Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/gen_estimator.c Simple rate estimator. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * Changes: |
| 12 | * Jamal Hadi Salim - moved it to net/core and reshulfed |
| 13 | * names to make it usable in general net subsystem. |
| 14 | */ |
| 15 | |
| 16 | #include <asm/uaccess.h> |
| 17 | #include <asm/system.h> |
Jiri Slaby | 1977f03 | 2007-10-18 23:40:25 -0700 | [diff] [blame] | 18 | #include <linux/bitops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/jiffies.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/socket.h> |
| 26 | #include <linux/sockios.h> |
| 27 | #include <linux/in.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/interrupt.h> |
| 30 | #include <linux/netdevice.h> |
| 31 | #include <linux/skbuff.h> |
| 32 | #include <linux/rtnetlink.h> |
| 33 | #include <linux/init.h> |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 34 | #include <linux/rbtree.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 35 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <net/sock.h> |
| 37 | #include <net/gen_stats.h> |
| 38 | |
| 39 | /* |
| 40 | This code is NOT intended to be used for statistics collection, |
| 41 | its purpose is to provide a base for statistical multiplexing |
| 42 | for controlled load service. |
| 43 | If you need only statistics, run a user level daemon which |
| 44 | periodically reads byte counters. |
| 45 | |
| 46 | Unfortunately, rate estimation is not a very easy task. |
| 47 | F.e. I did not find a simple way to estimate the current peak rate |
| 48 | and even failed to formulate the problem 8)8) |
| 49 | |
| 50 | So I preferred not to built an estimator into the scheduler, |
| 51 | but run this task separately. |
| 52 | Ideally, it should be kernel thread(s), but for now it runs |
| 53 | from timers, which puts apparent top bounds on the number of rated |
| 54 | flows, has minimal overhead on small, but is enough |
| 55 | to handle controlled load service, sets of aggregates. |
| 56 | |
| 57 | We measure rate over A=(1<<interval) seconds and evaluate EWMA: |
| 58 | |
| 59 | avrate = avrate*(1-W) + rate*W |
| 60 | |
| 61 | where W is chosen as negative power of 2: W = 2^(-ewma_log) |
| 62 | |
| 63 | The resulting time constant is: |
| 64 | |
| 65 | T = A/(-ln(1-W)) |
| 66 | |
| 67 | |
| 68 | NOTES. |
| 69 | |
Eric Dumazet | 511e11e | 2009-05-18 19:26:37 -0700 | [diff] [blame] | 70 | * avbps is scaled by 2^5, avpps is scaled by 2^10. |
| 71 | * both values are reported as 32 bit unsigned values. bps can |
| 72 | overflow for fast links : max speed being 34360Mbit/sec |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | * Minimal interval is HZ/4=250msec (it is the greatest common divisor |
| 74 | for HZ=100 and HZ=1024 8)), maximal interval |
| 75 | is (HZ*2^EST_MAX_INTERVAL)/4 = 8sec. Shorter intervals |
| 76 | are too expensive, longer ones can be implemented |
| 77 | at user level painlessly. |
| 78 | */ |
| 79 | |
| 80 | #define EST_MAX_INTERVAL 5 |
| 81 | |
| 82 | struct gen_estimator |
| 83 | { |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 84 | struct list_head list; |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 85 | struct gnet_stats_basic_packed *bstats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | struct gnet_stats_rate_est *rate_est; |
| 87 | spinlock_t *stats_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | int ewma_log; |
| 89 | u64 last_bytes; |
Eric Dumazet | 511e11e | 2009-05-18 19:26:37 -0700 | [diff] [blame] | 90 | u64 avbps; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | u32 last_packets; |
| 92 | u32 avpps; |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 93 | struct rcu_head e_rcu; |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 94 | struct rb_node node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | }; |
| 96 | |
| 97 | struct gen_estimator_head |
| 98 | { |
| 99 | struct timer_list timer; |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 100 | struct list_head list; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | }; |
| 102 | |
| 103 | static struct gen_estimator_head elist[EST_MAX_INTERVAL+1]; |
| 104 | |
David S. Miller | deb3abf | 2008-08-18 22:32:10 -0700 | [diff] [blame] | 105 | /* Protects against NULL dereference */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static DEFINE_RWLOCK(est_lock); |
| 107 | |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 108 | /* Protects against soft lockup during large deletion */ |
| 109 | static struct rb_root est_root = RB_ROOT; |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 110 | static DEFINE_SPINLOCK(est_tree_lock); |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | static void est_timer(unsigned long arg) |
| 113 | { |
| 114 | int idx = (int)arg; |
| 115 | struct gen_estimator *e; |
| 116 | |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 117 | rcu_read_lock(); |
| 118 | list_for_each_entry_rcu(e, &elist[idx].list, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | u64 nbytes; |
Eric Dumazet | 511e11e | 2009-05-18 19:26:37 -0700 | [diff] [blame] | 120 | u64 brate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | u32 npackets; |
| 122 | u32 rate; |
| 123 | |
| 124 | spin_lock(e->stats_lock); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 125 | read_lock(&est_lock); |
| 126 | if (e->bstats == NULL) |
| 127 | goto skip; |
| 128 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | nbytes = e->bstats->bytes; |
| 130 | npackets = e->bstats->packets; |
Eric Dumazet | 511e11e | 2009-05-18 19:26:37 -0700 | [diff] [blame] | 131 | brate = (nbytes - e->last_bytes)<<(7 - idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | e->last_bytes = nbytes; |
Jarek Poplawski | a1dcb66 | 2009-05-25 22:47:01 -0700 | [diff] [blame] | 133 | e->avbps += (brate >> e->ewma_log) - (e->avbps >> e->ewma_log); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | e->rate_est->bps = (e->avbps+0xF)>>5; |
| 135 | |
| 136 | rate = (npackets - e->last_packets)<<(12 - idx); |
| 137 | e->last_packets = npackets; |
Jarek Poplawski | a1dcb66 | 2009-05-25 22:47:01 -0700 | [diff] [blame] | 138 | e->avpps += (rate >> e->ewma_log) - (e->avpps >> e->ewma_log); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | e->rate_est->pps = (e->avpps+0x1FF)>>10; |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 140 | skip: |
| 141 | read_unlock(&est_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | spin_unlock(e->stats_lock); |
| 143 | } |
| 144 | |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 145 | if (!list_empty(&elist[idx].list)) |
Eric Dumazet | 789675e | 2008-01-03 20:40:01 -0800 | [diff] [blame] | 146 | mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx)); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 147 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | } |
| 149 | |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 150 | static void gen_add_node(struct gen_estimator *est) |
| 151 | { |
| 152 | struct rb_node **p = &est_root.rb_node, *parent = NULL; |
| 153 | |
| 154 | while (*p) { |
| 155 | struct gen_estimator *e; |
| 156 | |
| 157 | parent = *p; |
| 158 | e = rb_entry(parent, struct gen_estimator, node); |
| 159 | |
| 160 | if (est->bstats > e->bstats) |
| 161 | p = &parent->rb_right; |
| 162 | else |
| 163 | p = &parent->rb_left; |
| 164 | } |
| 165 | rb_link_node(&est->node, parent, p); |
| 166 | rb_insert_color(&est->node, &est_root); |
| 167 | } |
| 168 | |
Jarek Poplawski | 244e6c2 | 2008-11-26 15:24:32 -0800 | [diff] [blame] | 169 | static |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 170 | struct gen_estimator *gen_find_node(const struct gnet_stats_basic_packed *bstats, |
Jarek Poplawski | 244e6c2 | 2008-11-26 15:24:32 -0800 | [diff] [blame] | 171 | const struct gnet_stats_rate_est *rate_est) |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 172 | { |
| 173 | struct rb_node *p = est_root.rb_node; |
| 174 | |
| 175 | while (p) { |
| 176 | struct gen_estimator *e; |
| 177 | |
| 178 | e = rb_entry(p, struct gen_estimator, node); |
| 179 | |
| 180 | if (bstats > e->bstats) |
| 181 | p = p->rb_right; |
| 182 | else if (bstats < e->bstats || rate_est != e->rate_est) |
| 183 | p = p->rb_left; |
| 184 | else |
| 185 | return e; |
| 186 | } |
| 187 | return NULL; |
| 188 | } |
| 189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | /** |
| 191 | * gen_new_estimator - create a new rate estimator |
| 192 | * @bstats: basic statistics |
| 193 | * @rate_est: rate estimator statistics |
| 194 | * @stats_lock: statistics lock |
| 195 | * @opt: rate estimator configuration TLV |
| 196 | * |
| 197 | * Creates a new rate estimator with &bstats as source and &rate_est |
| 198 | * as destination. A new timer with the interval specified in the |
| 199 | * configuration TLV is created. Upon each interval, the latest statistics |
| 200 | * will be read from &bstats and the estimated rate will be stored in |
| 201 | * &rate_est with the statistics lock grabed during this period. |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 202 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | * Returns 0 on success or a negative error code. |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 204 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | */ |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 206 | int gen_new_estimator(struct gnet_stats_basic_packed *bstats, |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 207 | struct gnet_stats_rate_est *rate_est, |
| 208 | spinlock_t *stats_lock, |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 209 | struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
| 211 | struct gen_estimator *est; |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 212 | struct gnet_estimator *parm = nla_data(opt); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 213 | int idx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 215 | if (nla_len(opt) < sizeof(*parm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | return -EINVAL; |
| 217 | |
| 218 | if (parm->interval < -2 || parm->interval > 3) |
| 219 | return -EINVAL; |
| 220 | |
Andrew Morton | 77d04bd | 2006-04-07 14:52:59 -0700 | [diff] [blame] | 221 | est = kzalloc(sizeof(*est), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | if (est == NULL) |
| 223 | return -ENOBUFS; |
| 224 | |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 225 | idx = parm->interval + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | est->bstats = bstats; |
| 227 | est->rate_est = rate_est; |
| 228 | est->stats_lock = stats_lock; |
| 229 | est->ewma_log = parm->ewma_log; |
| 230 | est->last_bytes = bstats->bytes; |
| 231 | est->avbps = rate_est->bps<<5; |
| 232 | est->last_packets = bstats->packets; |
| 233 | est->avpps = rate_est->pps<<10; |
| 234 | |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 235 | spin_lock(&est_tree_lock); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 236 | if (!elist[idx].timer.function) { |
| 237 | INIT_LIST_HEAD(&elist[idx].list); |
| 238 | setup_timer(&elist[idx].timer, est_timer, idx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 240 | |
| 241 | if (list_empty(&elist[idx].list)) |
Eric Dumazet | 789675e | 2008-01-03 20:40:01 -0800 | [diff] [blame] | 242 | mod_timer(&elist[idx].timer, jiffies + ((HZ/4) << idx)); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 243 | |
| 244 | list_add_rcu(&est->list, &elist[idx].list); |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 245 | gen_add_node(est); |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 246 | spin_unlock(&est_tree_lock); |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | return 0; |
| 249 | } |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 250 | EXPORT_SYMBOL(gen_new_estimator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 252 | static void __gen_kill_estimator(struct rcu_head *head) |
| 253 | { |
| 254 | struct gen_estimator *e = container_of(head, |
| 255 | struct gen_estimator, e_rcu); |
| 256 | kfree(e); |
| 257 | } |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | /** |
| 260 | * gen_kill_estimator - remove a rate estimator |
| 261 | * @bstats: basic statistics |
| 262 | * @rate_est: rate estimator statistics |
| 263 | * |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 264 | * Removes the rate estimator specified by &bstats and &rate_est. |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 265 | * |
Eric Dumazet | c7de2cf | 2010-06-09 02:09:23 +0000 | [diff] [blame] | 266 | * Note : Caller should respect an RCU grace period before freeing stats_lock |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | */ |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 268 | void gen_kill_estimator(struct gnet_stats_basic_packed *bstats, |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 269 | struct gnet_stats_rate_est *rate_est) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 271 | struct gen_estimator *e; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 273 | spin_lock(&est_tree_lock); |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 274 | while ((e = gen_find_node(bstats, rate_est))) { |
| 275 | rb_erase(&e->node, &est_root); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 276 | |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 277 | write_lock_bh(&est_lock); |
| 278 | e->bstats = NULL; |
| 279 | write_unlock_bh(&est_lock); |
Ranko Zivojnovic | 0929c2d | 2007-07-16 18:28:32 -0700 | [diff] [blame] | 280 | |
Jarek Poplawski | 4db0acf | 2008-11-24 15:48:05 -0800 | [diff] [blame] | 281 | list_del_rcu(&e->list); |
| 282 | call_rcu(&e->e_rcu, __gen_kill_estimator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | } |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 284 | spin_unlock(&est_tree_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | } |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 286 | EXPORT_SYMBOL(gen_kill_estimator); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | |
| 288 | /** |
Jarek Poplawski | 9675016 | 2008-01-21 02:36:02 -0800 | [diff] [blame] | 289 | * gen_replace_estimator - replace rate estimator configuration |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | * @bstats: basic statistics |
| 291 | * @rate_est: rate estimator statistics |
| 292 | * @stats_lock: statistics lock |
| 293 | * @opt: rate estimator configuration TLV |
| 294 | * |
| 295 | * Replaces the configuration of a rate estimator by calling |
| 296 | * gen_kill_estimator() and gen_new_estimator(). |
YOSHIFUJI Hideaki | 4ec93ed | 2007-02-09 23:24:36 +0900 | [diff] [blame] | 297 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | * Returns 0 on success or a negative error code. |
| 299 | */ |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 300 | int gen_replace_estimator(struct gnet_stats_basic_packed *bstats, |
Jarek Poplawski | 9675016 | 2008-01-21 02:36:02 -0800 | [diff] [blame] | 301 | struct gnet_stats_rate_est *rate_est, |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 302 | spinlock_t *stats_lock, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
Jarek Poplawski | 9675016 | 2008-01-21 02:36:02 -0800 | [diff] [blame] | 304 | gen_kill_estimator(bstats, rate_est); |
| 305 | return gen_new_estimator(bstats, rate_est, stats_lock, opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | EXPORT_SYMBOL(gen_replace_estimator); |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 308 | |
| 309 | /** |
| 310 | * gen_estimator_active - test if estimator is currently in use |
Jarek Poplawski | 244e6c2 | 2008-11-26 15:24:32 -0800 | [diff] [blame] | 311 | * @bstats: basic statistics |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 312 | * @rate_est: rate estimator statistics |
| 313 | * |
Jarek Poplawski | 244e6c2 | 2008-11-26 15:24:32 -0800 | [diff] [blame] | 314 | * Returns true if estimator is active, and false if not. |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 315 | */ |
Eric Dumazet | c1a8f1f | 2009-08-16 09:36:49 +0000 | [diff] [blame] | 316 | bool gen_estimator_active(const struct gnet_stats_basic_packed *bstats, |
Jarek Poplawski | 244e6c2 | 2008-11-26 15:24:32 -0800 | [diff] [blame] | 317 | const struct gnet_stats_rate_est *rate_est) |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 318 | { |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 319 | bool res; |
| 320 | |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 321 | ASSERT_RTNL(); |
| 322 | |
Eric Dumazet | ae638c4 | 2010-06-08 23:39:10 +0000 | [diff] [blame] | 323 | spin_lock(&est_tree_lock); |
| 324 | res = gen_find_node(bstats, rate_est) != NULL; |
| 325 | spin_unlock(&est_tree_lock); |
| 326 | |
| 327 | return res; |
Stephen Hemminger | c1b5687 | 2008-11-25 21:14:06 -0800 | [diff] [blame] | 328 | } |
| 329 | EXPORT_SYMBOL(gen_estimator_active); |