From: Christoph Hellwig <hch@lst.de>
To: Brian Foster <bfoster@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, linux-xfs@vger.kernel.org
Subject: Re: [PATCH 05/20] xfs: remove the iop_push implementation for quota off items
Date: Mon, 20 May 2019 08:09:10 +0200 [thread overview]
Message-ID: <20190520060910.GF31977@lst.de> (raw)
In-Reply-To: <20190517140841.GE7888@bfoster>
On Fri, May 17, 2019 at 10:08:42AM -0400, Brian Foster wrote:
> Hmm, this one is a bit interesting because it's a potential change in
> behavior and I'm not sure the comment above accurately reflects the
> situation. In xfs_qm_scall_quotaoff(), we log the first quotaoff item
> and commit it synchronously. I believe this means it immediately goes
> into the AIL. Then we have to iterate inodes to drop all dquot
> references and purge the dquot cache, which can do I/O by writing back
> dquot bufs before we eventually log the quotaoff_end item. All in all
> this can take a bit of time (and we have test scenarios that reproduce
> quotaoff log deadlocks already).
>
> I think this change can cause AIL processing concurrent to a quotaoff in
> progress to potentially force the log on every pass. I would not expect
> that to have a positive effect because a log force doesn't actually help
> the quotaoff progress until the quotaoff_end is committed, and that
> already occurs synchronously as well. I don't think it's wise to change
> behavior here, at least not without some testing and analysis around how
> this impacts those already somewhat flakey quota off operations.
True, the log force probably doesn't help. I'll drop this for now,
the whole quotaoff logging scheme looks pretty dodgy to me to start
with, so it will need some more attention in the future.
next prev parent reply other threads:[~2019-05-20 6:09 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-17 7:30 misc log item related cleanups Christoph Hellwig
2019-05-17 7:31 ` [PATCH 01/20] xfs: fix a trivial comment typo in the xfs_trans_committed_bulk Christoph Hellwig
2019-05-17 14:04 ` Brian Foster
2019-05-20 22:08 ` Darrick J. Wong
2019-05-17 7:31 ` [PATCH 02/20] xfs: stop using XFS_LI_ABORTED as a parameter flag Christoph Hellwig
2019-05-17 14:04 ` Brian Foster
2019-05-20 6:03 ` Christoph Hellwig
2019-05-17 14:10 ` Eric Sandeen
2019-05-20 6:05 ` Christoph Hellwig
2019-05-20 22:08 ` Darrick J. Wong
2019-06-11 8:46 ` Christoph Hellwig
2019-05-17 7:31 ` [PATCH 03/20] xfs: don't require log items to implement optional methods Christoph Hellwig
2019-05-17 14:06 ` Brian Foster
2019-05-20 6:06 ` Christoph Hellwig
2019-05-17 7:31 ` [PATCH 04/20] xfs: remove the dummy iop_push implementation for inode creation items Christoph Hellwig
2019-05-17 14:07 ` Brian Foster
2019-05-17 7:31 ` [PATCH 05/20] xfs: remove the iop_push implementation for quota off items Christoph Hellwig
2019-05-17 14:08 ` Brian Foster
2019-05-20 6:09 ` Christoph Hellwig [this message]
2019-05-17 7:31 ` [PATCH 06/20] xfs: don't use xfs_trans_free_items in the commit path Christoph Hellwig
2019-05-17 14:08 ` Brian Foster
2019-05-17 7:31 ` [PATCH 07/20] xfs: split iop_unlock Christoph Hellwig
2019-05-17 17:49 ` Brian Foster
2019-05-20 6:10 ` Christoph Hellwig
2019-05-20 11:38 ` Brian Foster
2019-05-17 7:31 ` [PATCH 08/20] xfs: add a flag to release log items on commit Christoph Hellwig
2019-05-17 17:50 ` Brian Foster
2019-05-20 6:11 ` Christoph Hellwig
2019-05-17 7:31 ` [PATCH 09/20] xfs: don't cast inode_log_items to get the log_item Christoph Hellwig
2019-05-17 17:50 ` Brian Foster
2019-05-17 7:31 ` [PATCH 10/20] xfs: remove the xfs_log_item_t typedef Christoph Hellwig
2019-05-17 17:50 ` Brian Foster
2019-05-17 7:31 ` [PATCH 11/20] xfs: use a list_head for iclog callbacks Christoph Hellwig
2019-05-20 13:12 ` Brian Foster
2019-05-20 13:19 ` Christoph Hellwig
2019-05-20 13:25 ` Brian Foster
2019-05-20 13:27 ` Bryan Gurney
2019-05-20 13:31 ` Christoph Hellwig
2019-05-17 7:31 ` [PATCH 12/20] xfs: remove a pointless comment duplicated above all xfs_item_ops instances Christoph Hellwig
2019-05-20 13:12 ` Brian Foster
2019-05-17 7:31 ` [PATCH 13/20] xfs: merge xfs_efd_init into xfs_trans_get_efd Christoph Hellwig
2019-05-17 8:16 ` Nikolay Borisov
2019-05-17 8:27 ` Christoph Hellwig
2019-05-17 18:26 ` Eric Sandeen
2019-05-20 6:03 ` Christoph Hellwig
2019-05-20 13:12 ` Brian Foster
2019-05-17 7:31 ` [PATCH 14/20] xfs: merge xfs_cud_init into xfs_trans_get_cud Christoph Hellwig
2019-05-20 13:13 ` Brian Foster
2019-05-17 7:31 ` [PATCH 15/20] xfs: merge xfs_rud_init into xfs_trans_get_rud Christoph Hellwig
2019-05-20 13:13 ` Brian Foster
2019-05-17 7:31 ` [PATCH 16/20] xfs: merge xfs_bud_init into xfs_trans_get_bud Christoph Hellwig
2019-05-20 13:13 ` Brian Foster
2019-05-17 7:31 ` [PATCH 17/20] xfs: merge xfs_trans_extfree.c into xfs_extfree_item.c Christoph Hellwig
2019-05-20 13:13 ` Brian Foster
2019-05-17 7:31 ` [PATCH 18/20] xfs: merge xfs_trans_refcount.c into xfs_refcount_item.c Christoph Hellwig
2019-05-20 13:14 ` Brian Foster
2019-05-17 7:31 ` [PATCH 19/20] xfs: merge xfs_trans_rmap.c into xfs_rmap_item.c Christoph Hellwig
2019-05-20 13:14 ` Brian Foster
2019-05-17 7:31 ` [PATCH 20/20] xfs: merge xfs_trans_bmap.c into xfs_bmap_item.c Christoph Hellwig
2019-05-20 13:14 ` Brian Foster
2019-06-13 18:02 misc log item related cleanups v2 Christoph Hellwig
2019-06-13 18:02 ` [PATCH 05/20] xfs: remove the iop_push implementation for quota off items Christoph Hellwig
2019-06-14 14:43 ` Brian Foster
2019-06-14 14:44 ` Christoph Hellwig
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