From: Christoph Hellwig <hch@infradead.org>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 15/16] xfs: only run xfs_error_test if error injection is active
Date: Mon, 8 Nov 2010 06:33:12 -0500 [thread overview]
Message-ID: <20101108113312.GC7654@infradead.org> (raw)
In-Reply-To: <1289206519-18377-16-git-send-email-david@fromorbit.com>
> Walking btree blocks during allocation checking them requires each
> block (a cache hit, so no I/O) call xfs_error_test(), which then
> does a random32() call as teh first operation. IOWs, ~50% of the
> CPU is being consumed just testing whether we need to inject an
> error, even though error injection is not active.
>
> Kill this overhead when error injection is not active by adding a
> global counter of active error traps and only calling into
> xfs_error_test when fault injection is active.
Looks good. And a good reminder that we should optimize the code to not
call xfs_btree_check_block on catch matches once putting the CRC checks
into it later.
Reviewed-by: Christoph Hellwig <hch@lst.de>
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next prev parent reply other threads:[~2010-11-08 11:31 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-08 8:55 [PATCH 00/16] xfs: current patch stack for 2.6.38 window Dave Chinner
2010-11-08 8:55 ` [PATCH 01/16] xfs: fix per-ag reference counting in inode reclaim tree walking Dave Chinner
2010-11-08 9:23 ` Christoph Hellwig
2010-11-08 8:55 ` [PATCH 02/16] xfs: move delayed write buffer trace Dave Chinner
2010-11-08 9:24 ` Christoph Hellwig
2010-11-08 8:55 ` [PATCH 03/16] [RFC] xfs: use generic per-cpu counter infrastructure Dave Chinner
2010-11-08 12:13 ` Christoph Hellwig
2010-11-09 0:20 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 04/16] xfs: dynamic speculative EOF preallocation Dave Chinner
2010-11-08 11:43 ` Christoph Hellwig
2010-11-09 0:08 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 05/16] xfs: don't truncate prealloc from frequently accessed inodes Dave Chinner
2010-11-08 11:36 ` Christoph Hellwig
2010-11-08 23:56 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 06/16] patch xfs-inode-hash-fake Dave Chinner
2010-11-08 9:19 ` Christoph Hellwig
2010-11-08 8:55 ` [PATCH 07/16] xfs: convert inode cache lookups to use RCU locking Dave Chinner
2010-11-08 23:09 ` Christoph Hellwig
2010-11-09 0:24 ` Dave Chinner
2010-11-09 3:36 ` Paul E. McKenney
2010-11-09 5:04 ` Dave Chinner
2010-11-10 5:12 ` Paul E. McKenney
2010-11-10 6:20 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 08/16] xfs: convert pag_ici_lock to a spin lock Dave Chinner
2010-11-08 23:10 ` Christoph Hellwig
2010-11-08 8:55 ` [PATCH 09/16] xfs: convert xfsbud shrinker to a per-buftarg shrinker Dave Chinner
2010-11-08 8:55 ` [PATCH 10/16] xfs: add a lru to the XFS buffer cache Dave Chinner
2010-11-08 23:19 ` Christoph Hellwig
2010-11-08 23:45 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 11/16] xfs: connect up buffer reclaim priority hooks Dave Chinner
2010-11-08 11:25 ` Christoph Hellwig
2010-11-08 23:50 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 12/16] xfs: bulk AIL insertion during transaction commit Dave Chinner
2010-11-08 8:55 ` [PATCH 13/16] xfs: reduce the number of AIL push wakeups Dave Chinner
2010-11-08 11:32 ` Christoph Hellwig
2010-11-08 23:51 ` Dave Chinner
2010-11-08 8:55 ` [PATCH 14/16] xfs: remove all the inodes on a buffer from the AIL in bulk Dave Chinner
2010-11-08 8:55 ` [PATCH 15/16] xfs: only run xfs_error_test if error injection is active Dave Chinner
2010-11-08 11:33 ` Christoph Hellwig [this message]
2010-11-08 8:55 ` [PATCH 16/16] xfs: make xlog_space_left() independent of the grant lock Dave Chinner
2010-11-08 14:17 ` [PATCH 00/16] xfs: current patch stack for 2.6.38 window Christoph Hellwig
2010-11-09 0:21 ` Dave Chinner
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