Messages in this thread | | | Subject | Re: [RFC PATCH v1 1/2] sched: unified sched_powersavings sysfs tunable | From | Peter Zijlstra <> | Date | Thu, 26 Jan 2012 12:08:11 +0100 |
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On Thu, 2012-01-26 at 11:42 +0100, Jens Axboe wrote: > On 01/25/2012 03:53 PM, Peter Zijlstra wrote:
> > Jens, what is this thing trying to do? > >The intent of the code > is to return the first CPU in the "group" that the passed in core/thread > belongs to. This is used to decide whether to perform a completion > locally, or to send it off to a different "group".
Would you perhaps have meant to identify some shared cache domain?
In the scheduler core code we have (for CONFIG_SMP):
static int ttwu_share_cache(int this_cpu, int that_cpu);
which returns true if this and that share a cache and false otherwise. Would that suffice or do you need a slightly different form? That is, we should provide you with some API and avoid you having to poke around with CONFIG_SCHED* and topology bits methinks.
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