7 Commits

Author	SHA1	Message	Date
Zdenek Kabelac	9eafd44734	gcc: use more zero length arrays ... Define last array struct member with zero size.	2021-09-22 17:18:50 +02:00
Zdenek Kabelac	ff21723512	hash: replace hash with better function ... Add Bob Jenkins hash function to get better working hash function, which does genarate way less colisions (especially with similar strings). For a comparision also a kernel function used in DM kernel is include. While it's better then our existing one, it's still far worse, then Bob Jenkins hash.	2021-03-08 15:33:15 +01:00
Zdenek Kabelac	d602837b91	hash: speed up hash tables ... Enhance hash perfomance by remembering the computed hash value for the hashed node - this allows to speedup lookup of nodes with the hash collision when different keys map to the same masked hash value. For the easier use 'num_slots' become 'mask_slots', so we only add '1' in rare case of need of the original num_slots value. Also add statistic counters for hashes and print stats in debug build (-DDEBUG) on hash wiping. (so badly performing hash can be optimized.)	2021-03-08 15:33:15 +01:00
Zdenek Kabelac	84679d254f	hash: use unsigned size ... There is not much point in using 64bit hash size, since we hash with way less bits anyway. So keep size 32bit.	2021-03-08 15:33:15 +01:00
Zdenek Kabelac	1ff1e86deb	cleanup: better expressing passing key arg to _hash	2020-09-01 17:57:50 +02:00
Zdenek Kabelac	fd96f1014b	gcc: zero-sized array to fexlible array C99 ... Switch remaining zero sized struct to flexible arrays to be C99 complient. These simple rules should apply: - The incomplete array type must be the last element within the structure. - There cannot be an array of structures that contain a flexible array member. - Structures that contain a flexible array member cannot be used as a member of another structure. - The structure must contain at least one named member in addition to the flexible array member. Although some of the code pieces should be still improved.	2020-09-01 17:57:50 +02:00
Joe Thornber	61e67e51e1	device_mapper: move hash.[hc] to base/data-struct	2018-06-08 13:54:19 +01:00