|author||Ying Xue <email@example.com>||2015-01-07 13:41:58 +0800|
|committer||David S. Miller <firstname.lastname@example.org>||2015-01-08 19:47:14 -0800|
|parent||rhashtable: initialize atomic nelems variable (diff)|
tipc: convert tipc reference table to use generic rhashtable
As tipc reference table is statically allocated, its memory size requested on stack initialization stage is quite big even if the maximum port number is just restricted to 8191 currently, however, the number already becomes insufficient in practice. But if the maximum ports is allowed to its theory value - 2^32, its consumed memory size will reach a ridiculously unacceptable value. Apart from this, heavy tipc users spend a considerable amount of time in tipc_sk_get() due to the read-lock on ref_table_lock. If tipc reference table is converted with generic rhashtable, above mentioned both disadvantages would be resolved respectively: making use of the new resizable hash table can avoid locking on the lookup; smaller memory size is required at initial stage, for example, 256 hash bucket slots are requested at the beginning phase instead of allocating the entire 8191 slots in old mode. The hash table will grow if entries exceeds 75% of table size up to a total table size of 1M, and it will automatically shrink if usage falls below 30%, but the minimum table size is allowed down to 256. Also converts ref_table_lock to a separate mutex to protect hash table mutations on write side. Lastly defers the release of the socket reference using call_rcu() to allow using an RCU read-side protected call to rhashtable_lookup(). Signed-off-by: Ying Xue <email@example.com> Acked-by: Jon Maloy <firstname.lastname@example.org> Acked-by: Erik Hugne <email@example.com> Cc: Thomas Graf <firstname.lastname@example.org> Acked-by: Thomas Graf <email@example.com> Signed-off-by: David S. Miller <firstname.lastname@example.org>
Diffstat (limited to 'net/tipc/Kconfig')
1 files changed, 0 insertions, 12 deletions
diff --git a/net/tipc/Kconfig b/net/tipc/Kconfig
index c890848f9d56..91c8a8e031db 100644
@@ -20,18 +20,6 @@ menuconfig TIPC
If in doubt, say N.
- int "Maximum number of ports in a node"
- depends on TIPC
- range 127 65535
- default "8191"
- Specifies how many ports can be supported by a node.
- Can range from 127 to 65535 ports; default is 8191.
- Setting this to a smaller value saves some memory,
- setting it to higher allows for more ports.
bool "InfiniBand media type support"
depends on TIPC && INFINIBAND_IPOIB