netdev - [PATCH 03/18] ipvs: zero percpu stats

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Date:	Sun,  6 Mar 2011 08:45:45 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netfilter@...r.kernel.org, lvs-devel@...r.kernel.org
Cc:	Julian Anastasov <ja@....bg>,
	Hans Schillstrom <hans@...illstrom.com>,
	Simon Horman <horms@...ge.net.au>
Subject: [PATCH 03/18] ipvs: zero percpu stats

From: Julian Anastasov <ja@....bg>

 	Zero the new percpu stats because we copy from there.

Signed-off-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
 net/netfilter/ipvs/ip_vs_ctl.c |   17 +++++++++++++++++
 1 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index a2a67ad..fd74527 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -715,8 +715,25 @@ static void ip_vs_trash_cleanup(struct net *net)
 static void
 ip_vs_zero_stats(struct ip_vs_stats *stats)
 {
+	struct ip_vs_cpu_stats *cpustats = stats->cpustats;
+	int i;
+
 	spin_lock_bh(&stats->lock);
 
+	for_each_possible_cpu(i) {
+		struct ip_vs_cpu_stats *u = per_cpu_ptr(cpustats, i);
+		unsigned int start;
+
+		/* Do not pretend to be writer, it is enough to
+		 * sync with writers that modify the u64 counters
+		 * because under stats->lock we are the only reader.
+		 */
+		do {
+			start = u64_stats_fetch_begin(&u->syncp);
+			memset(&u->ustats, 0, sizeof(u->ustats));
+		} while (u64_stats_fetch_retry(&u->syncp, start));
+	}
+
 	memset(&stats->ustats, 0, sizeof(stats->ustats));
 	ip_vs_zero_estimator(stats);
 
-- 
1.7.2.3

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