linux-kernel - Re: [PATCH 0/9] perf: Adding better precise

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Message-ID: <20130127130259.GC3933@gmail.com>
Date:	Sun, 27 Jan 2013 14:02:59 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 0/9] perf: Adding better precise_ip field handling


* Jiri Olsa <jolsa@...hat.com> wrote:

> On Sun, Jan 27, 2013 at 01:41:33PM +0100, Ingo Molnar wrote:
> > 
> > * Jiri Olsa <jolsa@...hat.com> wrote:
> > 
> > > hi,
> > > adding sysfs attribute to specify the maximum allowed value
> > > for perf_event_attr::precise_ip field.
> > > 
> > > Adding functionality for simple 'precise' term to get the
> > > maximum allowed value for perf_event_attr::precise_ip field.
> > > 
> > > And finally adding several precise automated tests.
> > 
> > Ok - could we please as a next step turn on cycles:pp as the 
> > default in all the profiling tools (perf record, perf top), 
> > transparently? I.e. if the CPU supports it then use it, if not 
> > then don't complain, just use the highest grade profiling method 
> > available.
> 
> yep, we discussed with Arnaldo this would be good to have

This would be a high-profile, user visible improvement to 
profiling quality.

Thanks,

	Ingo
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