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Re: [Qemu-devel] [PATCH 00/17] aio_context_acquire/release pushdown, par

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH 00/17] aio_context_acquire/release pushdown, part 2
Date: Tue, 24 Jan 2017 09:38:40 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Fri, Jan 20, 2017 at 05:43:05PM +0100, Paolo Bonzini wrote:
> This series pushes down aio_context_acquire/release to the point
> where we can actually reason on using different fine-grained mutexes.
> The main infrastructure is introduced in patch 1.  The new API aio_co_wake
> starts a coroutine with aio_context_acquire/release protection, which
> requires tracking each coroutine's "home" AioContext.  aio_co_schedule
> instead takes care of moving a sleeping coroutine to a different
> AioContext, also ensuring that it runs under aio_context_acquire/release.
> This is useful to implement bdrv_set_aio_context, as a simpler alternative
> to bottom halves.  Even though one-shot BHs are already simpler than
> what we had before, after this patch aio_co_wake and aio_co_schedule
> save you from having to do aio_context_acquire/release explicitly.
> After patch 2 to 4, which are just small preparatory changes, patches
> 5 to 8 provide an example of how to use the new API.  In particular patch
> 5 to 7 implement a new organization of coroutines in the NBD client,
> which allows not blocking on partial reply header reads.

FYI, I added my S-o-B to the two io: patches, so when this series is ready
just include them in your main pull request - no need for me to take those
io: patches separately.

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