Re: [patch v4 01/18] sched: set SD_PREFER_SIBLING on MC domain toreduce a domain level

From: Peter Zijlstra
Date: Tue Feb 12 2013 - 05:11:40 EST

On Thu, 2013-01-24 at 11:06 +0800, Alex Shi wrote:
> The domain flag SD_PREFER_SIBLING was set both on MC and CPU domain at
> frist commit b5d978e0c7e79a, and was removed uncarefully when clear up
> obsolete power scheduler. Then commit 6956dc568 recover the flag on CPU
> domain only. It works, but it introduces a extra domain level since this
> cause MC/CPU different.
> So, recover the the flag in MC domain too to remove a domain level in
> x86 platform.

This fails to clearly state why its desirable.. I'm guessing its because
we should use sibling cache domains before sibling threads, right?

A clearly stated reason is always preferable over: it was this way, make
it so again; which leaves us wondering why.

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