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[Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers
From: |
Michael S. Tsirkin |
Subject: |
[Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers |
Date: |
Tue, 5 Jan 2010 17:33:08 +0200 |
User-agent: |
Mutt/1.5.19 (2009-01-05) |
On Tue, Jan 05, 2010 at 06:32:09PM +0300, malc wrote:
> On Tue, 5 Jan 2010, Michael S. Tsirkin wrote:
>
> > On Tue, Jan 05, 2010 at 06:23:34PM +0300, malc wrote:
> > > On Tue, 5 Jan 2010, Michael S. Tsirkin wrote:
> > >
> > > > On Mon, Jan 04, 2010 at 05:54:13PM -0600, Anthony Liguori wrote:
> > > > > On 01/04/2010 02:01 PM, Michael S. Tsirkin wrote:
> > > > >> On Mon, Jan 04, 2010 at 02:24:53PM -0600, Anthony Liguori wrote:
> > > > >>
> > > > >>> On 12/21/2009 02:09 AM, Paolo Bonzini wrote:
> > > > >>>
> > > > >>>> Make the timer subsystem register its own bottom half instead of
> > > > >>>> placing the bottom half code in the heart of the main loop. To
> > > > >>>> test if an alarm timer is pending, just check if the bottom half is
> > > > >>>> scheduled.
> > > > >>>>
> > > > >>>> Signed-off-by: Paolo Bonzini<address@hidden>
> > > > >>>>
> > > > >>> I'm not a huge fan of this for a couple reasons. The first is that
> > > > >>> it
> > > > >>> introduces a subtle semantic change. Previously, timers always ran
> > > > >>> before bottom halves whereas after this change, timers may run after
> > > > >>> some bottoms halves but before others. While this should be okay in
> > > > >>> principle, in practice, I'm sure it'll introduce regressions. I'd
> > > > >>> be
> > > > >>> very surprised if cris wasn't affected by this.
> > > > >>>
> > > > >>> But more importantly, I think timer dispatch needs to be part of the
> > > > >>> select loop. malc has a git tree that replaces host alarm timers
> > > > >>> with
> > > > >>> select() timeouts.
> > > > >>>
> > > > >> Where is that tree?
> > > > >>
> > > > >
> > > > > http://repo.or.cz/w/qemu/malc.git mtloop
> > > >
> > > > Don't seem to see anything there.
> > > > malc?
> > >
> > > Yes?
> >
> > Do you have a patch to switch from signals to select? If yes could you
> > tell me where it is so I can test whether it fixes winxp install
> > crashes I see?
>
> All i have is published at:
> http://repo.or.cz/w/qemu/malc.git/shortlog/refs/heads/mtloop
>
> Specifically:
> http://repo.or.cz/w/qemu/malc.git/commit/b99fef4dc2f1ce9d436791b6821cb30e6335ee9b
>
> A small fix is needed to make it run with KVM though.
Hmm, I guess at least iothread needs to be put back for KVM?
--
MST
- Re: [Qemu-devel] [PATCH 11/19] use a bottom half to run timers, Anthony Liguori, 2010/01/04
- Re: [Qemu-devel] [PATCH 11/19] use a bottom half to run timers, Jamie Lokier, 2010/01/04
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, Michael S. Tsirkin, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, Anthony Liguori, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, Michael S. Tsirkin, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, malc, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, Michael S. Tsirkin, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, malc, 2010/01/05
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers,
Michael S. Tsirkin <=
- [Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, malc, 2010/01/05
[Qemu-devel] Re: [PATCH 11/19] use a bottom half to run timers, Paolo Bonzini, 2010/01/05