linux-kernel - Re: [RFC][PATCH 00/14] Rewrite sched_domain/sched

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Date:	Fri, 25 Mar 2011 22:46:41 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Anton Blanchard <anton@....ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Paul Turner <pjt@...gle.com>, Mike Galbraith <efault@....de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH 00/14] Rewrite sched_domain/sched_group creation

On Mon, 2011-03-14 at 16:06 +0100, Peter Zijlstra wrote:
> So I got annoyed with the whole sched_domain/sched_group creation mess again
> and decided to actuall do something about it. See here ;-)
> 
> Its not completely done yet, but much of the ground-work is there.
> 
> The final goal is to be able to have a simple way to dynamically specify the
> architecture topoplogy and have the generic code in charge of building the data
> structures. The architecture would need to provide a function that maps a cpu
> to a cpumask and a function that initializes the sched_domain (flags etc.),
> this would replace the now still hard-coded __build_*_sched_domain() calls in
> __build_sched_domains().

Got to here last friday a week ago, and started on:

> With that we can also kill the current NODE and ALLNODES mess and generate
> appropriate masks from say the ACPI SLIT table by grouping CPUs on their node
> distance.

which I just finished.

> This would allow us to kill the horrid mess in x86's cpu_coregroup_mask() and
> properly support the AMD magnycours stuff.

Still todo.

> Anyway, not quite there yet.. patches build and boot on a 2*6*2 wsm box.

Still boots, although a 2 node system isn't very interesting.

I pushed out an updated version to:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-sched.git sched_domain

we're now at:

 include/linux/sched.h    |   26 +-
 include/linux/topology.h |   25 -
 kernel/cpuset.c          |    2 +-
 kernel/sched.c           | 1094 ++++++++++++++++------------------------------
 kernel/sched_fair.c      |   32 +-
 5 files changed, 407 insertions(+), 772 deletions(-)



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