Messages in this thread | | | Date | Tue, 20 Sep 2011 09:58:41 -0500 (CDT) | From | Christoph Lameter <> | Subject | Re: [RFC][PATCH 0/5] Introduce checks for preemptable code for this_cpu_read/write() |
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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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