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Re: [PATCH v4 16/19] job: detect change of aiocontext within job corouti
From: |
Emanuele Giuseppe Esposito |
Subject: |
Re: [PATCH v4 16/19] job: detect change of aiocontext within job coroutine |
Date: |
Mon, 31 Jan 2022 11:03:52 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 |
> As a small improvement, we don't need aio_co_enter() in job_start(),
> we can simplify it with qemu_coroutine_enter(). If the aio_context
> where it is running is wrong, job_do_yield_locked() will automatically
> reschedule the coroutine where it belongs, once the first
> job_pause_point is triggered in job_co_entry.
>
> @@ -1145,7 +1161,7 @@ void job_start(Job *job)
> job->paused = false;
> job_state_transition_locked(job, JOB_STATUS_RUNNING);
> }
> - aio_co_enter(job->aio_context, job->co);
> + qemu_coroutine_enter(job->co);
This is actually wrong. If the job is not under drain, job_pause_point
in job_co_enter is not going to yield() job->co, so it won't change the
aiocontext automatically, running part if not all of job->driver->run()
in the wrong AioContext.
I will drop it in v5.
Emanuele
- [PATCH v4 01/19] job.c: make job_mutex and job_lock/unlock() public, (continued)
- [PATCH v4 01/19] job.c: make job_mutex and job_lock/unlock() public, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 02/19] job.h: categorize fields in struct Job, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 04/19] job.c: move inner aiocontext lock in callbacks, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 03/19] job.c: make job_event_* functions static, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 05/19] aio-wait.h: introduce AIO_WAIT_WHILE_UNLOCKED, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 07/19] jobs: protect jobs with job_lock/unlock, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 14/19] blockjob: block_job_get_aio_context is a GS function, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 06/19] jobs: remove aiocontext locks since the functions are under BQL, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 09/19] jobs: use job locks also in the unit tests, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 16/19] job: detect change of aiocontext within job coroutine, Emanuele Giuseppe Esposito, 2022/01/28
- Re: [PATCH v4 16/19] job: detect change of aiocontext within job coroutine,
Emanuele Giuseppe Esposito <=
- [PATCH v4 12/19] job.h: define unlocked functions, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 17/19] jobs: protect job.aio_context with BQL and job_mutex, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 18/19] job.c: enable job lock/unlock and remove Aiocontext locks, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 19/19] block_job_query: remove atomic read, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 11/19] jobs: document all static functions and add _locked() suffix, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 08/19] jobs: add job lock in find_* functions, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 13/19] block/mirror.c: use of job helpers in drivers to avoid TOC/TOU, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 15/19] commit and mirror: create new nodes using bdrv_get_aio_context, and not the job aiocontext, Emanuele Giuseppe Esposito, 2022/01/28
- [PATCH v4 10/19] job.h: define locked functions, Emanuele Giuseppe Esposito, 2022/01/28