linux-kernel - Re: [RFC] sched_clock: Track monotonic raw clock

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Message-ID: <1406045838.25343.70.camel@hornet>
Date:	Tue, 22 Jul 2014 17:17:18 +0100
From:	Pawel Moll <pawel.moll@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Andy Lutomirski <luto@...capital.net>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Baruch Siach <baruch@...s.co.il>,
	Thomas Gleixner <tglx@...utronix.de>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] sched_clock: Track monotonic raw clock

On Fri, 2014-07-18 at 20:34 +0100, Peter Zijlstra wrote:
> On Fri, Jul 18, 2014 at 12:25:48PM -0700, John Stultz wrote:
> > Also, assuming we someday will merge the x86 sched_clock logic into
> > the generic sched_clock code, we'll have to handle cases where they
> > aren't the same.
> 
> I prefer that to not happen. I spend quite a bit of time and effort to
> make the x86 code go fast, and that generic code doesn't look like fast
> at all.

Actually one of my long-ish time goals to is to speed it up (withing the
generic framework) for arm64 as well, so we may get back to the
discussion then :-)

Pawel

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