From: Jia He <hejianet@gmail.com>
To: netdev@vger.kernel.org
Cc: linux-sctp@vger.kernel.org, linux-kernel@vger.kernel.org,
davem@davemloft.net, Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>,
James Morris <jmorris@namei.org>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Patrick McHardy <kaber@trash.net>,
Vlad Yasevich <vyasevich@gmail.com>,
Neil Horman <nhorman@tuxdriver.com>,
Steffen Klassert <steffen.klassert@secunet.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Jia He <hejianet@gmail.com>
Subject: [RFC PATCH 1/6] proc: Reduce cache miss in {snmp,netstat}_seq_show
Date: Tue, 30 Aug 2016 00:03:55 +0800 [thread overview]
Message-ID: <1472486640-1111-2-git-send-email-hejianet@gmail.com> (raw)
In-Reply-To: <1472486640-1111-1-git-send-email-hejianet@gmail.com>
This patch exchanges the two loop for collecting the percpu statistics
data. This can aggregate the data by going through all the items of each
cpu sequentially. In snmp_seq_show, just use one buff copy to dislay the
Udp and UdpLite data because they are the same.
Signed-off-by: Jia He <hejianet@gmail.com>
---
net/ipv4/proc.c | 78 ++++++++++++++++++++++++++++++++++++---------------------
1 file changed, 50 insertions(+), 28 deletions(-)
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index 9f665b6..ed09566 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -380,11 +380,15 @@ static void icmp_put(struct seq_file *seq)
*/
static int snmp_seq_show(struct seq_file *seq, void *v)
{
- int i;
+ int i, c;
+ unsigned long buff[TCP_MIB_MAX];
+ u64 buff64[IPSTATS_MIB_MAX];
struct net *net = seq->private;
- seq_puts(seq, "Ip: Forwarding DefaultTTL");
+ memset(buff, 0, TCP_MIB_MAX * sizeof(unsigned long));
+ memset(buff64, 0, IPSTATS_MIB_MAX * sizeof(u64));
+ seq_puts(seq, "Ip: Forwarding DefaultTTL");
for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
seq_printf(seq, " %s", snmp4_ipstats_list[i].name);
@@ -393,11 +397,16 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
net->ipv4.sysctl_ip_default_ttl);
BUILD_BUG_ON(offsetof(struct ipstats_mib, mibs) != 0);
+
+ for_each_possible_cpu(c) {
+ for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
+ buff64[i] += snmp_get_cpu_field64(
+ net->mib.ip_statistics,
+ c, snmp4_ipstats_list[i].entry,
+ offsetof(struct ipstats_mib, syncp));
+ }
for (i = 0; snmp4_ipstats_list[i].name != NULL; i++)
- seq_printf(seq, " %llu",
- snmp_fold_field64(net->mib.ip_statistics,
- snmp4_ipstats_list[i].entry,
- offsetof(struct ipstats_mib, syncp)));
+ seq_printf(seq, " %llu", buff64[i]);
icmp_put(seq); /* RFC 2011 compatibility */
icmpmsg_put(seq);
@@ -407,38 +416,41 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, " %s", snmp4_tcp_list[i].name);
seq_puts(seq, "\nTcp:");
+ for_each_possible_cpu(c) {
+ for (i = 0; snmp4_tcp_list[i].name != NULL; i++)
+ buff[i] += snmp_get_cpu_field(net->mib.tcp_statistics,
+ c, snmp4_tcp_list[i].entry);
+ }
+
for (i = 0; snmp4_tcp_list[i].name != NULL; i++) {
/* MaxConn field is signed, RFC 2012 */
if (snmp4_tcp_list[i].entry == TCP_MIB_MAXCONN)
- seq_printf(seq, " %ld",
- snmp_fold_field(net->mib.tcp_statistics,
- snmp4_tcp_list[i].entry));
+ seq_printf(seq, " %ld", buff[i]);
else
- seq_printf(seq, " %lu",
- snmp_fold_field(net->mib.tcp_statistics,
- snmp4_tcp_list[i].entry));
+ seq_printf(seq, " %lu", buff[i]);
}
+ memset(buff, 0, TCP_MIB_MAX * sizeof(unsigned long));
+
+ for_each_possible_cpu(c) {
+ for (i = 0; snmp4_udp_list[i].name != NULL; i++)
+ buff[i] += snmp_get_cpu_field(net->mib.udp_statistics,
+ c, snmp4_udp_list[i].entry);
+ }
seq_puts(seq, "\nUdp:");
for (i = 0; snmp4_udp_list[i].name != NULL; i++)
seq_printf(seq, " %s", snmp4_udp_list[i].name);
-
seq_puts(seq, "\nUdp:");
for (i = 0; snmp4_udp_list[i].name != NULL; i++)
- seq_printf(seq, " %lu",
- snmp_fold_field(net->mib.udp_statistics,
- snmp4_udp_list[i].entry));
+ seq_printf(seq, " %lu", buff[i]);
/* the UDP and UDP-Lite MIBs are the same */
seq_puts(seq, "\nUdpLite:");
for (i = 0; snmp4_udp_list[i].name != NULL; i++)
seq_printf(seq, " %s", snmp4_udp_list[i].name);
-
seq_puts(seq, "\nUdpLite:");
for (i = 0; snmp4_udp_list[i].name != NULL; i++)
- seq_printf(seq, " %lu",
- snmp_fold_field(net->mib.udplite_statistics,
- snmp4_udp_list[i].entry));
+ seq_printf(seq, " %lu", buff[i]);
seq_putc(seq, '\n');
return 0;
@@ -464,29 +476,39 @@ static const struct file_operations snmp_seq_fops = {
*/
static int netstat_seq_show(struct seq_file *seq, void *v)
{
- int i;
+ int i, c;
+ unsigned long buff[LINUX_MIB_MAX];
+ u64 buff64[IPSTATS_MIB_MAX];
struct net *net = seq->private;
+ memset(buff, 0, sizeof(unsigned long) * LINUX_MIB_MAX);
+ memset(buff64, 0, sizeof(u64) * IPSTATS_MIB_MAX);
+
seq_puts(seq, "TcpExt:");
for (i = 0; snmp4_net_list[i].name != NULL; i++)
seq_printf(seq, " %s", snmp4_net_list[i].name);
seq_puts(seq, "\nTcpExt:");
+ for_each_possible_cpu(c)
+ for (i = 0; snmp4_net_list[i].name != NULL; i++)
+ buff[i] += snmp_get_cpu_field(net->mib.net_statistics,
+ c, snmp4_net_list[i].entry);
for (i = 0; snmp4_net_list[i].name != NULL; i++)
- seq_printf(seq, " %lu",
- snmp_fold_field(net->mib.net_statistics,
- snmp4_net_list[i].entry));
+ seq_printf(seq, " %lu", buff[i]);
seq_puts(seq, "\nIpExt:");
for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
seq_printf(seq, " %s", snmp4_ipextstats_list[i].name);
seq_puts(seq, "\nIpExt:");
+ for_each_possible_cpu(c)
+ for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
+ buff64[i] += snmp_get_cpu_field64(
+ net->mib.ip_statistics,
+ c, snmp4_ipextstats_list[i].entry,
+ offsetof(struct ipstats_mib, syncp));
for (i = 0; snmp4_ipextstats_list[i].name != NULL; i++)
- seq_printf(seq, " %llu",
- snmp_fold_field64(net->mib.ip_statistics,
- snmp4_ipextstats_list[i].entry,
- offsetof(struct ipstats_mib, syncp)));
+ seq_printf(seq, " %llu", buff64[i]);
seq_putc(seq, '\n');
return 0;
--
1.8.3.1
next prev parent reply other threads:[~2016-08-29 16:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-29 16:03 [RFC PATCH 0/6] Reduce cache miss for snmp_fold_field Jia He
2016-08-29 16:03 ` Jia He [this message]
2016-08-29 16:41 ` [RFC PATCH 1/6] proc: Reduce cache miss in {snmp,netstat}_seq_show Eric Dumazet
2016-08-30 8:15 ` hejianet
2016-08-29 16:03 ` [RFC PATCH 2/6] proc: Reduce cache miss in snmp6_seq_show Jia He
2016-08-29 16:03 ` [RFC PATCH 3/6] proc: Reduce cache miss in sctp_snmp_seq_show Jia He
2016-08-29 16:03 ` [RFC PATCH 4/6] proc: Reduce cache miss in xfrm_statistics_seq_show Jia He
2016-08-29 16:03 ` [RFC PATCH 5/6] ipv6: Remove useless parameter in __snmp6_fill_statsdev Jia He
2016-08-29 16:04 ` [RFC PATCH 6/6] net: Suppress the "Comparison to NULL Jia He
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1472486640-1111-2-git-send-email-hejianet@gmail.com \
--to=hejianet@gmail.com \
--cc=davem@davemloft.net \
--cc=herbert@gondor.apana.org.au \
--cc=jmorris@namei.org \
--cc=kaber@trash.net \
--cc=kuznet@ms2.inr.ac.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-sctp@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=nhorman@tuxdriver.com \
--cc=steffen.klassert@secunet.com \
--cc=vyasevich@gmail.com \
--cc=yoshfuji@linux-ipv6.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).