[PATCH] Caches that shrink automatically

From: Andreas Gruenbacher (agruen@suse.de)
Date: Sun Aug 04 2002 - 06:08:51 EST


Currently there is no way for modules to define dynamically sized caches that
shrink upon memory pressure. We need this for implementing Extended Attribute
caches on ext2, ext3, and ReiserFS. Other caches could also make use of the
same mechanism (e.g., nfsd's permission cache, dcache, icache, dqache).

I propose this patch, which adds the register_cache() and unregister_cache()
functions. They allow to register a callback which is invoked on memory
pressure. This callback shall then try to free some memory; the parameters
and semantics are similar to the other shrink functions in mm/vmscan.c.


 Andreas Gruenbacher SuSE Linux AG
 mailto:agruen@suse.de Deutschherrnstr. 15-19
 http://www.suse.de/ D-90429 Nuernberg, Germany

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