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

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Date:	Mon, 04 Jan 2010 10:32:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lin Ming <ming.m.lin@...el.com>
Cc:	Mike Galbraith <efault@....de>,
	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 Mon, 2010-01-04 at 17:12 +0800, Lin Ming wrote:
> On Mon, 2010-01-04 at 17:25 +0800, Peter Zijlstra 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.
> > >     
> > 
> > Does this at all help with that regression?
> 
> No.

crap :/

The change does look sensible though.

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