linux-kernel - Re: [PATCH v3 1/3] perf: Use monotonic clock as a source for timestamps

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Message-ID: <20141104153009.GJ10501@worktop.programming.kicks-ass.net>
Date:	Tue, 4 Nov 2014 16:30:09 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Richard Cochran <richardcochran@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Christopher Covington <cov@...eaurora.org>,
	Namhyung Kim <namhyung@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tomeu Vizoso <tomeu@...euvizoso.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Subject: Re: [PATCH v3 1/3] perf: Use monotonic clock as a source for
 timestamps

On Tue, Nov 04, 2014 at 03:25:27PM +0000, Pawel Moll wrote:
> Very good idea, should have came up with it myself :-)
> 
> Does __setup("perf_use_local_clock") sound reasonable?

Would not the 'module' already prefix a perf.? I never quite know how
all that works out. But sure, that works.

> Then we have to
> decide whether to hide the sysctl "perf_sample_time_clk_id" (my
> preferred option, will see how difficult it is) or just provide an
> invalid clock_id (eg. -1) in it.

invalid clock id is fine with me, although I suppose the clock people
might have an oh-pinion ;-)
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