From: "Philippe Mathieu-Daudé" <philmd@linaro.org>
To: Stefan Hajnoczi <stefanha@redhat.com>, qemu-devel@nongnu.org
Cc: Fam Zheng <fam@euphon.net>,
qemu-block@nongnu.org,
Emanuele Giuseppe Esposito <eesposit@redhat.com>,
Markus Armbruster <armbru@redhat.com>,
Kevin Wolf <kwolf@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Hanna Reitz <hreitz@redhat.com>
Subject: Re: [PATCH 3/6] block: convert bdrv_graph_wrlock() to AIO_WAIT_WHILE_UNLOCKED()
Date: Tue, 7 Mar 2023 21:37:30 +0100 [thread overview]
Message-ID: <42d16cdc-6a66-8aab-564e-1fbf3e79462b@linaro.org> (raw)
In-Reply-To: <5b5cc9c3-7768-f4a7-c188-90de98053db7@linaro.org>
On 2/3/23 11:19, Philippe Mathieu-Daudé wrote:
> On 1/3/23 21:57, Stefan Hajnoczi wrote:
>> The following conversion is safe and does not change behavior:
>>
>> GLOBAL_STATE_CODE();
>> ...
>> - AIO_WAIT_WHILE(qemu_get_aio_context(), ...);
>> + AIO_WAIT_WHILE_UNLOCKED(NULL, ...);
>>
>> Since we're in GLOBAL_STATE_CODE(), qemu_get_aio_context() is our home
>> thread's AioContext. Thus AIO_WAIT_WHILE() does not unlock the
>> AioContext:
>>
>> if (ctx_ && in_aio_context_home_thread(ctx_)) { \
>> while ((cond)) { \
>> aio_poll(ctx_, true); \
>> waited_ = true; \
>> } \
>>
>> And that means AIO_WAIT_WHILE_UNLOCKED(NULL, ...) can be substituted.
>>
>> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
>> ---
>> block/graph-lock.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Tested-by: Philippe Mathieu-Daudé <philmd@linaro.org>
next prev parent reply other threads:[~2023-03-07 20:38 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-01 20:57 [PATCH 0/6] block: switch to AIO_WAIT_WHILE_UNLOCKED() where possible Stefan Hajnoczi
2023-03-01 20:57 ` [PATCH 1/6] block: don't acquire AioContext lock in bdrv_drain_all() Stefan Hajnoczi
2023-03-07 17:17 ` Kevin Wolf
2023-03-07 19:20 ` Stefan Hajnoczi
2023-03-08 8:48 ` Kevin Wolf
2023-03-08 14:26 ` Stefan Hajnoczi
2023-03-08 17:25 ` Kevin Wolf
2023-03-09 12:38 ` Stefan Hajnoczi
2023-03-01 20:57 ` [PATCH 2/6] block: convert blk_exp_close_all_type() to AIO_WAIT_WHILE_UNLOCKED() Stefan Hajnoczi
2023-03-02 10:36 ` Philippe Mathieu-Daudé
2023-03-02 13:08 ` Stefan Hajnoczi
2023-03-02 14:16 ` Philippe Mathieu-Daudé
2023-03-02 16:00 ` Stefan Hajnoczi
2023-03-07 20:37 ` Philippe Mathieu-Daudé
2023-03-01 20:57 ` [PATCH 3/6] block: convert bdrv_graph_wrlock() " Stefan Hajnoczi
2023-03-02 10:19 ` Philippe Mathieu-Daudé
2023-03-07 20:37 ` Philippe Mathieu-Daudé [this message]
2023-03-01 20:57 ` [PATCH 4/6] block: convert bdrv_drain_all_begin() " Stefan Hajnoczi
2023-03-07 20:37 ` Philippe Mathieu-Daudé
2023-03-01 20:58 ` [PATCH 5/6] hmp: convert handle_hmp_command() " Stefan Hajnoczi
2023-03-02 7:17 ` Markus Armbruster
2023-03-02 13:22 ` Stefan Hajnoczi
2023-03-02 15:02 ` Markus Armbruster
2023-03-02 15:48 ` Stefan Hajnoczi
2023-03-02 16:25 ` Markus Armbruster
2023-03-07 20:39 ` Philippe Mathieu-Daudé
2023-03-01 20:58 ` [PATCH 6/6] monitor: convert monitor_cleanup() " Stefan Hajnoczi
2023-03-02 7:20 ` Markus Armbruster
2023-03-02 16:26 ` Markus Armbruster
2023-03-07 20:39 ` Philippe Mathieu-Daudé
2023-03-07 17:29 ` [PATCH 0/6] block: switch to AIO_WAIT_WHILE_UNLOCKED() where possible Kevin Wolf
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