linux-kernel - Re: [PATCH v2 4/4] clock: add perf

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Message-ID: <20150218175354.GA31963@gmail.com>
Date:	Wed, 18 Feb 2015 18:53:54 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	jolsa@...hat.com, namhyung@...nel.org, cel@...ibm.com,
	sukadev@...ux.vnet.ibm.com, sonnyrao@...omium.org,
	johnmccutchan@...gle.com, dsahern@...il.com,
	adrian.hunter@...el.com, pawell.moll@....com
Subject: Re: [PATCH v2 4/4] clock: add perf_clock posix clock


* Stephane Eranian <eranian@...gle.com> wrote:

> This patch is a re-packaging of David's Ahern
> posix perf clock available here:
> 
> 	https://github.com/dsahern/linux/blob/perf-full-monty/README.ahern
> 
> The patch itself is based on Pawel Moll's original post:
> 
> 	https://lkml.org/lkml/2013/3/14/523
> 
> The new clock is call PERF_CLOCK. To use it
> 
> 	#include <time.h>
> 	#include <linux/time.h>
> 
> 	struct timespec ts;
> 
> 	clock_gettime(PERF_CLOCK, &ts);

So what's the justification for this new clock, as opposed 
to say CLOCK_MONOTONIC?

Thanks,

	Ingo
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