linux-kernel - Re: [PATCH 0/5] perf: add two new features

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Message-ID: <20130716143429.GK23818@dyad.programming.kicks-ass.net>
Date:	Tue, 16 Jul 2013 16:34:29 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/5] perf: add two new features

On Tue, Jul 16, 2013 at 09:22:00AM +0300, Adrian Hunter wrote:
> On 28/06/13 22:22, Adrian Hunter wrote:
> > On 28/06/2013 6:27 p.m., Peter Zijlstra wrote:
> >> On Fri, Jun 28, 2013 at 04:22:16PM +0300, Adrian Hunter wrote:
> >>> Hi
> >>>
> >>> Please consider these two new perf features:
> >>>        x86: add ability to calculate TSC from perf sample timestamps
> >>>        perf: add 'keep tracking' flag to PERF_EVENT_IOC_DISABLE
> >>
> >> Please explain to us why you'd like to do this..
> > 
> > I will see what information I can dig up.  The short answer is that I need
> > to disable and re-enable a perf event but still be able to map IPs to their
> > DSOs and symbols - which means not losing mmap events.
> 
> Any other comments?

Ah, thanks for the reminder.. well, I've applied patches 1-3 as those seem
useful on their own. I'm not entirely convinced about the 'keep tracking' thing
though.

It seems to me you could get the same by opening a second event into the same
buffer and keeping that enabled.
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