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    SubjectRe: [PATCH 0/5] Per superblock shrinkers V2
    On Tue, May 25, 2010 at 06:53:03PM +1000, Dave Chinner wrote:
    > This series reworks the filesystem shrinkers. We currently have a
    > set of issues with the current filesystem shrinkers:
    > 1. There is an dependency between dentry and inode cache
    > shrinking that is only implicitly defined by the order of
    > shrinker registration.
    > 2. The shrinkers need to walk the superblock list and pin
    > the superblock to avoid unmount races with the sb going
    > away.
    > 3. The dentry cache uses per-superblock LRUs and proportions
    > reclaim between all the superblocks which means we are
    > doing breadth based reclaim. This means we touch every
    > superblock for every shrinker call, and may only reclaim
    > a single dentry at a time from a given superblock.
    > 4. The inode cache has a global LRU, so it has different
    > reclaim patterns to the dentry cache, despite the fact
    > that the dentry cache is generally the only thing that
    > pins inodes in memory.
    > 5. Filesystems need to register their own shrinkers for
    > caches and can't co-ordinate them with the dentry and
    > inode cache shrinkers.

    Seems like a fairly good approach overall. Thanks.

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      Last update: 2010-05-26 18:47    [W:0.020 / U:1.416 seconds]
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