linux-kernel - Re: [patch] sched: fix sched-domains partitioning by cpusets

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Message-Id: <20071003030838.e99bf3a0.pj@sgi.com>
Date:	Wed, 3 Oct 2007 03:08:38 -0700
From:	Paul Jackson <pj@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	mingo@...e.hu, akpm@...ux-foundation.org, menage@...gle.com,
	linux-kernel@...r.kernel.org, dino@...ibm.com, cpw@....com
Subject: Re: [patch] sched: fix sched-domains partitioning by cpusets

Nick, responding to pj, wrote:
> >     However a little bit of additional kernel cpuset code could hide
> >     this detail from user space, by recognizing when the user had
> >     asked to turn off load balancing on some larger cpuset, and by
> >     then calling partition_sched_domains() multiple times, once for
> >     each CPU in that cpuset.
> 
> Yeah: do all that in cpusets. It's already information you would have
> to derive in order to make it work properly anyway. If you are not
> passing in the singleton domains ATM, then they will not get properly
> detached and isolated.

ok

> It's not a huge deal, but I'd like to keep partition_sched_domains. After
> my patch, it's really simple.

ok

It's a deal.

I've got a couple of brown paper bag bug fixes almost ready to send
out, for the patch I sent Andrew a few days ago:

  cpuset and sched domains: sched_load_balance flag

I'll send these in, and then get some sleep and code up these changes
to the partition_sched_domains, along the lines you have recommended.

Thanks, Nick and Ingo.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@....com> 1.925.600.0401
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