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Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Verita
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support |
Date: |
Wed, 9 Nov 2016 13:47:22 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0 |
On 08/11/2016 16:39, Stefan Hajnoczi wrote:
> The current status is:
>
> 1. virtio-blk and virtio-scsi support multiple queues but these queues
> are processed from a single thread today.
>
> 2. MemoryRegions can be marked with !global_locking so its handler
> functions are dispatched without taking the QEMU global mutex. This
> allows device emulation to run in multiple threads.
Alternatively, virtio-blk and virtio-scsi can already use ioeventfd and
"-object iothread,id=FOO -device virtio-blk-pci,iothread=FOO" to let
device emulation run in a separate thread that doesn't take the QEMU
global mutex.
> 3. Paolo Bonzini (CCed) is currently working on make the block layer
> (BlockDriverState and co) support access from multiple threads and
> multiqueue. This is work in progress.
>
> If you are interested in this work keep an eye out for patch series from
> Paolo Bonzini and Fam Zheng.
The first part (drop RFifoLock) was committed for 2.8. It's a
relatively long road, but these are the currently ready parts of the work:
- take AioContext acquire/release in small critical sections
- push AioContext down to individual callbacks
- make BlockDriverState thread-safe
The latter needs rebasing after the last changes to dirty bitmaps, but I
think these patches should be ready for 2.9.
These are the planned bits:
- replace AioContext with fine-grained mutex in bdrv_aio_*
- protect everything with CoMutex in bdrv_co_*
- remove aio_context_acquire/release
For now I was not planning to make network backends support multiqueue,
only files.
Paolo
Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Stefan Hajnoczi, 2016/11/14
Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, ashish mittal, 2016/11/15
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Stefan Hajnoczi, 2016/11/16
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Jeff Cody, 2016/11/18
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Daniel P. Berrange, 2016/11/18
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Stefan Hajnoczi, 2016/11/18
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Ketan Nilangekar, 2016/11/18
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Daniel P. Berrange, 2016/11/18
- Re: [Qemu-devel] [PATCH v7 RFC] block/vxhs: Initial commit to add Veritas HyperScale VxHS block device support, Ketan Nilangekar, 2016/11/18