Re: [dm-devel] new dm-bufio

[Mikulas Patocka <mpatocka redhat com>]

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