On Fri, Sep 14, 2012 at 2:56 PM, Peter Zijlstra <a.p.zijls...@chello.nl> wrote:
>
> Both things change semantics, not looking at the entire package is new
> too.
Well, the "idle_buddy" thing on its own could be considered to be
purely a caching thing.
Sure, it doesn't take tsk_cpus_allowed() into account while setting up
the cache (since it's not dynamic enough), but *assuming* the common
case is that people let threads be on any of the cores of a package,
it should be possible to make the cache 100% equivalent with no
semantic change. No?
The code doesn't even try to do that kind of "don't change semantics",
though, and makes the idle-buddy thing entirely different.
Linus
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