From: no-reply@sashiko.virtuozzo.com
To: den@openvz.org, Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH hci-8.1 v3 1/5] dm-ploop: fix lost wakeup in ploop_allocator()
Date: Thu, 8 Oct 2026 14:07:48 +0000 [thread overview]
Message-ID: <010701a11bd778ee-313090a3-7b46-4b3e-9086-7c711507a5a1-000000@eu-central-1.amazonses.com> (raw)
In-Reply-To: <20261008140333.614909-2-alexander.ivanov@virtuozzo.com>
> ploop_allocator() checks prealloc_size and kthread_should_stop() before
> setting TASK_INTERRUPTIBLE. If ploop_req_prealloc() sets prealloc_size
> and calls wake_up_process() in between, the wakeup finds the task
> running and is lost, so the allocator goes to sleep with a pending
> preallocation request. Later requests for the same size return early
> without waking it up, so the request may stay pending forever and
> waiters on dispatcher_wq_prealloc hang. The same applies to
> kthread_stop().
>
> Set the task state before checking the conditions, as the canonical
> kthread loop does. set_current_state() implies a full barrier, which
> pairs with the one in try_to_wake_up().
>
> https://virtuozzo.atlassian.net/browse/VSTOR-148171
> Feature: dm-ploop: ploop target driver
>
> Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261008140333.614909-1-alexander.ivanov@virtuozzo.com?part=1
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next prev parent reply other threads:[~2026-10-08 14:09 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-08 14:03 [Devel] [PATCH hci-8.1 v3 0/5] dm-ploop: truncate unused tail of top delta on suspend Alexander Ivanov
2026-10-08 14:03 ` [Devel] [PATCH hci-8.1 v3 1/5] dm-ploop: fix lost wakeup in ploop_allocator() Alexander Ivanov
2026-10-08 14:07 ` no-reply [this message]
2026-10-08 16:51 ` Denis V. Lunev
2026-10-08 14:03 ` [Devel] [PATCH hci-8.1 v3 2/5] dm-ploop: set delta is_raw before applying its mappings Alexander Ivanov
2026-10-08 14:09 ` no-reply
2026-10-08 16:51 ` Denis V. Lunev
2026-10-09 6:28 ` Alexander Ivanov
2026-10-08 14:03 ` [Devel] [PATCH hci-8.1 v3 3/5] dm-ploop: factor out ploop_read_delta() from ploop_add_delta() Alexander Ivanov
2026-10-08 14:08 ` no-reply
2026-10-08 16:51 ` Denis V. Lunev
2026-10-08 14:03 ` [Devel] [PATCH hci-8.1 v3 4/5] dm-ploop: reload metadata on resume Alexander Ivanov
2026-10-08 14:18 ` no-reply
2026-10-08 16:51 ` Denis V. Lunev
2026-10-08 14:03 ` [Devel] [PATCH hci-8.1 v3 5/5] dm-ploop: truncate unused tail of top delta on suspend Alexander Ivanov
2026-10-08 14:15 ` no-reply
2026-10-08 16:51 ` Denis V. Lunev
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