[dm-devel] new dm-bufio
Mikulas Patocka
mpatocka at redhat.com
Mon Aug 29 18:53:51 UTC 2011
On Tue, 23 Aug 2011, Christoph Hellwig wrote:
> FYI, the "shrinker" interface in include/linux/shrinker.h is how the
> VM tells subsystems to shrink their memory usage. It is used for
> various slab caches, and the XFS buffercache in
> fs/xfs/linux-2.6/xfs_buf.c
BTW. shrinker functions from xfs_qm.c - xfs_qm_shake and
xfs_qm_shake_freelist - look completely bogus. They don't read
sc->nr_to_scan to determine how many values they should scan (and compare
it with zero to test if they should scan at all) and they return the
number of entries freed - the interface specifies that they should return
the number of entries remaining the in cache.
Mikulas
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