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

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Message-Id: <1262663058.5748.32.camel@marge.simson.net>
Date:	Tue, 05 Jan 2010 04:44:18 +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 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.

	-Mike

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