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authorEric Dumazet <edumazet@google.com>2012-06-08 09:03:21 +0400
committerDavid S. Miller <davem@davemloft.net>2012-06-09 01:27:23 +0400
commit7123aaa3a1416529ce461e98108e6b343b294643 (patch)
tree094070a521666979523411422109cce72a1db8c4 /include/net/af_unix.h
parent54db0cc2ba0d38166acc2d6bae21721405305537 (diff)
downloadlinux-7123aaa3a1416529ce461e98108e6b343b294643.tar.xz
af_unix: speedup /proc/net/unix
/proc/net/unix has quadratic behavior, and can hold unix_table_lock for a while if high number of unix sockets are alive. (90 ms for 200k sockets...) We already have a hash table, so its quite easy to use it. Problem is unbound sockets are still hashed in a single hash slot (unix_socket_table[UNIX_HASH_TABLE]) This patch also spreads unbound sockets to 256 hash slots, to speedup both /proc/net/unix and unix_diag. Time to read /proc/net/unix with 200k unix sockets : (time dd if=/proc/net/unix of=/dev/null bs=4k) before : 520 secs after : 2 secs Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Steven Whitehouse <swhiteho@redhat.com> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/af_unix.h')
-rw-r--r--include/net/af_unix.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/net/af_unix.h b/include/net/af_unix.h
index 2ee33da36a7a..b5f8988e4283 100644
--- a/include/net/af_unix.h
+++ b/include/net/af_unix.h
@@ -14,10 +14,11 @@ extern struct sock *unix_get_socket(struct file *filp);
extern struct sock *unix_peer_get(struct sock *);
#define UNIX_HASH_SIZE 256
+#define UNIX_HASH_BITS 8
extern unsigned int unix_tot_inflight;
extern spinlock_t unix_table_lock;
-extern struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
+extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
struct unix_address {
atomic_t refcnt;