Re: [RFC][PATCH 0/5] Introduce checks for preemptable code forthis_cpu_read/write()

[Christoph Lameter]

On Tue, 20 Sep 2011, Thomas Gleixner wrote:

> > What's the latency hit on those very few locations if we simply put our
> > collective foot down and not support a preemptable version of this_cpu_*()?
> > "Yes, you *could* preempt here, but for our collective sanity that's not
> > supported"...
>
> Full ack.

Latency hit could be very significant in various critical kernel paths.
Especially network subsystem, vm event counters etc.

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