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proc: Reduce cache miss in sctp_snmp_seq_show 

This is to use the generic interfaces snmp_get_cpu_field{,64}_batch to
aggregate the data by going through all the items of each cpu sequentially.

Signed-off-by: Jia He <hejianet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jia He 2016-09-30 11:29:01 +08:00 committed by David S. Miller
parent 4a4857b1c8
commit 7d64a94be2
1 changed files with 6 additions and 2 deletions
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8
net/sctp/proc.c
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@ -73,13 +73,17 @@ static const struct snmp_mib sctp_snmp_list[] = {
/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */ /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
static int sctp_snmp_seq_show(struct seq_file *seq, void *v) static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
{ {
unsigned long buff[SCTP_MIB_MAX];
struct net *net = seq->private; struct net *net = seq->private;
int i; int i;
memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
snmp_get_cpu_field_batch(buff, sctp_snmp_list,
net->sctp.sctp_statistics);
for (i = 0; sctp_snmp_list[i].name != NULL; i++) for (i = 0; sctp_snmp_list[i].name != NULL; i++)
seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name, seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
snmp_fold_field(net->sctp.sctp_statistics, buff[i]);
sctp_snmp_list[i].entry));
return 0; return 0;
} }