linux-kernel - Re: Perf record format portability

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Date:	Tue, 29 May 2012 12:10:20 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Dmitry Antipov <dmitry.antipov@...aro.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: Perf record format portability

Em Fri, May 18, 2012 at 09:48:26AM +0400, Dmitry Antipov escreveu:
> On 05/17/2012 03:48 PM, Steven Rostedt wrote:
> 
> >trace-cmd copies the entire /sys/kernel/debug/tracing/events directory
> >into the data file (well it copies only the events you specify).
> >I thought perf did the same. It should be using what's in the perf.dat
> >file and not what's on the host.
> 
> I found that 'perf script' and 'perf report' works differently,
> and I suppose 'perf script' is correct and 'perf report' isn't.
> 
> What I'm doing on PC host is:

I haven't tested this, but libtraceevent is now in, perhaps it works for
you now? Can you check?

- Arnaldo
 
> 1) Collect data with:
>    perf record -a -R -f -m 8192	-c 1 -e sched:sched_switch \
> 	-e sched:sched_process_exit -e sched:sched_process_fork \
> 	-e sched:sched_wakeup -e sched:sched_migrate_task [task]
> 2) Collect an output from 'perf script' and 'perf report', both looks
>    great.
> 3) Copy perf.data and contents of /proc/kallsyms to ARM target.
> 
> 4) Next, on ARM target:
>    perf script --kallsyms=[kallsyms from PC host] -i [perf.data from PC host]
>    Looks good, all event names like 'sched_wakeup' or 'sched_switch' are shown.
> 5) Try:
>    perf report --kallsyms=[kallsyms from PC host] -i [perf.data from PC host] --stdio
>    All event names are shown as 'unknown:unknown'.
> 
> "Cross-replaying" (perf sched replay) looks broken too.
> Host results are:
> 
> run measurement overhead: 260 nsecs
> sleep measurement overhead: 56109 nsecs
> the run test took 1000054 nsecs
> the sleep test took 1076170 nsecs
> nr_run_events:        246
> nr_sleep_events:      257
> nr_wakeup_events:     123
> target-less wakeups:  27
> task      0 (           <unknown>:      3440), nr_events: 33
> task      1 (         kworker/0:0:      3227), nr_events: 15
> task      2 (           <unknown>:         0), nr_events: 125
> task      3 (     plugin-containe:      1769), nr_events: 13
> task      4 (         ksoftirqd/0:         3), nr_events: 5
> task      5 (         kworker/2:2:      2023), nr_events: 3
> task      6 (                perf:      3441), nr_events: 200
> task      7 (         migration/2:      3091), nr_events: 3
> task      8 (         kworker/1:0:      3104), nr_events: 158
> task      9 (               urxvt:      2952), nr_events: 95
> task     10 (         ksoftirqd/2:      3093), nr_events: 3
> ------------------------------------------------------------
> #1  : 70.193, ravg: 70.19, cpu: 116.57 / 116.57
> #2  : 70.607, ravg: 70.23, cpu: 116.61 / 116.58
> #3  : 70.411, ravg: 70.25, cpu: 116.69 / 116.59
> #4  : 70.386, ravg: 70.27, cpu: 116.72 / 116.60
> #5  : 70.222, ravg: 70.26, cpu: 116.39 / 116.58
> #6  : 70.361, ravg: 70.27, cpu: 116.40 / 116.56
> #7  : 70.409, ravg: 70.28, cpu: 116.43 / 116.55
> #8  : 70.368, ravg: 70.29, cpu: 116.50 / 116.55
> #9  : 70.604, ravg: 70.32, cpu: 116.75 / 116.57
> #10 : 70.578, ravg: 70.35, cpu: 116.79 / 116.59
> 
> Cross-replaying attempt is ('perf sched -i [perf.data from PC host] replay'):
> 
> run measurement overhead: 8099 nsecs
> sleep measurement overhead: 159428 nsecs
> the run test took 998913 nsecs
> the sleep test took 1188048 nsecs
> nr_run_events:        0
> nr_sleep_events:      0
> nr_wakeup_events:     0
> ------------------------------------------------------------
> #1  : 0.058, ravg: 0.06, cpu: 0.00 / 0.00
> #2  : 0.105, ravg: 0.06, cpu: 0.00 / 0.00
> #3  : 0.027, ravg: 0.06, cpu: 0.00 / 0.00
> #4  : 0.026, ravg: 0.06, cpu: 0.00 / 0.00
> #5  : 0.035, ravg: 0.05, cpu: 0.00 / 0.00
> #6  : 0.027, ravg: 0.05, cpu: 0.00 / 0.00
> #7  : 0.027, ravg: 0.05, cpu: 0.00 / 0.00
> #8  : 0.028, ravg: 0.05, cpu: 0.00 / 0.00
> #9  : 0.029, ravg: 0.04, cpu: 0.00 / 0.00
> #10 : 0.028, ravg: 0.04, cpu: 0.00 / 0.00
> 
> Dmitry
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