linux-kernel - Re: [PATCH 4/5] sched: Refactor iowait accounting

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Message-ID: <20131019162011.GB13534@localhost.localdomain>
Date:	Sat, 19 Oct 2013 18:20:12 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Fernando Luis Vazquez Cao <fernando_b1@....ntt.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 4/5] sched: Refactor iowait accounting

On Sat, Oct 19, 2013 at 06:05:17PM +0200, Peter Zijlstra wrote:
> On Sat, Oct 19, 2013 at 06:02:37PM +0200, Frederic Weisbecker wrote:
> > > I just had a look at delayacct; wth wrote that crap; that too uses
> > > gtod.
> > 
> > I can't find where it does that. kernel/delayacct.c doesn't seem to at least.
> 
> Look for do_posix_clock_monotonic_gettime() ;-)

Oh. Well that's a good news, it appears to be a nice low hanging fruit :)

Also perhaps we could make it use the same timestamp as cpu_iowait_start/end.
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