mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
net: proc: speedup /proc/net/netstat
Use cache friendly helpers to better use cpu caches while reading /proc/net/netstat Tested on a platform with 256 threads (AMD Rome) Before: 305 usec spent in netstat_seq_show() After: 130 usec spent in netstat_seq_show() Signed-off-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20210128162145.1703601-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
parent
df610cd916
commit
0d6cd689f9
@ -464,30 +464,52 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
|
||||
*/
|
||||
static int netstat_seq_show(struct seq_file *seq, void *v)
|
||||
{
|
||||
int i;
|
||||
const int ip_cnt = ARRAY_SIZE(snmp4_ipextstats_list) - 1;
|
||||
const int tcp_cnt = ARRAY_SIZE(snmp4_net_list) - 1;
|
||||
struct net *net = seq->private;
|
||||
unsigned long *buff;
|
||||
int i;
|
||||
|
||||
seq_puts(seq, "TcpExt:");
|
||||
for (i = 0; snmp4_net_list[i].name; i++)
|
||||
for (i = 0; i < tcp_cnt; i++)
|
||||
seq_printf(seq, " %s", snmp4_net_list[i].name);
|
||||
|
||||
seq_puts(seq, "\nTcpExt:");
|
||||
for (i = 0; snmp4_net_list[i].name; i++)
|
||||
seq_printf(seq, " %lu",
|
||||
snmp_fold_field(net->mib.net_statistics,
|
||||
snmp4_net_list[i].entry));
|
||||
|
||||
buff = kzalloc(max(tcp_cnt * sizeof(long), ip_cnt * sizeof(u64)),
|
||||
GFP_KERNEL);
|
||||
if (buff) {
|
||||
snmp_get_cpu_field_batch(buff, snmp4_net_list,
|
||||
net->mib.net_statistics);
|
||||
for (i = 0; i < tcp_cnt; i++)
|
||||
seq_printf(seq, " %lu", buff[i]);
|
||||
} else {
|
||||
for (i = 0; i < tcp_cnt; i++)
|
||||
seq_printf(seq, " %lu",
|
||||
snmp_fold_field(net->mib.net_statistics,
|
||||
snmp4_net_list[i].entry));
|
||||
}
|
||||
seq_puts(seq, "\nIpExt:");
|
||||
for (i = 0; snmp4_ipextstats_list[i].name; i++)
|
||||
for (i = 0; i < ip_cnt; i++)
|
||||
seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
|
||||
|
||||
seq_puts(seq, "\nIpExt:");
|
||||
for (i = 0; snmp4_ipextstats_list[i].name; i++)
|
||||
seq_printf(seq, " %llu",
|
||||
snmp_fold_field64(net->mib.ip_statistics,
|
||||
snmp4_ipextstats_list[i].entry,
|
||||
offsetof(struct ipstats_mib, syncp)));
|
||||
if (buff) {
|
||||
u64 *buff64 = (u64 *)buff;
|
||||
|
||||
memset(buff64, 0, ip_cnt * sizeof(u64));
|
||||
snmp_get_cpu_field64_batch(buff64, snmp4_ipextstats_list,
|
||||
net->mib.ip_statistics,
|
||||
offsetof(struct ipstats_mib, syncp));
|
||||
for (i = 0; i < ip_cnt; i++)
|
||||
seq_printf(seq, " %llu", buff64[i]);
|
||||
} else {
|
||||
for (i = 0; i < ip_cnt; i++)
|
||||
seq_printf(seq, " %llu",
|
||||
snmp_fold_field64(net->mib.ip_statistics,
|
||||
snmp4_ipextstats_list[i].entry,
|
||||
offsetof(struct ipstats_mib, syncp)));
|
||||
}
|
||||
kfree(buff);
|
||||
seq_putc(seq, '\n');
|
||||
mptcp_seq_show(seq);
|
||||
return 0;
|
||||
|
Loading…
Reference in New Issue
Block a user