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Re: [PATCH 6/6] monitor: convert monitor_cleanup() to AIO_WAIT_WHILE_UNL
From: |
Markus Armbruster |
Subject: |
Re: [PATCH 6/6] monitor: convert monitor_cleanup() to AIO_WAIT_WHILE_UNLOCKED() |
Date: |
Thu, 02 Mar 2023 08:20:03 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Stefan Hajnoczi <stefanha@redhat.com> writes:
> monitor_cleanup() is called from the main loop thread. Calling
Correct.
> AIO_WAIT_WHILE(qemu_get_aio_context(), ...) from the main loop thread is
> equivalent to AIO_WAIT_WHILE_UNLOCKED(NULL, ...) because neither unlocks
> the AioContext and the latter's assertion that we're in the main loop
> succeeds.
>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
> monitor/monitor.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/monitor/monitor.c b/monitor/monitor.c
> index 8dc96f6af9..602535696c 100644
> --- a/monitor/monitor.c
> +++ b/monitor/monitor.c
> @@ -666,7 +666,7 @@ void monitor_cleanup(void)
> * We need to poll both qemu_aio_context and iohandler_ctx to make
> * sure that the dispatcher coroutine keeps making progress and
> * eventually terminates. qemu_aio_context is automatically
> - * polled by calling AIO_WAIT_WHILE on it, but we must poll
> + * polled by calling AIO_WAIT_WHILE_UNLOCKED on it, but we must poll
> * iohandler_ctx manually.
> *
> * Letting the iothread continue while shutting down the dispatcher
> @@ -679,7 +679,7 @@ void monitor_cleanup(void)
> aio_co_wake(qmp_dispatcher_co);
> }
>
> - AIO_WAIT_WHILE(qemu_get_aio_context(),
> + AIO_WAIT_WHILE_UNLOCKED(NULL,
> (aio_poll(iohandler_get_aio_context(), false),
> qatomic_mb_read(&qmp_dispatcher_co_busy)));
Acked-by: Markus Armbruster <armbru@redhat.com>
For an R-by, I need to understand this in more detail. See my reply to
the previous patch.
- [PATCH 4/6] block: convert bdrv_drain_all_begin() to AIO_WAIT_WHILE_UNLOCKED(), (continued)
Re: [PATCH 5/6] hmp: convert handle_hmp_command() to AIO_WAIT_WHILE_UNLOCKED(), Philippe Mathieu-Daudé, 2023/03/07
[PATCH 6/6] monitor: convert monitor_cleanup() to AIO_WAIT_WHILE_UNLOCKED(), Stefan Hajnoczi, 2023/03/01
Re: [PATCH 0/6] block: switch to AIO_WAIT_WHILE_UNLOCKED() where possible, Kevin Wolf, 2023/03/07