linux-kernel - Re: rcu stalls seen with numasched

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Message-ID: <20120807165932.GA3850@linux.vnet.ibm.com>
Date:	Tue, 7 Aug 2012 22:29:32 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	John Stultz <johnstul@...ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: rcu stalls seen with numasched_v2 patches applied.

* John Stultz <johnstul@...ibm.com> [2012-08-07 10:08:51]:

> On 08/07/2012 05:33 AM, Srikar Dronamraju wrote:
> >Hi,
> >
> >I saw this while I was running the 2nd August -tip kernel +  Peter's
> >numasched patches.
> >
> >Top showed load average to be 240, there was one cpu (cpu 7) which
> >showed 100% while all other cpus were idle.  The system showed some
> >sluggishness. Before I saw this I ran Andrea's autonuma benchmark couple
> >of times.
> >
> >I am not sure if this is an already reported issue/known issue.
> So Ingo pushed a fix the other day that might address this:
> http://git.linaro.org/gitweb?p=people/jstultz/linux.git;a=commitdiff_plain;h=1d17d17484d40f2d5b35c79518597a2b25296996

Okay, will update after applying the patch.

> 
> But do let me know any reproduction details if you can trigger this
> again.  If you do trigger it again without that patch, watch to see
> if the time value from date is running much faster then it should.
> 

The time value from date is normal

-- 
Thanks and Regards
Srikar

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