLY) = 5
read(5, "name: hrtimer_expire_entry\nID: 9"..., 8192) = 577
read(5, "", 8192)                       = 0
close(5)                                = 0
write(2, "  ", 2)                       = 2
write(2, "unknown op '{'", 14)          = 14
write(2, "\n", 1)                       = 1


./trace-cmd record -e timer ls /bin
./trace-cmd report

     kworker/1:0-3925  [001]  1626.266585: hrtimer_cancel:       hrtimer=0xffff880157c8df80
               X-2175  [000]  1626.266585: hrtimer_cancel:       hrtimer=0xffff880157c0df80
               X-2175  [000]  1626.266586: hrtimer_expire_entry: [FAILED TO PARSE] hrtimer=0xffff880157c0df80 now=1625348004324 function=0xffffffff810cadf0
     kworker/1:0-3925  [001]  1626.266586: hrtimer_expire_entry: [FAILED TO PARSE] hrtimer=0xffff880157c8df80 now=1625348004320 function=0xffffffff810cadf0
     kworker/1:0-3925  [001]  1626.266591: hrtimer_expire_exit:  hrtimer=0xffff880157c8df80
     kworker/1:0-3925  [001]  1626.266592: hrtimer_start:        [FAILED TO PARSE] hrtimer=0xffff880157c8df80 function=0xffffffff810cadf0 expires=1625352000000 softexpires=1625352000000
               X-2175  [000]  1626.266593: hrtimer_expire_exit:  hrtimer=0xffff880157c0df80
               X-2175  [000]  1626.266594: hrtimer_start:        [FAILED TO PARSE] hrtimer=0xffff880157c0df80 function=0xffffffff810cadf0 expires=1625352000000 softexpires=1625352000000
     kworker/1:0-3925  [001]  1626.266596: timer_cancel:         timer=0xffff880157c8ff28
     kworker/1:0-3925  [001]  1626.266598: timer_expire_entry:   timer=0xffff880157c8ff28 function=delayed_work_timer_fn now=4295298633
               X-2175  [000]  1626.266599: timer_cancel:         timer=0xffff880157c0ff28
               X-2175  [000]  1626.266599: timer_expire_entry:   timer=0xffff880157c0ff28 function=delayed_work_timer_fn now=4295298633

thank you,

	-ss


> -- Steve
> 
> > 
> > cat /sys/kernel/debug/tracing/events/timer/hrtimer_expire_entry/format
> > 
> > name: hrtimer_expire_entry
> > ID: 91
> > format:
> > 	field:unsigned short common_type;	offset:0;	size:2;	signed:0;
> > 	field:unsigned char common_flags;	offset:2;	size:1;	signed:0;
> > 	field:unsigned char common_preempt_count;	offset:3;	size:1;	signed:0;
> > 	field:int common_pid;	offset:4;	size:4;	signed:1;
> > 
> > 	field:void * hrtimer;	offset:8;	size:8;	signed:0;
> > 	field:s64 now;	offset:16;	size:8;	signed:1;
> > 	field:void * function;	offset:24;	size:8;	signed:0;
> > 
> > print fmt: "hrtimer=%p function=%pf now=%llu", REC->hrtimer, REC->function, (unsigned long long)(((ktime_t) { .tv64 = REC->now }).tv64)
> > 
> > 
> > 	-ss
> 
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