From: Marcelo Tosatti <mtosatti@redhat.com>
To: Paul Brook <paul@codesourcery.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [patch 1/2] qemu: sem/thread helpers
Date: Wed, 11 Mar 2009 13:58:34 -0300 [thread overview]
Message-ID: <20090311165834.GA16489@amt.cnet> (raw)
In-Reply-To: <200903111648.02530.paul@codesourcery.com>
On Wed, Mar 11, 2009 at 04:48:01PM +0000, Paul Brook wrote:
> > +QemuSem qemu_sem;
>
> It's entirely unclear what is actually protected by the semaphore.
Everything at the moment.
> What exactly does the IO thread do? AFAICS device MMIO is still run from
> within the CPU thread. Device code is not threadsafe (and probably never will
> be), so you can't run any of the device callbacks in the IO thread either.
> Doesn't seem like there's a lot left for it to do...
There are things which can run in parallel. VNC dirty update, read()'ing
of data into QEMU, for two examples.
next prev parent reply other threads:[~2009-03-11 17:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-11 16:16 [Qemu-devel] [patch 0/2] RFC: separate thread for IO Marcelo Tosatti
2009-03-11 16:16 ` [Qemu-devel] [patch 1/2] qemu: sem/thread helpers Marcelo Tosatti
2009-03-11 16:33 ` [Qemu-devel] " Anthony Liguori
2009-03-11 16:48 ` [Qemu-devel] " Paul Brook
2009-03-11 16:56 ` Anthony Liguori
2009-03-11 16:58 ` Marcelo Tosatti [this message]
2009-03-18 18:47 ` Marcelo Tosatti
2009-03-15 14:15 ` Avi Kivity
2009-03-17 17:42 ` Marcelo Tosatti
2009-03-17 23:07 ` Paul Brook
2009-03-17 23:43 ` Marcelo Tosatti
2009-03-11 16:16 ` [Qemu-devel] [patch 2/2] qemu: separate thread for io Marcelo Tosatti
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