From: Ingo Molnar <mingo@kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <bitbucket@online.de>,
Dave Chiluk <chiluk@canonical.com>,
Ingo Molnar <mingo@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: Scheduler accounting inflated for io bound processes.
Date: Wed, 26 Jun 2013 17:50:48 +0200 [thread overview]
Message-ID: <20130626155048.GA7399@gmail.com> (raw)
In-Reply-To: <20130626104243.GE28407@twins.programming.kicks-ass.net>
* Peter Zijlstra <peterz@infradead.org> wrote:
> On Wed, Jun 26, 2013 at 11:37:13AM +0200, Ingo Molnar wrote:
> > Would be very nice to randomize the sampling rate, by randomizing the
> > intervals within a 1% range or so - perf tooling will probably recognize
> > the different weights.
>
> You're suggesting adding noise to the regular kernel tick?
No, to the perf interval (which I assumed Mike was using to profile this?)
- although slightly randomizing the kernel tick might make sense as well,
especially if it's hrtimer driven and reprogrammed anyway.
I might have gotten it all wrong though ...
Thanks,
Ingo
next prev parent reply other threads:[~2013-06-26 15:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-20 19:46 Scheduler accounting inflated for io bound processes Dave Chiluk
2013-06-25 16:01 ` Mike Galbraith
2013-06-25 17:48 ` Mike Galbraith
2013-06-26 9:37 ` Ingo Molnar
2013-06-26 10:42 ` Peter Zijlstra
2013-06-26 15:50 ` Ingo Molnar [this message]
2013-06-26 16:01 ` Mike Galbraith
2013-06-26 16:04 ` David Ahern
2013-06-26 16:10 ` Ingo Molnar
2013-06-26 16:13 ` David Ahern
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