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net: Use a percpu_counter for sockets_allocated

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

Note : We revert commit (248969ae31
net: af_unix can make unix_nr_socks visbile in /proc),
since it is not anymore used after sock_prot_inuse_add() addition

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 21:16:35 -08:00 • committed by David S. Miller
parent c1b56878fb
commit 1748376b66
11 changed files with 29 additions and 16 deletions
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2
include/net/tcp.h
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@ -238,7 +238,7 @@ extern int sysctl_tcp_slow_start_after_idle;
extern int sysctl_tcp_max_ssthresh;
extern atomic_t tcp_memory_allocated;
extern atomic_t tcp_sockets_allocated;
extern struct percpu_counter tcp_sockets_allocated;
extern int tcp_memory_pressure;
/*