From: Ming Lei <ming.lei@redhat.com>
To: Brian Foster <bfoster@redhat.com>
Cc: linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3 1/3] iomap: resched ioend completion when in non-atomic context
Date: Sat, 22 May 2021 15:45:11 +0800 [thread overview]
Message-ID: <YKi2hwnJMbLYtkmb@T590> (raw)
In-Reply-To: <20210517171722.1266878-2-bfoster@redhat.com>
On Mon, May 17, 2021 at 01:17:20PM -0400, Brian Foster wrote:
> The iomap ioend mechanism has the ability to construct very large,
> contiguous bios and/or bio chains. This has been reported to lead to
BTW, it is actually wrong to complete a large bio chains in
iomap_finish_ioend(), which may risk in bio allocation deadlock, cause
bio_alloc_bioset() relies on bio submission to make forward progress. But
it becomes not true when all chained bios are freed just after the whole
ioend is done since all chained bios(except for the one embedded in ioend)
are allocated from same bioset(fs_bio_set).
Thanks,
Ming
next prev parent reply other threads:[~2021-05-22 7:45 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-17 17:17 [PATCH v3 0/3] iomap: avoid soft lockup warnings on large ioends Brian Foster
2021-05-17 17:17 ` [PATCH v3 1/3] iomap: resched ioend completion when in non-atomic context Brian Foster
2021-05-17 17:54 ` Matthew Wilcox
2021-05-18 11:38 ` Brian Foster
2021-05-20 21:58 ` Darrick J. Wong
2021-05-24 11:57 ` Brian Foster
2021-05-24 16:53 ` Darrick J. Wong
2021-05-26 1:19 ` Darrick J. Wong
2021-05-22 7:45 ` Ming Lei [this message]
2021-05-24 11:57 ` Brian Foster
2021-05-24 14:11 ` Ming Lei
2021-05-17 17:17 ` [PATCH v3 2/3] xfs: kick large ioends to completion workqueue Brian Foster
2021-05-26 1:20 ` Darrick J. Wong
2021-05-17 17:17 ` [PATCH RFC v3 3/3] iomap: bound ioend size to 4096 pages Brian Foster
2021-05-19 13:28 ` Christoph Hellwig
2021-05-19 14:52 ` Brian Foster
2021-05-20 23:27 ` Darrick J. Wong
2021-05-24 12:02 ` Brian Foster
2021-05-25 4:20 ` Darrick J. Wong
2021-05-25 4:29 ` Damien Le Moal
2021-05-25 7:13 ` Dave Chinner
2021-05-25 9:07 ` Andreas Gruenbacher
2021-05-26 2:12 ` Matthew Wilcox
2021-05-26 3:32 ` Darrick J. Wong
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