linux-kernel - Re: [PATCHSET 00/10] perf tools: Support dynamic sort keys for tracepoints (v2)

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Date:	Thu, 17 Dec 2015 16:56:31 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCHSET 00/10] perf tools: Support dynamic sort keys for
 tracepoints (v2)

Hi Arnaldo,

On Wed, Dec 16, 2015 at 09:17:59PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Dec 16, 2015 at 12:35:33AM +0900, Namhyung Kim escreveu:
> > Hello,
> > 
> > This is an attempt to improve perf to deal with tracepoint events
> > better.  The perf tools can handle tracepoint events but perf report
> > on them is less useful since they're always sampled in a fixed
> > location and not provide event specific info.  We can use perf script
> > but I always wishes there's more convenient way to see the result.
> > 
> >  * changes in v2)
> >   - add 'trace' sort key and make it default  (Jiri)
> >   - add '--raw-trace' option and '/raw' field modifier  (Jiri)
> >   - support event name shortcuts  (David)
> 
> Can you take a look if you can reproduce this? Without callchains it works in
> all tests I did.

Argh, it was because I forgot to set raw_data/size field for
--children case.  I'll send the fix soon.

Maybe we can disable --children for tracepoint sessions (or if it
doesn't have symbol sort key)?

Thanks,
Namhyung


> 
> [root@zoo ~]# perf record -g -e kmem:kmalloc -a
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.193 MB perf.data (250 samples) ]
> 
> [root@zoo ~]# perf report
> perf: Segmentation fault
> -------- backtrace --------
> perf[0x539f1b]
> /lib64/libc.so.6(+0x34960)[0x7fc8e3752960]
> perf(pevent_read_number+0x78)[0x542e40]
> perf(pevent_read_number_field+0x70)[0x542ed3]
> /root/.traceevent/plugins/plugin_kmem.so(+0x603)[0x7fc8e1a6c603]
> perf(pevent_event_info+0x96)[0x547597]
> perf[0x4dce26]
> perf[0x4e0e89]
> perf(hist_entry_iter__add+0xee)[0x4e125e]
> perf[0x4304be]
> perf[0x4c2db3]
> perf[0x4c3301]
> perf[0x4c6089]
> perf(perf_session__process_events+0x3f1)[0x4c4b91]
> perf(cmd_report+0x120b)[0x4319cb]
> perf[0x47c871]
> perf(main+0x63f)[0x42242f]
> /lib64/libc.so.6(__libc_start_main+0xf0)[0x7fc8e373dfe0]
> perf[0x422549]
> [0x0]
> [root@zoo ~]# ls -la ~/.traceevent/
> total 12
> drwxr-xr-x.  3 acme acme 4096 May  4  2015 .
> drwx------. 61 acme acme 4096 Dec 16 21:12 ..
> drwxr-xr-x.  2 acme acme 4096 Nov 23 11:15 plugins
> [root@zoo ~]# ls -la ~/.traceevent
> lrwxrwxrwx. 1 root root 23 May  4  2015 /root/.traceevent -> /home/acme/.traceevent/
> [root@zoo ~]# perf record -e sched:sched_switch -a
> 
> 
> ^C[ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.704 MB perf.data (4967 samples) ]
> 
> [root@zoo ~]# perf report
> [root@zoo ~]# perf record -g -e sched:sched_switch -a
> ^C[ perf record: Woken up 2 times to write data ]
> [ perf record: Captured and wrote 2.062 MB perf.data (4743 samples) ]
> 
> [root@zoo ~]# perf report
> perf: Segmentation fault
> -------- backtrace --------
> perf[0x539f1b]
> /lib64/libc.so.6(+0x34960)[0x7fecb3223960]
> perf(pevent_read_number+0x60)[0x542e28]
> perf(pevent_read_number_field+0x70)[0x542ed3]
> perf(get_field_val+0x6b)[0x548cd5]
> perf(pevent_get_field_val+0x6b)[0x548e77]
> /root/.traceevent/plugins/plugin_sched_switch.so(+0x95b)[0x7fecb194195b]
> perf(pevent_event_info+0x96)[0x547597]
> perf[0x4dce26]
> perf[0x4e0e89]
> perf(hist_entry_iter__add+0xee)[0x4e125e]
> perf[0x4304be]
> perf[0x4c2db3]
> perf[0x4c3301]
> perf[0x4c5fdb]
> perf[0x4c3535]
> perf(perf_session__process_events+0x3a0)[0x4c4b40]
> perf(cmd_report+0x120b)[0x4319cb]
> perf[0x47c871]
> perf(main+0x63f)[0x42242f]
> /lib64/libc.so.6(__libc_start_main+0xf0)[0x7fecb320efe0]
> perf[0x422549]
> [0x0]
> [root@zoo ~]# 
> 
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