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[PATCH 0/7] better dquot caching

To: xfs@xxxxxxxxxxx
Subject: [PATCH 0/7] better dquot caching
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 01 Feb 2012 08:57:19 -0500
Cc: arekm@xxxxxxxx
User-agent: quilt/0.48-1
This series improves handling of large number of dquots.  It replaced
the direct recycling of dquots from the freelist with a shrinker, removes
the upper bound of dquots, and uses per-filesystem structures for all
quota state, including switching from a hash to a radix-tree for lookups.

For repeated lookups of dquots out of a large pool I see improvements
betwen 50% and 500% compared to the previous code.  All these tests
have been performed with Q_XQUOTASYNC already disabled as it would
change the result to much for both the old and new code.

Note that the first patch probably is a candidate for Linux 3.3, as
the previous quota updates caused a lock order reversal in the old
quota reclaim code.  See the actual patch for more details.

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