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Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine
From: |
Kevin Wolf |
Subject: |
Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine |
Date: |
Wed, 19 Feb 2020 16:27:44 +0100 |
User-agent: |
Mutt/1.12.1 (2019-06-15) |
Am 19.02.2020 um 15:21 hat Markus Armbruster geschrieben:
> I think we need to talk about AioContext in qapi-code-gen.txt. PATCH 1
> now adds
>
> Member 'coroutine' tells the QMP dispatcher whether the command handler
> is safe to be run in a coroutine. It defaults to false. If it is true,
> the command handler is called from coroutine context and may yield while
> waiting for an external event (such as I/O completion) in order to avoid
> blocking the guest and other background operations.
>
> What about "is called from a coroutine running in the main loop with
> @qemu_aio_context, and may yield"?
>
> Likewise for the commit message of PATCH 3:
>
> This moves the QMP dispatcher to a coroutine and runs all QMP command
> handlers that declare 'coroutine': true in coroutine context so they
> can avoid blocking the main loop while doing I/O or waiting for other
> events.
>
> "calls all ... in a coroutine running in the main loop with
> @qemu_aio_context, so they can".
>
> Speaking of PATCH 1:
>
> It is an error to specify both 'coroutine': true and 'allow-oob': true
> for a command. (We don't currently have a use case for both together and
> without a use case, it's not entirely clear what the semantics should be.)
>
> Let's lose the parenthesis around the last sentence.
>
> If you agree with my proposed tweaks, and nothing else comes up, I can
> try to do them in my tree.
Works for me.
In the v5 thread, dropping patch 2 came up. I think it may not be needed
any more in the current version and 'make check' passes without it.
Kevin
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Markus Armbruster, 2020/02/17
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Kevin Wolf, 2020/02/17
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Markus Armbruster, 2020/02/18
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Kevin Wolf, 2020/02/18
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Markus Armbruster, 2020/02/19
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Kevin Wolf, 2020/02/19
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Markus Armbruster, 2020/02/19
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine, Markus Armbruster, 2020/02/19
- Re: [PATCH v4 3/4] qmp: Move dispatcher to a coroutine,
Kevin Wolf <=