linux-kernel - Re: [RFC PATCH] sched: Pass affine target cpu into wake

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Date:	Thu, 07 Jan 2010 10:33:27 +0100
From:	Mike Galbraith <efault@....de>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	lkml <linux-kernel@...r.kernel.org>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [RFC PATCH] sched: Pass affine target cpu into wake_affine

On Thu, 2010-01-07 at 16:45 +0800, Lin Ming wrote:
> On Tue, 2010-01-05 at 14:43 +0800, Mike Galbraith wrote:
> > On Tue, 2010-01-05 at 04:44 +0100, Mike Galbraith wrote:
> > > On Tue, 2010-01-05 at 10:48 +0800, Lin Ming wrote:
> > > > On Mon, 2010-01-04 at 17:03 +0800, Lin Ming wrote:
> > > > > commit a03ecf08d7bbdd979d81163ea13d194fe21ad339
> > > > > Author: Lin Ming <ming.m.lin@...el.com>
> > > > > Date:   Mon Jan 4 14:14:50 2010 +0800
> > > > > 
> > > > >     sched: Pass affine target cpu into wake_affine
> > > > >     
> > > > >     Since commit a1f84a3(sched: Check for an idle shared cache in select_task_rq_fair()),
> > > > >     the affine target maybe adjusted to any idle cpu in cache sharing domains
> > > > >     instead of current cpu.
> > > > >     But wake_affine still use current cpu to calculate load which is wrong.
> > > > >     
> > > > >     This patch passes affine cpu into wake_affine.
> > > > >     
> > > > >     Signed-off-by: Lin Ming <ming.m.lin@...el.com>
> > > > 
> > > > Mike,
> > > > 
> > > > Any comment of this patch?
> > > 
> > > The patch definitely looks like the right thing to do, but when I tried
> > > this, it didn't work out well.  Since I can't seem to recall precise
> > > details, I'll let my box either remind me or give it's ack.
> > 
> > Unfortunately, box reminded me.  mysql+oltp peak throughput with
> > nr_clients == nr_cpus
> 
> Did you test with your vmark regression fix patch also applied?

Yeah.  Delta between tested kernels was your patch.

	-Mike

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