From: no-reply@sashiko.virtuozzo.com
To: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>,
Konstantin Khorenko <khorenko@virtuozzo.com>
Cc: devel@openvz.org
Subject: Re: [Devel] [PATCH hci-8.1 v3 2/3] block/blk-throttle: account a throttled write in CBT
Date: Tue, 27 Oct 2026 10:22:25 +0000 [thread overview]
Message-ID: <010701a17ce1f638-0c3a03ca-c80c-4541-bd0a-7dbfaf809672-000000@eu-central-1.amazonses.com> (raw)
In-Reply-To: <20261027-ptikhomirov-vstor-149268-cbt-account-at-rq-start-v3-2-e1bc61a829a0@virtuozzo.com>
> submit_bio_noacct() accounts a write in CBT only when blk-throttle does
> not hold it: a throttled bio is later issued from the throttle dispatch
> work with submit_bio_noacct_nocheck(), which skips CBT. So writes delayed
> by an IO limit never reach CBT, and incremental backups miss them.
>
> Account the bio in CBT when the dispatch work issues it. The work runs
> in process context with no locks held, so CBT may allocate there as it
> does at submission.
>
> https://virtuozzo.atlassian.net/browse/VSTOR-149268
> Feature: cbt: changed block tracking (for backup)
> Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261027-ptikhomirov-vstor-149268-cbt-account-at-rq-start-v3-0-e1bc61a829a0@virtuozzo.com?part=2
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next prev parent reply other threads:[~2026-10-27 10:23 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-27 10:18 [Devel] [PATCH hci-8.1 v3 0/3] block/blk-cbt: don't lose writes held across a dm suspend Pavel Tikhomirov
2026-10-27 10:18 ` [Devel] [PATCH hci-8.1 v3 1/3] block/blk-cbt: shift the block size as unsigned Pavel Tikhomirov
2026-10-27 10:22 ` no-reply
2026-10-27 10:18 ` [Devel] [PATCH hci-8.1 v3 2/3] block/blk-throttle: account a throttled write in CBT Pavel Tikhomirov
2026-10-27 10:22 ` no-reply [this message]
2026-10-27 10:18 ` [Devel] [PATCH hci-8.1 v3 3/3] block/blk-cbt: account a write request also when dm starts it Pavel Tikhomirov
2026-10-27 10:26 ` no-reply
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