Re: [this_cpu_xx V5 19/19] SLUB: Experimental new fastpath w/ointerrupt disable

[Christoph Lameter]

On Wed, 7 Oct 2009, Mathieu Desnoyers wrote:

> You are already calling the scheduler when ending the _fast_ path. I
> don't see the problem with calling it when you end the slow path
> execution.

Well yes that gives rise to the thought of using

	preempt_enable_no_sched()

at the end of the fastpath as well. Constant calls into the scheduler
could be a major performance issue. I dont notice it here since I usually
cannot affort the preempt overhead and build kernels without support for
it.


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