linux-kernel - Re: [PATCH] cpuset and sched domains: sched_load

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Message-Id: <20071003051438.e1371e99.pj@sgi.com>
Date:	Wed, 3 Oct 2007 05:14:38 -0700
From:	Paul Jackson <pj@....com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	akpm@...ux-foundation.org, menage@...gle.com,
	linux-kernel@...r.kernel.org, dino@...ibm.com, cpw@....com,
	mingo@...e.hu
Subject: Re: [PATCH] cpuset and sched domains: sched_load_balance flag

> These are what I'm worried about, and things like kswapd, pdflush,
> could definitely use a huge amount of CPU.
> 
> If you are interested in hard partitioning the system, you most
> definitely want these things to be balanced across the non-isolated
> CPUs.

But these guys are pinned anyway (or else they would already be moved
into a smaller load balanced cpuset), so why waste time load balancing
what can't move?

And on some of the systems I care about, we don't want to load balance
these guys; rather we go to great lengths to see that they don't run at
all when we don't want them to.

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