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authorEric Dumazet <dada1@cosmosbay.com>2008-10-08 14:18:04 -0700
committerDavid S. Miller <davem@davemloft.net>2008-10-08 14:18:04 -0700
commit3c689b7320ae6f20dba6a8b71806a6c6fd604ee8 (patch)
treef9417dbd9f4aca952a1aba3e9a0f2a5a6e088dcd /net/ipv4
parent9088c5609584684149f3fb5b065aa7f18dcb03ff (diff)
inet: cleanup of local_port_range
I noticed sysctl_local_port_range[] and its associated seqlock sysctl_local_port_range_lock were on separate cache lines. Moreover, sysctl_local_port_range[] was close to unrelated variables, highly modified, leading to cache misses. Moving these two variables in a structure can help data locality and moving this structure to read_mostly section helps sharing of this data among cpus. Cleanup of extern declarations (moved in include file where they belong), and use of inet_get_local_port_range() accessor instead of direct access to ports values. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/inet_connection_sock.c16
-rw-r--r--net/ipv4/sysctl_net_ipv4.c23
2 files changed, 19 insertions, 20 deletions
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index 21fcc5a9045f..bd1278a2d828 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -30,20 +30,22 @@ EXPORT_SYMBOL(inet_csk_timer_bug_msg);
#endif
/*
- * This array holds the first and last local port number.
+ * This struct holds the first and last local port number.
*/
-int sysctl_local_port_range[2] = { 32768, 61000 };
-DEFINE_SEQLOCK(sysctl_port_range_lock);
+struct local_ports sysctl_local_ports __read_mostly = {
+ .lock = SEQLOCK_UNLOCKED,
+ .range = { 32768, 61000 },
+};
void inet_get_local_port_range(int *low, int *high)
{
unsigned seq;
do {
- seq = read_seqbegin(&sysctl_port_range_lock);
+ seq = read_seqbegin(&sysctl_local_ports.lock);
- *low = sysctl_local_port_range[0];
- *high = sysctl_local_port_range[1];
- } while (read_seqretry(&sysctl_port_range_lock, seq));
+ *low = sysctl_local_ports.range[0];
+ *high = sysctl_local_ports.range[1];
+ } while (read_seqretry(&sysctl_local_ports.lock, seq));
}
EXPORT_SYMBOL(inet_get_local_port_range);
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index e0689fd7b798..276d047fb85a 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -26,16 +26,13 @@ static int tcp_retr1_max = 255;
static int ip_local_port_range_min[] = { 1, 1 };
static int ip_local_port_range_max[] = { 65535, 65535 };
-extern seqlock_t sysctl_port_range_lock;
-extern int sysctl_local_port_range[2];
-
/* Update system visible IP port range */
static void set_local_port_range(int range[2])
{
- write_seqlock(&sysctl_port_range_lock);
- sysctl_local_port_range[0] = range[0];
- sysctl_local_port_range[1] = range[1];
- write_sequnlock(&sysctl_port_range_lock);
+ write_seqlock(&sysctl_local_ports.lock);
+ sysctl_local_ports.range[0] = range[0];
+ sysctl_local_ports.range[1] = range[1];
+ write_sequnlock(&sysctl_local_ports.lock);
}
/* Validate changes from /proc interface. */
@@ -44,8 +41,7 @@ static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
size_t *lenp, loff_t *ppos)
{
int ret;
- int range[2] = { sysctl_local_port_range[0],
- sysctl_local_port_range[1] };
+ int range[2];
ctl_table tmp = {
.data = &range,
.maxlen = sizeof(range),
@@ -54,6 +50,7 @@ static int ipv4_local_port_range(ctl_table *table, int write, struct file *filp,
.extra2 = &ip_local_port_range_max,
};
+ inet_get_local_port_range(range, range + 1);
ret = proc_dointvec_minmax(&tmp, write, filp, buffer, lenp, ppos);
if (write && ret == 0) {
@@ -73,8 +70,7 @@ static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
void __user *newval, size_t newlen)
{
int ret;
- int range[2] = { sysctl_local_port_range[0],
- sysctl_local_port_range[1] };
+ int range[2];
ctl_table tmp = {
.data = &range,
.maxlen = sizeof(range),
@@ -83,6 +79,7 @@ static int ipv4_sysctl_local_port_range(ctl_table *table, int __user *name,
.extra2 = &ip_local_port_range_max,
};
+ inet_get_local_port_range(range, range + 1);
ret = sysctl_intvec(&tmp, name, nlen, oldval, oldlenp, newval, newlen);
if (ret == 0 && newval && newlen) {
if (range[1] < range[0])
@@ -396,8 +393,8 @@ static struct ctl_table ipv4_table[] = {
{
.ctl_name = NET_IPV4_LOCAL_PORT_RANGE,
.procname = "ip_local_port_range",
- .data = &sysctl_local_port_range,
- .maxlen = sizeof(sysctl_local_port_range),
+ .data = &sysctl_local_ports.range,
+ .maxlen = sizeof(sysctl_local_ports.range),
.mode = 0644,
.proc_handler = &ipv4_local_port_range,
.strategy = &ipv4_sysctl_local_port_range,

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