Re: [PATCH V2 Resend 0/4] Create sched_select_cpu() and use it forworkqueues and timers

[Steven Rostedt]

On Mon, 2012-11-26 at 09:03 -0800, Paul E. McKenney wrote:


> If I understand correctly (though also suffering turkey OD), the idea is
> to offload work to more energy-efficient CPUs.

This is determined by a CPU that isn't running the idle task? Is it
because a CPU that just woke up may be running at a lower freq, and thus
not as efficient? But pushing off to another CPU may cause cache misses
as well. Wouldn't that also be a factor in efficiencies, if a CPU is
stalled waiting for memory to be loaded?

I should also ask the obvious. Has these patches shown real world
efficiencies or is this just a theory? Do these patches actually improve
battery life when applied?

Just asking.

-- Steve


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/