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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
parent 1748376b66
commit dd24c00191
8 changed files with 24 additions and 18 deletions
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2
net/ipv4/proc.c
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@@ -54,7 +54,7 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
socket_seq_show(seq);
seq_printf(seq, "TCP: inuse %d orphan %d tw %d alloc %d mem %d\n",
sock_prot_inuse_get(net, &tcp_prot),
atomic_read(&tcp_orphan_count),
(int)percpu_counter_sum_positive(&tcp_orphan_count),
tcp_death_row.tw_count,
(int)percpu_counter_sum_positive(&tcp_sockets_allocated),
atomic_read(&tcp_memory_allocated));