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

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Message-ID: <51CDE273.9080209@intel.com>
Date:	Fri, 28 Jun 2013 22:22:27 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	H Peter Anvin <hpa@...or.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, 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 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.
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