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    SubjectRe: [PATCH 06/12] inode: Make unused inode LRU per superblock
    On Thu, Jun 02, 2011 at 05:01:01PM +1000, Dave Chinner wrote:
    > From: Dave Chinner <>
    > The inode unused list is currently a global LRU. This does not match
    > the other global filesystem cache - the dentry cache - which uses
    > per-superblock LRU lists. Hence we have related filesystem object
    > types using different LRU reclaimation schemes.
    > To enable a per-superblock filesystem cache shrinker, both of these
    > caches need to have per-sb unused object LRU lists. Hence this patch
    > converts the global inode LRU to per-sb LRUs.
    > The patch only does rudimentary per-sb propotioning in the shrinker
    > infrastructure, as this gets removed when the per-sb shrinker
    > callouts are introduced later on.

    What protects s_nr_inodes_unused?

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