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

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Message-ID: <20070930173340.GA13066@elte.hu>
Date:	Sun, 30 Sep 2007 19:33:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Jackson <pj@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, nickpiggin@...oo.com.au,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	Dinakar Guniguntala <dino@...ibm.com>, cpw@....com
Subject: Re: [PATCH] cpuset and sched domains: sched_load_balance flag


* Paul Jackson <pj@....com> wrote:

> Add a new per-cpuset flag called 'sched_load_balance'.
> 
> When enabled in a cpuset (the default value) it tells the kernel 
> scheduler that the scheduler should provide the normal load balancing 
> on the CPUs in that cpuset, sometimes moving tasks from one CPU to a 
> second CPU if the second CPU is less loaded and if that task is 
> allowed to run there.
> 
> When disabled (write "0" to the file) then it tells the kernel 
> scheduler that load balancing is not required for the CPUs in that 
> cpuset.

i like this, this feature would be quite useful for -rt and CPU 
shielding.

( a cpuset is a mandatory container for set_cpus_allowed(), so there is
  a material and app-visible difference between a 4-CPU cpuset that has 
  balancing disabled and 4x 1-CPU cpusets. )

	Ingo
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