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xfs: replace i_pin_wait with a bit waitqueue

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Replace i_pin_wait, which is only used during synchronous inode flushing
with a bit waitqueue.  This trades off a much smaller inode against
slightly slower wakeup performance, and saves 12 (32-bit) or 20 (64-bit)
bytes in the XFS inode.

Reviewed-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Christoph Hellwig 2011-12-18 20:00:10 +00:00 • committed by Ben Myers
parent 474fce0675
commit f392e6319a
4 changed files with 24 additions and 9 deletions
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2
fs/xfs/xfs_inode_item.c
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@ -555,7 +555,7 @@ xfs_inode_item_unpin(
trace_xfs_inode_unpin(ip, _RET_IP_);
ASSERT(atomic_read(&ip->i_pincount) > 0);
if (atomic_dec_and_test(&ip->i_pincount))
wake_up(&ip->i_ipin_wait);
wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
}
/*