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Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker typ
From: |
Fam Zheng |
Subject: |
Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO" |
Date: |
Thu, 28 May 2015 20:05:48 +0800 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
On Thu, 05/28 13:19, Paolo Bonzini wrote:
>
>
> On 28/05/2015 13:11, Fam Zheng wrote:
> > > Whoever uses ioeventfd needs to implement pause/resume, yes---not just
> > > dataplane, also "regular" virtio-blk/virtio-scsi.
> > >
> > > However, everyone else should be okay, because the bottom half runs
> > > immediately and the big QEMU lock is not released in the meanwhile. So
> > > the CPUs have no occasion to run. This needs a comment!
> >
> > I'm not sure. It seems timer callbacks also do I/O, for example
> > nvme_process_sq().
>
> Right, that's also true for USB devices. :(
>
> Perhaps we can skip block_job_defer_to_main_loop if not necessary
> (bs->aio_context == qemu_get_aio_context()).
I think so. It will make dataplane even more specialized but that seems the
only way to fix the problem at the moment.
Fam
- Re: [Qemu-block] [PATCH v6 01/13] block: Add op blocker type "device IO", (continued)
- Re: [Qemu-block] [PATCH v6 01/13] block: Add op blocker type "device IO", Kevin Wolf, 2015/05/27
- Re: [Qemu-block] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/27
- Re: [Qemu-block] [PATCH v6 01/13] block: Add op blocker type "device IO", Kevin Wolf, 2015/05/27
- Re: [Qemu-block] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/27
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/27
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO",
Fam Zheng <=
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Andrey Korolyov, 2015/05/29
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/30
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Kevin Wolf, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Kevin Wolf, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Paolo Bonzini, 2015/05/28
- Re: [Qemu-block] [Qemu-devel] [PATCH v6 01/13] block: Add op blocker type "device IO", Fam Zheng, 2015/05/28