In upstream kernel commit v3.0-rc7-226-g0e1fdafd9398, the filesystem can implement icache/dcache shrinkers on a per-superblock basis:
commit 0e1fdafd93980eac62e778798549ce0f6073905c
Author: Dave Chinner <dchinner@redhat.com>
AuthorDate: Fri Jul 8 14:14:44 2011 +1000
Commit: Al Viro <viro@zeniv.linux.org.uk>
CommitDate: Wed Jul 20 20:47:41 2011 -0400
superblock: add filesystem shrinker operations
Now we have a per-superblock shrinker implementation, we can add a
filesystem specific callout to it to allow filesystem internal
caches to be shrunk by the superblock shrinker.
Rather than perpetuate the multipurpose shrinker callback API (i.e.
nr_to_scan == 0 meaning "tell me how many objects freeable in the
cache), two operations will be added. The first will return the
number of objects that are freeable, the second is the actual
shrinker call.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
It would be useful to hook the client dcache/icache/LDLM cache into these shrinker callbacks so that it can more effectively manage cache sizes on clients.
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LU-14408 very large lustre_inode_cache
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LU-18175 Enhance Lustre to exploit new shrinker handling
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