linux-kernel - Re: [libtraceevent] hrtimer_expire

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Date:	Tue, 12 Nov 2013 16:52:37 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [libtraceevent] hrtimer_expire_entry unknown op '{'

On Wed, 13 Nov 2013 00:31:52 +0300
Sergey Senozhatsky <sergey.senozhatsky@...il.com> wrote:

> 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

Do a make install, or copy all the *.so files into ~/.trace-cmd/plugins/
and that will go away.

-- Steve

>   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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