linux-kernel - Re: Scheduler accounting inflated for io bound processes.

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Message-ID: <20130626155048.GA7399@gmail.com>
Date:	Wed, 26 Jun 2013 17:50:48 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mike Galbraith <bitbucket@...ine.de>,
	Dave Chiluk <chiluk@...onical.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: Scheduler accounting inflated for io bound processes.


* Peter Zijlstra <peterz@...radead.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
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