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Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update v


From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC] create a single workqueue for each vm to update vm irq routing table
Date: Thu, 28 Nov 2013 12:10:40 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9

Il 28/11/2013 12:09, Gleb Natapov ha scritto:
> > - if there are no callbacks, but there are readers, synchronize_srcu
> > busy-loops for some time checking if the readers complete.  After a
> > while (20 us for synchronize_srcu, 120 us for
> > synchronize_srcu_expedited) it gives up and starts using a workqueue to
> > poll every millisecond.  This should never happen unless
> 
> Unless what ? :) Unless reader is scheduled out?

Yes.  Or unless my brain is scheduled out in the middle of a sentence.

Paolo



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