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From: Dave Chinner <david@fromorbit.com>
To: xfs@oss.sgi.com
Subject: ***** SUSPECTED SPAM ***** [RFD 09/17] xfs: optimise inode chunk freeing
Date: Mon, 12 Aug 2013 23:19:59 +1000	[thread overview]
Message-ID: <1376313607-28133-10-git-send-email-david@fromorbit.com> (raw)
In-Reply-To: <1376313607-28133-1-git-send-email-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

Now that the inode chunk freeing is done asynchronously, we can make
more intelligent decisions about freeing inode chunks. As we have a
inode btree that tracks free inodes, we can quickly find out whether
the adjacent inode chunks are free. We can then match inode chunk
freeing patterns to the allocation patterns that are in use.

We can also track the rate at which we are freeing inode chunks and
compare that to the rate at which we are allocating inode chunks. If
we are both allocating and freeing inode chunks, then we should slow
down the rate at which we are freeing inode chunks so that
allocation can occur directly from the empty inode chunks rather
than forcing them to be reallocated shortly after then have been
freed.

Further, for sequential chunks we should be able to implement bulk
removal of the records from the inode btrees as long as we can
guarantee that it only results in a single merge operation. The
constraints and processes would be similar to the bulk insert
operation proposed for inode allocation.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_ag.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/xfs/xfs_ag.h b/fs/xfs/xfs_ag.h
index b34f641..c423191 100644
--- a/fs/xfs/xfs_ag.h
+++ b/fs/xfs/xfs_ag.h
@@ -254,6 +254,7 @@ typedef struct xfs_perag {
 
 	int		pagi_chunk_alloc_rate;
 	int		pagi_chunk_free_rate;
+	xfs_agino_t	pagi_free_chunk;
 
 	/*
 	 * Inode allocation search lookup optimisation.
-- 
1.8.3.2

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  parent reply	other threads:[~2013-08-12 13:20 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-08-12 13:19 ***** SUSPECTED SPAM ***** [RFD 00/17] xfs: inode management development direction Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 01/17] xfs: inode allocation tickets Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 02/17] xfs: separate inode chunk allocation from free inode allocation Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 03/17] xfs: move inode chunk allocation into a workqueue Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 04/17] xfs: optimise background inode chunk allocation Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 05/17] xfs: introduce a free inode allocation btree Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 06/17] xfs: partial inode chunk allocation Dave Chinner
2013-08-13 22:07   ` Brian Foster
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 07/17] xfs: separate inode chunk freeing from inode freeing Dave Chinner
2013-08-12 13:19 ` ***** SUSPECTED SPAM ***** [RFD 08/17] xfs: inode chunk freeing in the background Dave Chinner
2013-08-12 13:19 ` Dave Chinner [this message]
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 10/17] xfs: swap extents operations for CRC filesystems Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 11/17] xfs: factor xfs_create to prepare for O_TMPFILE Dave Chinner
2013-08-20  8:16   ` Zhi Yong Wu
2013-11-06 11:20     ` Christoph Hellwig
2013-11-06 11:21   ` Christoph Hellwig
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 12/17] xfs: add tmpfile methods Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 13/17] xfs: allow linkat() on O_TMPFILE files Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 14/17] xfs: separate inode freeing from inactivation Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 15/17] xfs: introduce a method vector for unlinked list operations Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 16/17] xfs: add in-core unlinked list for v3 inodes Dave Chinner
2013-08-12 13:20 ` ***** SUSPECTED SPAM ***** [RFD 17/17] xfs: log unlinked list modifications in the incore v3 inode Dave Chinner

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