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lib: Resizable, Scalable, Concurrent Hash Table

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Generic implementation of a resizable, scalable, concurrent hash table
based on [0]. The implementation supports both, fixed size keys specified
via an offset and length, or arbitrary keys via own hash and compare
functions.

Lookups are lockless and protected as RCU read side critical sections.
Automatic growing/shrinking based on user configurable watermarks is
available while allowing concurrent lookups to take place.

Objects to be hashed must include a struct rhash_head. The reason for not
using the existing struct hlist_head is that the expansion and shrinking
will have two buckets point to a single entry which would lead in obscure
reverse chaining behaviour.

Code includes a boot selftest if CONFIG_TEST_RHASHTABLE is defined.

[0] https://www.usenix.org/legacy/event/atc11/tech/final_files/Triplett.pdf

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Reviewed-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
2014-08-02 11:47:44 +02:00
committed by David S. Miller
parent d39a9ffce7
commit 7e1e77636e
4 changed files with 1019 additions and 1 deletions
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8
lib/Kconfig.debug
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@@ -1550,6 +1550,14 @@ config TEST_STRING_HELPERS
config TEST_KSTRTOX
tristate "Test kstrto*() family of functions at runtime"
config TEST_RHASHTABLE
bool "Perform selftest on resizable hash table"
default n
help
Enable this option to test the rhashtable functions at boot.
If unsure, say N.
endmenu # runtime tests
config PROVIDE_OHCI1394_DMA_INIT