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 3/6] proc: Reduce cache miss in sctp_snmp_seq_show
Date: Tue, 30 Aug 2016 00:03:57 +0800 [thread overview]
Message-ID: <1472486640-1111-4-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 reduce cache misses by going through
all the items of each cpu sequentially.
Signed-off-by: Jia He <hejianet@gmail.com>
---
net/sctp/proc.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/net/sctp/proc.c b/net/sctp/proc.c
index ef8ba77..085fb95 100644
--- a/net/sctp/proc.c
+++ b/net/sctp/proc.c
@@ -74,12 +74,19 @@ static const struct snmp_mib sctp_snmp_list[] = {
static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
{
struct net *net = seq->private;
- int i;
+ int i, c;
+ unsigned long buff[SCTP_MIB_MAX];
+ memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
+
+ for_each_possible_cpu(c)
+ for (i = 0; sctp_snmp_list[i].name != NULL; i++)
+ buff[i] += snmp_get_cpu_field(
+ net->sctp.sctp_statistics,
+ c, sctp_snmp_list[i].entry);
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;
}
--
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 ` [RFC PATCH 1/6] proc: Reduce cache miss in {snmp,netstat}_seq_show Jia He
2016-08-29 16:41 ` 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 ` Jia He [this message]
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
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