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proc: Reduce cache miss in snmp6_seq_show

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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 11:29:00 +08:00 committed by David S. Miller
parent f22d5c4909
commit 4a4857b1c8
1 changed files with 22 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

30
net/ipv6/proc.c
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@ -30,6 +30,11 @@
#include <net/transp_v6.h>
#include <net/ipv6.h>
#define MAX4(a, b, c, d) \
max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
IPSTATS_MIB_MAX, ICMP_MIB_MAX)
static int sockstat6_seq_show(struct seq_file *seq, void *v)
{
struct net *net = seq->private;
@ -191,25 +196,34 @@ static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
atomic_long_t *smib,
const struct snmp_mib *itemlist)
{
unsigned long buff[SNMP_MIB_MAX];
int i;
unsigned long val;
for (i = 0; itemlist[i].name; i++) {
val = pcpumib ?
snmp_fold_field(pcpumib, itemlist[i].entry) :
atomic_long_read(smib + itemlist[i].entry);
seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name, val);
if (pcpumib) {
memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
for (i = 0; itemlist[i].name; i++)
seq_printf(seq, "%-32s\t%lu\n",
itemlist[i].name, buff[i]);
} else {
for (i = 0; itemlist[i].name; i++)
seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
atomic_long_read(smib + itemlist[i].entry));
}
}
static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
const struct snmp_mib *itemlist, size_t syncpoff)
{
u64 buff64[SNMP_MIB_MAX];
int i;
memset(buff64, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
for (i = 0; itemlist[i].name; i++)
seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name,
snmp_fold_field64(mib, itemlist[i].entry, syncpoff));
seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
}
static int snmp6_seq_show(struct seq_file *seq, void *v)