From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: xfs@oss.sgi.com
Subject: Re: block allocations for the refcount btree
Date: Wed, 10 Feb 2016 11:07:38 -0800 [thread overview]
Message-ID: <20160210190738.GA13051@infradead.org> (raw)
In-Reply-To: <20160210095010.GC23904@birch.djwong.org>
On Wed, Feb 10, 2016 at 01:50:10AM -0800, Darrick J. Wong wrote:
> That's odd... I'd have thought that the AG reservation would always be able
> to handle a refcount btree expansion, since it calculates how many blocks
> are needed to handle the worst case of 1 record per extent. There's also
> a bug where we undercount the number of blocks already used, so it should
> have an extra big reservation.
>
> OTOH I've seen occasional ENOSPCs in generic/186 and generic/168 too, so I
> guess something's going wrong. Maybe the xfs_ag_resv* tracepoints can help?
I'm not seeing an ENOSPC, I run into:
[ 640.924891] XFS: Assertion failed: tp->t_blk_res_used <= tp->t_blk_res, file: fs/xfs/xfs_trans.c, line: 315
Which asserts that the current transaction is using up more blocks from
its reservation than it reserved. The AG reservation seems to operate
on a different level than that.
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next prev parent reply other threads:[~2016-02-10 19:07 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-10 9:30 block allocations for the refcount btree Christoph Hellwig
2016-02-10 9:50 ` Darrick J. Wong
2016-02-10 19:07 ` Christoph Hellwig [this message]
2016-02-10 21:40 ` Dave Chinner
2016-02-11 14:09 ` Brian Foster
2016-02-11 20:21 ` Dave Chinner
2016-02-12 19:10 ` Christoph Hellwig
2016-02-13 2:33 ` Dave Chinner
2016-02-13 4:44 ` Darrick J. Wong
2016-02-13 8:02 ` Christoph Hellwig
2016-02-13 7:48 ` Christoph Hellwig
2016-02-14 0:21 ` Dave Chinner
2016-03-01 18:18 ` Darrick J. Wong
2016-03-01 20:40 ` Christoph Hellwig
2016-03-02 5:24 ` Darrick J. Wong
2016-03-02 9:59 ` Christoph Hellwig
2016-03-02 16:41 ` Darrick J. Wong
2016-03-02 16:57 ` Christoph Hellwig
2016-03-02 21:21 ` Darrick J. Wong
2016-03-03 14:05 ` Christoph Hellwig
2016-03-04 1:36 ` Darrick J. Wong
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