[PATCH 3/4] ipvs: zero percpu stats

[Julian Anastasov <ja@xxxxxx>]

        Zero the new percpu stats because we copy from there.

Signed-off-by: Julian Anastasov <ja@xxxxxx>
---

diff -urp lvs-test-2.6-8a80c79/linux/net/netfilter/ipvs/ip_vs_ctl.c 
linux/net/netfilter/ipvs/ip_vs_ctl.c
--- lvs-test-2.6-8a80c79/linux/net/netfilter/ipvs/ip_vs_ctl.c   2011-03-03 
23:10:42.000000000 +0200
+++ linux/net/netfilter/ipvs/ip_vs_ctl.c        2011-03-04 00:19:51.078379585 
+0200
@@ -713,8 +713,25 @@ static void ip_vs_trash_cleanup(struct n
 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);

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