Re: [RFC][PATCH v5 00/14] sched: packing tasks

[Arjan van de Ven]

On 11/11/2013 10:18 AM, Catalin Marinas wrote:

> Even for symmetric configuration, the cost of moving a task to a CPU
> includes wake-up cost plus the run-time cost which depends on the
> P-state after wake-up (that's much trickier since we can't easily
> estimate the cost of a P-state and it may change once you place a task
> on it).

yup including cache refill times (assuming you picked C states
that flushed the cache, which will be the common case... but even
if not, since you're moving at task the likelyhood of cache coldness is high)

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