From: Ben Myers <bpm@sgi.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 0/7] better dquot caching
Date: Tue, 7 Feb 2012 01:30:09 -0600 [thread overview]
Message-ID: <20120207073009.GM13095@sgi.com> (raw)
In-Reply-To: <20120201135719.202171828@bombadil.infradead.org>
Hey Christoph,
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?
Thanks,
Ben
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next prev parent reply other threads:[~2012-02-07 7:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 13:57 [PATCH 0/7] better dquot caching Christoph Hellwig
2012-02-01 13:57 ` [PATCH 1/7] xfs: use a normal shrinker for the dquot freelist Christoph Hellwig
2012-02-09 22:03 ` Ben Myers
2012-02-09 22:56 ` Christoph Hellwig
2012-02-09 23:13 ` Ben Myers
2012-02-10 1:52 ` Dave Chinner
2012-02-10 16:48 ` Ben Myers
2012-02-10 1:49 ` Dave Chinner
2012-02-10 16:56 ` Ben Myers
2012-02-01 13:57 ` [PATCH 2/7] xfs: per-filesystem dquot LRU lists Christoph Hellwig
2012-02-01 13:57 ` [PATCH 3/7] xfs: use per-filesystem radix trees for dquot lookup Christoph Hellwig
2012-02-01 13:57 ` [PATCH 4/7] xfs: remove the per-filesystem list of dquots Christoph Hellwig
2012-02-01 13:57 ` [PATCH 5/7] xfs: use per-cpu data for the quota statistics Christoph Hellwig
2012-02-01 13:57 ` [PATCH 6/7] xfs: user per-cpu stats for the total dquot numbers Christoph Hellwig
2012-02-01 13:57 ` [PATCH 7/7] xfs: remove the globalk xfs_Gqm structure Christoph Hellwig
2012-02-07 7:30 ` Ben Myers [this message]
2012-02-07 13:24 ` [PATCH 0/7] better dquot caching Christoph Hellwig
2012-02-07 15:23 ` Ben Myers
2012-02-11 20:13 ` Arkadiusz Miśkiewicz
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