diff options
| author | Eric Dumazet <dada1@cosmosbay.com> | 2008-11-17 03:40:17 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-11-17 03:40:17 (GMT) |
| commit | 3ab5aee7fe840b5b1b35a8d1ac11c3de5281e611 (patch) | |
| tree | 468296b7be813643248d4ca67497d6ddb6934fc6 /net/dccp/proto.c | |
| parent | 88ab1932eac721c6e7336708558fa5ed02c85c80 (diff) | |
| download | linux-3ab5aee7fe840b5b1b35a8d1ac11c3de5281e611.tar.xz | |
net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls
RCU was added to UDP lookups, using a fast infrastructure :
- sockets kmem_cache use SLAB_DESTROY_BY_RCU and dont pay the
price of call_rcu() at freeing time.
- hlist_nulls permits to use few memory barriers.
This patch uses same infrastructure for TCP/DCCP established
and timewait sockets.
Thanks to SLAB_DESTROY_BY_RCU, no slowdown for applications
using short lived TCP connections. A followup patch, converting
rwlocks to spinlocks will even speedup this case.
__inet_lookup_established() is pretty fast now we dont have to
dirty a contended cache line (read_lock/read_unlock)
Only established and timewait hashtable are converted to RCU
(bind table and listen table are still using traditional locking)
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/dccp/proto.c')
| -rw-r--r-- | net/dccp/proto.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/dccp/proto.c b/net/dccp/proto.c index 46cb349..1117d4d 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -1090,8 +1090,8 @@ static int __init dccp_init(void) } for (i = 0; i < dccp_hashinfo.ehash_size; i++) { - INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain); - INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].twchain); + INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i); + INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i); } if (inet_ehash_locks_alloc(&dccp_hashinfo)) |