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Groups > linux.kernel > #1493871

[PATCH v6 1/7] net:snmp: Introduce generic interfaces for snmp_get_cpu_field{,64}

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This is to introduce the generic interfaces for snmp_get_cpu_field{,64}.
It exchanges the two for-loops for collecting the percpu statistics data.
This can aggregate the data by going through all the items of each cpu
sequentially.

Signed-off-by: Jia He <hejianet@gmail.com>
Suggested-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
---
 include/net/ip.h | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/net/ip.h b/include/net/ip.h
index 9742b92..bc43c0f 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -219,6 +219,29 @@ static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_o
 }
 #endif
 
+#define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
+{ \
+	int i, c; \
+	for_each_possible_cpu(c) { \
+		for (i = 0; stats_list[i].name; i++) \
+			buff64[i] += snmp_get_cpu_field64( \
+					mib_statistic, \
+					c, stats_list[i].entry, \
+					offset); \
+	} \
+}
+
+#define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
+{ \
+	int i, c; \
+	for_each_possible_cpu(c) { \
+		for (i = 0; stats_list[i].name; i++) \
+			buff[i] += snmp_get_cpu_field( \
+						mib_statistic, \
+						c, stats_list[i].entry); \
+	} \
+}
+
 void inet_get_local_port_range(struct net *net, int *low, int *high);
 
 #ifdef CONFIG_SYSCTL
-- 
2.5.5

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[PATCH v6 0/7] Reduce cache miss for snmp_fold_field Jia He <hejianet@gmail.com> - 2016-09-30 05:30 +0200
  [PATCH v6 4/7] proc: Reduce cache miss in sctp_snmp_seq_show Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 6/7] ipv6: Remove useless parameter in __snmp6_fill_statsdev Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 5/7] proc: Reduce cache miss in xfrm_statistics_seq_show Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 2/7] proc: Reduce cache miss in snmp_seq_show Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 1/7] net:snmp: Introduce generic interfaces for snmp_get_cpu_field{,64} Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 3/7] proc: Reduce cache miss in snmp6_seq_show Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  [PATCH v6 7/7] net: Suppress the "Comparison to NULL could be written" warnings Jia He <hejianet@gmail.com> - 2016-09-30 05:40 +0200
  Re: [PATCH v6 0/7] Reduce cache miss for snmp_fold_field David Miller <davem@davemloft.net> - 2016-09-30 08:20 +0200

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