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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table |
Date: | Thu, 28 Nov 2013 13:33:17 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.1.0 |
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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