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net: Use a percpu_counter for orphan_count

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Instead of using one atomic_t per protocol, use a percpu_counter
for "orphan_count", to reduce cache line contention on
heavy duty network servers. 

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2008-11-25 21:17:14 -08:00 • committed by David S. Miller
commit dd24c00191
8 changed files with 24 additions and 18 deletions
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2
include/net/sock.h
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@ -666,7 +666,7 @@ struct proto {
unsigned int obj_size;
int slab_flags;
atomic_t *orphan_count;
struct percpu_counter *orphan_count;
struct request_sock_ops *rsk_prot;
struct timewait_sock_ops *twsk_prot;