linux-kernel - Re: "Cache" sched domains

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Date:	Thu, 16 Jun 2011 15:20:32 +0200
From:	Samuel Thibault <samuel.thibault@...-lyon.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Heiko Carstens <heiko.carstens@...ibm.com>
Subject: Re: "Cache" sched domains

Hello,

Peter Zijlstra, le Thu 16 Jun 2011 14:27:22 +0200, a écrit :
> On Thu, 2011-06-16 at 14:11 +0200, Samuel Thibault wrote:
> > ┌──────────────────────────────────────────────────────────────────┐
> > │Socket P#1                                                        │
> > │┌────────────────────────────────────────────────────────────────┐│
> > ││L3 (16MB)                                                       ││
> > │└────────────────────────────────────────────────────────────────┘│
> > │┌────────────────────┐┌────────────────────┐┌────────────────────┐│
> > ││L2 (3072KB)         ││L2 (3072KB)         ││L2 (3072KB)         ││
> > │└────────────────────┘└────────────────────┘└────────────────────┘│
> > │┌─────────┐┌─────────┐┌─────────┐┌─────────┐┌─────────┐┌─────────┐│
> > ││L1 (32KB)││L1 (32KB)││L1 (32KB)││L1 (32KB)││L1 (32KB)││L1 (32KB)││
> > │└─────────┘└─────────┘└─────────┘└─────────┘└─────────┘└─────────┘│
> > │┌─────────┐┌─────────┐┌─────────┐┌─────────┐┌─────────┐┌─────────┐│
> > ││Core P#0 ││Core P#1 ││Core P#2 ││Core P#3 ││Core P#4 ││Core P#5 ││
> > ││┌───────┐││┌───────┐││┌───────┐││┌───────┐││┌───────┐││┌───────┐││
> > │││PU P#0 ││││PU P#4 ││││PU P#8 ││││PU P#12││││PU P#16││││PU P#20│││
> > ││└───────┘││└───────┘││└───────┘││└───────┘││└───────┘││└───────┘││
> > │└─────────┘└─────────┘└─────────┘└─────────┘└─────────┘└─────────┘│
> > └──────────────────────────────────────────────────────────────────┘
> 
> Pretty, bonus points for effort there.

Well, that's all hwloc's credit :)

> So the current goal is to change sched_domain_topology to not be such a
> silly hard coded list of domains, but build that thing dynamically based
> on the system topology and set all the SD_flags correctly.

Ok, great!

> If that is something you're willing to work on, that'd be totally
> awesome.

I'm afraid I do not have time to spend on this.

Samuel
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