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Subject: Re: CFS Bandwidth Control - Test results of cgroups tasks pinned vs
 unpinnede
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Paul Turner <pjt@google.com>,
        Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>,
        Vladimir Davydov <vdavydov@parallels.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Bharata B Rao <bharata@linux.vnet.ibm.com>,
        Dhaval Giani <dhaval.giani@gmail.com>,
        Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>,
        Ingo Molnar <mingo@elte.hu>, Pavel Emelianov <xemul@parallels.com>
Date: Tue, 13 Sep 2011 20:30:46 +0200
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On Tue, 2011-09-13 at 23:58 +0530, Srivatsa Vaddagiri wrote:
> * Peter Zijlstra <a.p.zijlstra@chello.nl> [2011-09-13 20:19:55]:
> 
> > On Tue, 2011-09-13 at 23:24 +0530, Srivatsa Vaddagiri wrote:
> > > We saw considerably high migration count on latest tip compared to
> > > previous kernels. Kamalesh, can you please post the migration count
> > > data? 
> > 
> > Hrmm, yes this looks horrid.. even without cgroup crap, something's funny.
> 
> Yes ..we could visualize that very much in top o/p .. A task's cpu would keep 
> changing *every* screen refresh (refreshed every 0.5 sec that too!).
> 
> We didn't see that with older kernels ..Kamalesh is planning to do a
> git bisect and see which commit lead to this "mad" hopping ..

Awesome, thanks! Btw, what is 'older'? 3.0?