Re: [PATCH 2.6.13-rc6] cpu_exclusive sched domains on partial nodes temp fix

Dinakar Guniguntala
2005-08-23T15:19:57Z

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On Tue, Aug 23, 2005 at 01:04:27AM -0700, Paul Jackson wrote:
> If Dinakar, Hawkes and Nick concur (and no one else complains too
> loud) then the following should go into 2.6.13, to avoid the potential
> kernel oops that Hawkes reported in Dinakar's feature to allow user
> control of dynamic sched domain placement using cpu_exclusive cpusets.

I agree this is the way to go for 2.6.13 before we fix things the
right way for 2.6.14. Thanks for the patch Paul.

> This patch should allow proceeding with this new feature in 2.6.13 for
> the configurations in which it is useful (node alligned sched domains)
> while avoiding trying to setup sched domains in the less useful cases
> that can cause the kernel corruption and oops.
>

Dunno if it is something in my setup (4 CPU Power5 box with NUMA enabled)
but this patch causes some hard hangs when I run the attached script.
The same script runs for much longer with Ingo's changes but panics
as I had described earlier. I am still debugging what causes this.

-Dinakar

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