From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Oleg Nesterov <oleg@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Fernando Luis Vazquez Cao <fernando_b1@lab.ntt.co.jp>,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Arjan van de Ven <arjan@linux.intel.com>
Subject: Re: [PATCH 4/5] sched: Refactor iowait accounting
Date: Sat, 19 Oct 2013 18:20:12 +0200 [thread overview]
Message-ID: <20131019162011.GB13534@localhost.localdomain> (raw)
In-Reply-To: <20131019160517.GB2490@laptop.programming.kicks-ass.net>
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.
next prev parent reply other threads:[~2013-10-19 16:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-19 15:17 [RFC PATCH 0/5] nohz: Fix racy sleeptime stats v2 Frederic Weisbecker
2013-10-19 15:17 ` [PATCH 1/5] nohz: Convert a few places to use local per cpu accesses Frederic Weisbecker
2013-10-19 15:17 ` [PATCH 2/5] nohz: Only update sleeptime stats locally Frederic Weisbecker
2013-10-19 15:17 ` [PATCH 3/5] timer: Change idle/iowait accounting semantics Frederic Weisbecker
2013-10-20 7:34 ` Andreas Mohr
2013-11-04 16:22 ` Frederic Weisbecker
2013-10-19 15:17 ` [PATCH 4/5] sched: Refactor iowait accounting Frederic Weisbecker
2013-10-19 15:35 ` Peter Zijlstra
2013-10-19 16:02 ` Frederic Weisbecker
2013-10-19 16:05 ` Peter Zijlstra
2013-10-19 16:20 ` Frederic Weisbecker [this message]
2013-10-20 11:10 ` Andreas Mohr
2013-11-04 17:34 ` Frederic Weisbecker
2013-11-04 18:38 ` Andreas Mohr
2013-10-19 15:17 ` [PATCH 5/5] nohz: Synchronize sleep time stats with seqlock Frederic Weisbecker
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