From: "Michael S. Tsirkin" <mst@redhat.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: avi@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH stub] kvm: caching API for interrupts
Date: Sun, 29 Jul 2012 23:29:22 +0300 [thread overview]
Message-ID: <20120729202922.GA13772@redhat.com> (raw)
In-Reply-To: <50159721.4000909@redhat.com>
On Sun, Jul 29, 2012 at 10:03:45PM +0200, Paolo Bonzini wrote:
> Il 29/07/2012 22:00, Michael S. Tsirkin ha scritto:
> > I've been looking at adding caching for IRQs so that we don't need to
> > scan all VCPUs on each interrupt. One issue I had a problem with, is
> > how the cache structure can be used from both a thread (to fill out the
> > cache) and interrupt (to actually send if cache is valid).
> >
> > For now just added a lock field in the cache so we don't need to worry
> > about this, and with such a lock in place we don't have to worry about
> > RCU as cache can be invalidated simply under this lock.
>
> seqlock?
>
> Paolo
AFAIK seqlock only works if uses of stale data have no side-effects,
this is not the case here. We could use an rwlock I think.
--
MST
next prev parent reply other threads:[~2012-07-29 20:28 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-29 20:00 [PATCH stub] kvm: caching API for interrupts Michael S. Tsirkin
2012-07-29 20:03 ` Paolo Bonzini
2012-07-29 20:29 ` Michael S. Tsirkin [this message]
2012-07-30 6:57 ` Paolo Bonzini
2012-07-30 7:09 ` Gleb Natapov
2012-07-30 8:34 ` Avi Kivity
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