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diff --git a/net/ipv4/ipvs/ip_vs_est.c b/net/ipv4/ipvs/ip_vs_est.c
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+/*
+ * ip_vs_est.c: simple rate estimator for IPVS
+ *
+ * Version: $Id: ip_vs_est.c,v 1.4 2002/11/30 01:50:35 wensong Exp $
+ *
+ * Authors: Wensong Zhang <wensong@linuxvirtualserver.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Changes:
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+
+#include <net/ip_vs.h>
+
+/*
+ This code is to estimate rate in a shorter interval (such as 8
+ seconds) for virtual services and real servers. For measure rate in a
+ long interval, it is easy to implement a user level daemon which
+ periodically reads those statistical counters and measure rate.
+
+ Currently, the measurement is activated by slow timer handler. Hope
+ this measurement will not introduce too much load.
+
+ We measure rate during the last 8 seconds every 2 seconds:
+
+ avgrate = avgrate*(1-W) + rate*W
+
+ where W = 2^(-2)
+
+ NOTES.
+
+ * The stored value for average bps is scaled by 2^5, so that maximal
+ rate is ~2.15Gbits/s, average pps and cps are scaled by 2^10.
+
+ * A lot code is taken from net/sched/estimator.c
+ */
+
+
+struct ip_vs_estimator
+{
+ struct ip_vs_estimator *next;
+ struct ip_vs_stats *stats;
+
+ u32 last_conns;
+ u32 last_inpkts;
+ u32 last_outpkts;
+ u64 last_inbytes;
+ u64 last_outbytes;
+
+ u32 cps;
+ u32 inpps;
+ u32 outpps;
+ u32 inbps;
+ u32 outbps;
+};
+
+
+static struct ip_vs_estimator *est_list = NULL;
+static DEFINE_RWLOCK(est_lock);
+static struct timer_list est_timer;
+
+static void estimation_timer(unsigned long arg)
+{
+ struct ip_vs_estimator *e;
+ struct ip_vs_stats *s;
+ u32 n_conns;
+ u32 n_inpkts, n_outpkts;
+ u64 n_inbytes, n_outbytes;
+ u32 rate;
+
+ read_lock(&est_lock);
+ for (e = est_list; e; e = e->next) {
+ s = e->stats;
+
+ spin_lock(&s->lock);
+ n_conns = s->conns;
+ n_inpkts = s->inpkts;
+ n_outpkts = s->outpkts;
+ n_inbytes = s->inbytes;
+ n_outbytes = s->outbytes;
+
+ /* scaled by 2^10, but divided 2 seconds */
+ rate = (n_conns - e->last_conns)<<9;
+ e->last_conns = n_conns;
+ e->cps += ((long)rate - (long)e->cps)>>2;
+ s->cps = (e->cps+0x1FF)>>10;
+
+ rate = (n_inpkts - e->last_inpkts)<<9;
+ e->last_inpkts = n_inpkts;
+ e->inpps += ((long)rate - (long)e->inpps)>>2;
+ s->inpps = (e->inpps+0x1FF)>>10;
+
+ rate = (n_outpkts - e->last_outpkts)<<9;
+ e->last_outpkts = n_outpkts;
+ e->outpps += ((long)rate - (long)e->outpps)>>2;
+ s->outpps = (e->outpps+0x1FF)>>10;
+
+ rate = (n_inbytes - e->last_inbytes)<<4;
+ e->last_inbytes = n_inbytes;
+ e->inbps += ((long)rate - (long)e->inbps)>>2;
+ s->inbps = (e->inbps+0xF)>>5;
+
+ rate = (n_outbytes - e->last_outbytes)<<4;
+ e->last_outbytes = n_outbytes;
+ e->outbps += ((long)rate - (long)e->outbps)>>2;
+ s->outbps = (e->outbps+0xF)>>5;
+ spin_unlock(&s->lock);
+ }
+ read_unlock(&est_lock);
+ mod_timer(&est_timer, jiffies + 2*HZ);
+}
+
+int ip_vs_new_estimator(struct ip_vs_stats *stats)
+{
+ struct ip_vs_estimator *est;
+
+ est = kmalloc(sizeof(*est), GFP_KERNEL);
+ if (est == NULL)
+ return -ENOMEM;
+
+ memset(est, 0, sizeof(*est));
+ est->stats = stats;
+ est->last_conns = stats->conns;
+ est->cps = stats->cps<<10;
+
+ est->last_inpkts = stats->inpkts;
+ est->inpps = stats->inpps<<10;
+
+ est->last_outpkts = stats->outpkts;
+ est->outpps = stats->outpps<<10;
+
+ est->last_inbytes = stats->inbytes;
+ est->inbps = stats->inbps<<5;
+
+ est->last_outbytes = stats->outbytes;
+ est->outbps = stats->outbps<<5;
+
+ write_lock_bh(&est_lock);
+ est->next = est_list;
+ if (est->next == NULL) {
+ init_timer(&est_timer);
+ est_timer.expires = jiffies + 2*HZ;
+ est_timer.function = estimation_timer;
+ add_timer(&est_timer);
+ }
+ est_list = est;
+ write_unlock_bh(&est_lock);
+ return 0;
+}
+
+void ip_vs_kill_estimator(struct ip_vs_stats *stats)
+{
+ struct ip_vs_estimator *est, **pest;
+ int killed = 0;
+
+ write_lock_bh(&est_lock);
+ pest = &est_list;
+ while ((est=*pest) != NULL) {
+ if (est->stats != stats) {
+ pest = &est->next;
+ continue;
+ }
+ *pest = est->next;
+ kfree(est);
+ killed++;
+ }
+ if (killed && est_list == NULL)
+ del_timer_sync(&est_timer);
+ write_unlock_bh(&est_lock);
+}
+
+void ip_vs_zero_estimator(struct ip_vs_stats *stats)
+{
+ struct ip_vs_estimator *e;
+
+ write_lock_bh(&est_lock);
+ for (e = est_list; e; e = e->next) {
+ if (e->stats != stats)
+ continue;
+
+ /* set counters zero */
+ e->last_conns = 0;
+ e->last_inpkts = 0;
+ e->last_outpkts = 0;
+ e->last_inbytes = 0;
+ e->last_outbytes = 0;
+ e->cps = 0;
+ e->inpps = 0;
+ e->outpps = 0;
+ e->inbps = 0;
+ e->outbps = 0;
+ }
+ write_unlock_bh(&est_lock);
+}
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