[PATCH v4 4/7] proc: Reduce cache miss in sctp_snmp_seq_show
From: Jia He <hidden>
Date: 2016-09-26 08:12:06
Also in:
linux-sctp, lkml
Subsystem:
networking [general], sctp protocol, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Marcelo Ricardo Leitner, Xin Long, Linus Torvalds
This is to use the generic interface 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 <redacted>
---
net/sctp/proc.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index ef8ba77..0487c01 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c@@ -75,11 +75,15 @@ static int sctp_snmp_seq_show(struct seq_file *seq, void *v) { struct net *net = seq->private; int i; + unsigned long buff[SCTP_MIB_MAX]; + 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++) seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name, - snmp_fold_field(net->sctp.sctp_statistics, - sctp_snmp_list[i].entry)); + buff[i]); return 0; }
--
2.5.5