On 11/28/2013 01:31 PM, Paolo Bonzini wrote:
Il 28/11/2013 12:23, Gleb Natapov ha scritto:
Unless what ? :) Unless reader is scheduled out?
Yes. Or unless my brain is scheduled out in the middle of a sentence.
So we will have to disable preemption in a reader to prevent big latencies for
a writer, no?
I don't think that's necessary. The writer itself could also be
scheduled out, and the reader critical sections are really small. Let's
wait for Zhang to try SRCU and report back.
I think readers have preemption disabled already in that context (irqfd
writes).
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