linux-kernel - Re: [sched] 23f0d2093c: -12.6% regression on sparse file copy

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Message-ID: <20140106074928.GB25771@lge.com>
Date:	Mon, 6 Jan 2014 16:49:28 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, lkp@...ux.intel.com
Subject: Re: [sched] 23f0d2093c: -12.6% regression on sparse file copy

On Mon, Jan 06, 2014 at 03:10:07PM +0800, Fengguang Wu wrote:
> Hi Joonsoo,
> 
> On Mon, Jan 06, 2014 at 09:30:52AM +0900, Joonsoo Kim wrote:
> > On Sun, Jan 05, 2014 at 05:04:56PM +0800, fengguang.wu@...el.com wrote:
> > > Hi Joonsoo,
> > > 
> > > We noticed the below changes for commit 23f0d2093c ("sched: Factor out
> > > code to should_we_balance()") in test vm-scalability/300s-lru-file-readtwice
> > 
> > Hello, Fengguang.
> > 
> > There was a mistake in this patch and there was a fix and it was already merged
> > into mainline.
> > 
> > Could you test again with the commit (b0cff9d sched: Fix load balancing
> > performance regression in should_we_balance())?
> 
> Yes, b0cff9d completely restores the performance. Sorry for the noise!

Thanks for quick response. :)

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