linux-kernel - Re: [PATCH 5/9] perf tools: Introduce 'P' modifier

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Date:	Mon, 5 Oct 2015 16:08:51 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"Liang, Kan" <kan.liang@...el.com>, Don Zickus <dzickus@...hat.com>
Subject: Re: [PATCH 5/9] perf tools: Introduce 'P' modifier

Em Mon, Oct 05, 2015 at 08:38:06PM +0200, Jiri Olsa escreveu:
> On Mon, Oct 05, 2015 at 12:13:48PM -0600, David Ahern wrote:
> > On 10/5/15 12:06 PM, Jiri Olsa wrote:
> > >The 'P' will cause the event to get maximum possible detected precise
> > >level.

> > >Following record:
> > >   $ perf record -e cycles:P ...

> > >will detect maximum precise level for 'cycles' event
> > >and use it.

> > Does the end result (which precise level is used) get saved to the header
> > and displayed to the user properly?

> yep..
 
> [jolsa@...va perf]$ ./perf record -e cycles:P ls
 
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.014 MB perf.data (8 samples) ]
> [jolsa@...va perf]$ ./perf evlist
> cycles:P
> [jolsa@...va perf]$ ./perf evlist -v
> cycles:P: size: 112, ...  precise_ip: 2  ...

[root@zoo ~]# perf record usleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.016 MB perf.data (12 samples) ]
[root@zoo ~]# perf evlist
cycles:pp
[root@zoo ~]# perf evlist -v
cycles:pp: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 2, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
[root@zoo ~]#

- Arnaldo
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