On Wed, Feb 01, 2012 at 08:57:19AM -0500, Christoph Hellwig wrote:
> 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.
These conflict with Chandra's project quota patches. I've started
looking at them again, but I am a little uncomfortable with the change
to the superblock... could I get your opinion of that while I take a
look at these?