linux-kernel - Re: [PATCH v2] sched: Reduce contention in update_cfs_rq_blocked

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Message-ID: <20140903113242.GO4783@worktop.ger.corp.intel.com>
Date:	Wed, 3 Sep 2014 13:32:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Low <jason.low2@...com>
Cc:	Tim Chen <tim.c.chen@...ux.intel.com>,
	Paul Turner <pjt@...gle.com>, Ingo Molnar <mingo@...nel.org>,
	Ben Segall <bsegall@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sched: Reduce contention in update_cfs_rq_blocked_load

On Tue, Sep 02, 2014 at 12:41:24AM -0700, Jason Low wrote:
> On Mon, 2014-09-01 at 14:55 +0200, Peter Zijlstra wrote:
> > But yes, unbounded errors here are a problem, sure relaxing the updates
> > makes things go fast, they also make things go skew.
> 
> Okay. In that case, would you like to take our original patch which
> avoids unnecessary updates?

This seems a safe patch; yes I'll queue it while we think of smarter
things :-)
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