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llcache: Rework fs_backing_store to use hashmap 

As a result, we no longer waste a bunch of RAM on the entries
tables.  This ought to be no slower, and more memory efficient.

Signed-off-by: Daniel Silverstone <dsilvers@digital-scurf.org>
This commit is contained in:
Daniel Silverstone 2020-02-23 20:58:53 +00:00
parent ac75a9161e
commit 859972df71
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2 changed files with 252 additions and 388 deletions
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603
content/fs_backing_store.c
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37
content/llcache.h
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@ -121,43 +121,6 @@ struct llcache_store_parameters {
size_t limit; /**< The backing store upper bound target size */
size_t hysteresis; /**< The hysteresis around the target size */
/** log2 of the default maximum number of entries the cache
* can track.
*
* If unset this defaults to 16 (65536 entries) The cache
* control file takes precedence so cache data remains
* portable between builds with differing defaults.
*/
unsigned int entry_size;
/** log2 of the default number of entries in the mapping between
* the url and cache entries.
*
* @note This is exposing an internal implementation detail of
* the filesystem based default backing store implementation.
* However it is likely any backing store implementation will
* need some way to map url to cache entries so it is a
* generally useful configuration value.
*
* Too small a value will cause unecessary collisions and
* cache misses and larger values cause proportionaly larger
* amounts of memory to be used.
*
* The "birthday paradox" means that the hash will experience
* a collision in every 2^(address_size/2) urls the cache
* stores.
*
* A value of 20 means one object stored in every 1024 will
* cause a collion and a cache miss while using two megabytes
* of storage.
*
* If unset this defaults to 20 (1048576 entries using two
* megabytes) The cache control file takes precedence so cache
* data remains portable between builds with differing
* defaults.
*/
unsigned int address_size;
};
/**