Re: [RFC PATCH 0/2] irq destination caching prototype

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On Mon, Aug 13, 2012 at 12:36:27PM +0300, Gleb Natapov wrote:
> On Mon, Aug 13, 2012 at 12:34:32PM +0300, Michael S. Tsirkin wrote:
> > On Mon, Aug 13, 2012 at 12:16:46PM +0300, Gleb Natapov wrote:
> > > Here is a quick prototype of what we discussed yesterday. This one
> > > caches only MSI interrupts for now. The obvious problem is that not
> > > all interrupts (namely IPIs and MSIs using KVM_CAP_SIGNAL_MSI) use irq
> > > routing table, so they cannot be cached.
> > 
> > I thought this means ID changes need to replace the routing table, no?
> > 
> Correct. This is missing from the patches, but as I said this is just
> prototype to see if it is feasible.
> What this prototype shows is that we
> have problems with IPIs and MSIs from userspace.


I think it's a worthwhile optimization all the same.  When you feel it's
ready, I'm willing to test to see if it helps vhost.


> > > 
> > > Gleb Natapov (2):
> > >   Call irq_rt callback under rcu_read_lock()
> > >   Cache msi irq destination.
> > > 
> > >  arch/x86/kvm/lapic.c     |    2 +-
> > >  include/linux/kvm_host.h |    1 +
> > >  virt/kvm/ioapic.c        |    2 +-
> > >  virt/kvm/ioapic.h        |    3 ++-
> > >  virt/kvm/irq_comm.c      |   37 ++++++++++++++++++++-----------------
> > >  5 files changed, 25 insertions(+), 20 deletions(-)
> > > 
> > > -- 
> > > 1.7.10.4
> 
> --
> 			Gleb.
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