Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_est.c: simple rate estimator for IPVS |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 11 | * Changes: Hans Schillstrom <hans.schillstrom@ericsson.com> |
| 12 | * Network name space (netns) aware. |
| 13 | * Global data moved to netns i.e struct netns_ipvs |
| 14 | * Affected data: est_list and est_lock. |
| 15 | * estimation_timer() runs with timer per netns. |
| 16 | * get_stats()) do the per cpu summing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 18 | |
| 19 | #define KMSG_COMPONENT "IPVS" |
| 20 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 23 | #include <linux/jiffies.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/types.h> |
Adrian Bunk | 4ffd2e4 | 2006-01-05 12:14:43 -0800 | [diff] [blame] | 25 | #include <linux/interrupt.h> |
Pavel Emelyanov | 90754f8 | 2008-01-12 02:33:50 -0800 | [diff] [blame] | 26 | #include <linux/sysctl.h> |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 27 | #include <linux/list.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | #include <net/ip_vs.h> |
| 30 | |
| 31 | /* |
| 32 | This code is to estimate rate in a shorter interval (such as 8 |
| 33 | seconds) for virtual services and real servers. For measure rate in a |
| 34 | long interval, it is easy to implement a user level daemon which |
| 35 | periodically reads those statistical counters and measure rate. |
| 36 | |
| 37 | Currently, the measurement is activated by slow timer handler. Hope |
| 38 | this measurement will not introduce too much load. |
| 39 | |
| 40 | We measure rate during the last 8 seconds every 2 seconds: |
| 41 | |
| 42 | avgrate = avgrate*(1-W) + rate*W |
| 43 | |
| 44 | where W = 2^(-2) |
| 45 | |
| 46 | NOTES. |
| 47 | |
| 48 | * The stored value for average bps is scaled by 2^5, so that maximal |
| 49 | rate is ~2.15Gbits/s, average pps and cps are scaled by 2^10. |
| 50 | |
| 51 | * A lot code is taken from net/sched/estimator.c |
| 52 | */ |
| 53 | |
| 54 | |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 55 | /* |
| 56 | * Make a summary from each cpu |
| 57 | */ |
| 58 | static void ip_vs_read_cpu_stats(struct ip_vs_stats_user *sum, |
| 59 | struct ip_vs_cpu_stats *stats) |
| 60 | { |
| 61 | int i; |
| 62 | |
| 63 | for_each_possible_cpu(i) { |
| 64 | struct ip_vs_cpu_stats *s = per_cpu_ptr(stats, i); |
| 65 | unsigned int start; |
| 66 | __u64 inbytes, outbytes; |
| 67 | if (i) { |
| 68 | sum->conns += s->ustats.conns; |
| 69 | sum->inpkts += s->ustats.inpkts; |
| 70 | sum->outpkts += s->ustats.outpkts; |
| 71 | do { |
Julian Anastasov | 4a569c0 | 2011-03-04 12:28:20 +0200 | [diff] [blame] | 72 | start = u64_stats_fetch_begin(&s->syncp); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 73 | inbytes = s->ustats.inbytes; |
| 74 | outbytes = s->ustats.outbytes; |
Julian Anastasov | 4a569c0 | 2011-03-04 12:28:20 +0200 | [diff] [blame] | 75 | } while (u64_stats_fetch_retry(&s->syncp, start)); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 76 | sum->inbytes += inbytes; |
| 77 | sum->outbytes += outbytes; |
| 78 | } else { |
| 79 | sum->conns = s->ustats.conns; |
| 80 | sum->inpkts = s->ustats.inpkts; |
| 81 | sum->outpkts = s->ustats.outpkts; |
| 82 | do { |
Julian Anastasov | 4a569c0 | 2011-03-04 12:28:20 +0200 | [diff] [blame] | 83 | start = u64_stats_fetch_begin(&s->syncp); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 84 | sum->inbytes = s->ustats.inbytes; |
| 85 | sum->outbytes = s->ustats.outbytes; |
Julian Anastasov | 4a569c0 | 2011-03-04 12:28:20 +0200 | [diff] [blame] | 86 | } while (u64_stats_fetch_retry(&s->syncp, start)); |
Hans Schillstrom | b17fc99 | 2011-01-03 14:44:56 +0100 | [diff] [blame] | 87 | } |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | static void estimation_timer(unsigned long arg) |
| 93 | { |
| 94 | struct ip_vs_estimator *e; |
| 95 | struct ip_vs_stats *s; |
| 96 | u32 n_conns; |
| 97 | u32 n_inpkts, n_outpkts; |
| 98 | u64 n_inbytes, n_outbytes; |
| 99 | u32 rate; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 100 | struct net *net = (struct net *)arg; |
| 101 | struct netns_ipvs *ipvs; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 103 | ipvs = net_ipvs(net); |
| 104 | spin_lock(&ipvs->est_lock); |
| 105 | list_for_each_entry(e, &ipvs->est_list, list) { |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 106 | s = container_of(e, struct ip_vs_stats, est); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | |
| 108 | spin_lock(&s->lock); |
Julian Anastasov | 2a0751a | 2011-03-04 12:20:35 +0200 | [diff] [blame] | 109 | ip_vs_read_cpu_stats(&s->ustats, s->cpustats); |
Sven Wegener | e9c0ce2 | 2008-09-08 13:39:04 +0200 | [diff] [blame] | 110 | n_conns = s->ustats.conns; |
| 111 | n_inpkts = s->ustats.inpkts; |
| 112 | n_outpkts = s->ustats.outpkts; |
| 113 | n_inbytes = s->ustats.inbytes; |
| 114 | n_outbytes = s->ustats.outbytes; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
| 116 | /* scaled by 2^10, but divided 2 seconds */ |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 117 | rate = (n_conns - e->last_conns) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | e->last_conns = n_conns; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 119 | e->cps += ((long)rate - (long)e->cps) >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 121 | rate = (n_inpkts - e->last_inpkts) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | e->last_inpkts = n_inpkts; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 123 | e->inpps += ((long)rate - (long)e->inpps) >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 125 | rate = (n_outpkts - e->last_outpkts) << 9; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | e->last_outpkts = n_outpkts; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 127 | e->outpps += ((long)rate - (long)e->outpps) >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 129 | rate = (n_inbytes - e->last_inbytes) << 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | e->last_inbytes = n_inbytes; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 131 | e->inbps += ((long)rate - (long)e->inbps) >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 133 | rate = (n_outbytes - e->last_outbytes) << 4; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | e->last_outbytes = n_outbytes; |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 135 | e->outbps += ((long)rate - (long)e->outbps) >> 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | spin_unlock(&s->lock); |
| 137 | } |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 138 | spin_unlock(&ipvs->est_lock); |
| 139 | mod_timer(&ipvs->est_timer, jiffies + 2*HZ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | } |
| 141 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 142 | void ip_vs_new_estimator(struct net *net, struct ip_vs_stats *stats) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 144 | struct netns_ipvs *ipvs = net_ipvs(net); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 145 | struct ip_vs_estimator *est = &stats->est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 147 | INIT_LIST_HEAD(&est->list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 149 | spin_lock_bh(&ipvs->est_lock); |
| 150 | list_add(&est->list, &ipvs->est_list); |
| 151 | spin_unlock_bh(&ipvs->est_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 154 | void ip_vs_kill_estimator(struct net *net, struct ip_vs_stats *stats) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 156 | struct netns_ipvs *ipvs = net_ipvs(net); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 157 | struct ip_vs_estimator *est = &stats->est; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 159 | spin_lock_bh(&ipvs->est_lock); |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 160 | list_del(&est->list); |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 161 | spin_unlock_bh(&ipvs->est_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
| 164 | void ip_vs_zero_estimator(struct ip_vs_stats *stats) |
| 165 | { |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 166 | struct ip_vs_estimator *est = &stats->est; |
Julian Anastasov | 55a3d4e | 2011-03-14 01:37:49 +0200 | [diff] [blame] | 167 | struct ip_vs_stats_user *u = &stats->ustats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Julian Anastasov | 55a3d4e | 2011-03-14 01:37:49 +0200 | [diff] [blame] | 169 | /* reset counters, caller must hold the stats->lock lock */ |
| 170 | est->last_inbytes = u->inbytes; |
| 171 | est->last_outbytes = u->outbytes; |
| 172 | est->last_conns = u->conns; |
| 173 | est->last_inpkts = u->inpkts; |
| 174 | est->last_outpkts = u->outpkts; |
Sven Wegener | 3a14a313 | 2008-08-10 18:24:41 +0000 | [diff] [blame] | 175 | est->cps = 0; |
| 176 | est->inpps = 0; |
| 177 | est->outpps = 0; |
| 178 | est->inbps = 0; |
| 179 | est->outbps = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 181 | |
Julian Anastasov | ea9f22c | 2011-03-14 01:41:54 +0200 | [diff] [blame^] | 182 | /* Get decoded rates */ |
| 183 | void ip_vs_read_estimator(struct ip_vs_stats_user *dst, |
| 184 | struct ip_vs_stats *stats) |
| 185 | { |
| 186 | struct ip_vs_estimator *e = &stats->est; |
| 187 | |
| 188 | dst->cps = (e->cps + 0x1FF) >> 10; |
| 189 | dst->inpps = (e->inpps + 0x1FF) >> 10; |
| 190 | dst->outpps = (e->outpps + 0x1FF) >> 10; |
| 191 | dst->inbps = (e->inbps + 0xF) >> 5; |
| 192 | dst->outbps = (e->outbps + 0xF) >> 5; |
| 193 | } |
| 194 | |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 195 | static int __net_init __ip_vs_estimator_init(struct net *net) |
| 196 | { |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 197 | struct netns_ipvs *ipvs = net_ipvs(net); |
| 198 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 199 | INIT_LIST_HEAD(&ipvs->est_list); |
| 200 | spin_lock_init(&ipvs->est_lock); |
| 201 | setup_timer(&ipvs->est_timer, estimation_timer, (unsigned long)net); |
| 202 | mod_timer(&ipvs->est_timer, jiffies + 2 * HZ); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 203 | return 0; |
| 204 | } |
| 205 | |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 206 | static void __net_exit __ip_vs_estimator_exit(struct net *net) |
| 207 | { |
| 208 | del_timer_sync(&net_ipvs(net)->est_timer); |
| 209 | } |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 210 | static struct pernet_operations ip_vs_app_ops = { |
| 211 | .init = __ip_vs_estimator_init, |
Hans Schillstrom | 29c2026 | 2011-01-03 14:44:54 +0100 | [diff] [blame] | 212 | .exit = __ip_vs_estimator_exit, |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 213 | }; |
| 214 | |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 215 | int __init ip_vs_estimator_init(void) |
| 216 | { |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 217 | int rv; |
| 218 | |
| 219 | rv = register_pernet_subsys(&ip_vs_app_ops); |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 220 | return rv; |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | void ip_vs_estimator_cleanup(void) |
| 224 | { |
Hans Schillstrom | 61b1ab4 | 2011-01-03 14:44:42 +0100 | [diff] [blame] | 225 | unregister_pernet_subsys(&ip_vs_app_ops); |
Sven Wegener | a919cf4 | 2008-08-14 00:47:16 +0200 | [diff] [blame] | 226 | } |