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Re: [Qemu-block] [PATCH for 2.10 00/17] Block layer thread safety, part

From: Stefan Hajnoczi
Subject: Re: [Qemu-block] [PATCH for 2.10 00/17] Block layer thread safety, part 1
Date: Fri, 5 May 2017 14:01:57 +0100
User-agent: Mutt/1.8.0 (2017-02-23)

On Thu, Apr 20, 2017 at 02:00:41PM +0200, Paolo Bonzini wrote:
> This series uses mutexes or atomic operations around core block layer
> operations.  The remaining parts include:
> - drivers, though most of them are already thread safe (part 2, 8 patches,
>   depends on Kevin's conversion of QED to coroutines)
> - block jobs, before-write notifiers, the write threshold mechanism,
>   snapshots, replication, key management (part 3, 16 patches)
> - devices (virtio-blk/virtio-scsi, part 4, 5 patches)
> Once these four parts are done the AioContext lock can be removed
> together with all temporary workarounds that have accumulated.

I like the direction these changes are heading in.

Avoiding low-level tricks and custom primitives would be nice until
there is performance data justifying them because they are
time-consuming to review, increase complexity, and are likely to be
misused by others.


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