linux-kernel - Re: [RFC] perf record: missing buildid for callstack modules

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Message-ID: <20160113102501.GB9644@gmail.com>
Date:	Wed, 13 Jan 2016 11:25:02 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Namhyung Kim <namhyung@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [RFC] perf record: missing buildid for callstack modules


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, Jan 12, 2016 at 11:34:54AM -0300, Arnaldo Carvalho de Melo wrote:
>
> > Have you ever played, when you noticed those overheads, with -N? Or just used 
> > the -B big hammer and moved on?
> 
> I yelled on irc, jolsa told me to use -B, I moved on ;-)

So I think we should grow mtime protection, to not display incorrect data - and 
then that should become the default. (in addition to per CPU recording threads.)

Way too slow recording is something I experience as well - and to have a slow 
_performance_ profiling tool is pretty ironic! ;-)

Thanks,

	Ingo