linux-kernel - Re: [patch v3 5/6] sched, ttwu_queue: queue remote wakeups only when crossing cache domains

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Message-ID: <1323381103.17673.23.camel@twins>
Date:	Thu, 08 Dec 2011 22:51:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Mike Galbraith <efault@....de>, Ingo Molnar <mingo@...e.hu>,
	Venki Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Tim Chen <tim.c.chen@...ux.jf.intel.com>,
	"Shi, Alex" <alex.shi@...el.com>
Subject: Re: [patch v3 5/6] sched, ttwu_queue: queue remote wakeups only
 when crossing cache domains

On Thu, 2011-12-08 at 22:50 +0100, Peter Zijlstra wrote:
> On Thu, 2011-12-08 at 11:34 -0800, Suresh Siddha wrote:
> > On Thu, 2011-12-08 at 01:29 -0800, Peter Zijlstra wrote:
> > > On Wed, 2011-12-07 at 11:20 -0800, Suresh Siddha wrote:
> > > 
> > > > > +DEFINE_PER_CPU(int, sd_top_spr_id);
> > > > 
> > > > pkg_srid (shared resource id)?
> > > 
> > > How about sd_llc{,_id} ?
> > 
> > There is a reason why I didn't mention it ;)
> > 
> > It is not always LLC. In power-savings mode, we group the cores sharing
> > the power-domain (typically the whole package) irrespective of one more
> > multiple LLC's etc.
> > 
> > Anyways, it is just a 

This sending of email stuff is hard..

What I wanted to say is that I consider that an x86 arch bug that needs
fixing.

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