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

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Date:	Mon, 5 Oct 2015 20:38:06 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	David Ahern <dsahern@...il.com>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...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

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  ...

[jolsa@...va perf]$ ./perf report --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 8  of event 'cycles:P'
# Event count (approx.): 4270406
#
# Overhead  Command  Shared Object     Symbol                    
...


jirka
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