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1da177e4 LT |
1 | /* |
2 | * IPVS: Locality-Based Least-Connection scheduling module | |
3 | * | |
4 | * Version: $Id: ip_vs_lblc.c,v 1.10 2002/09/15 08:14:08 wensong Exp $ | |
5 | * | |
6 | * Authors: Wensong Zhang <wensong@gnuchina.org> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | * | |
13 | * Changes: | |
14 | * Martin Hamilton : fixed the terrible locking bugs | |
15 | * *lock(tbl->lock) ==> *lock(&tbl->lock) | |
16 | * Wensong Zhang : fixed the uninitilized tbl->lock bug | |
17 | * Wensong Zhang : added doing full expiration check to | |
18 | * collect stale entries of 24+ hours when | |
19 | * no partial expire check in a half hour | |
20 | * Julian Anastasov : replaced del_timer call with del_timer_sync | |
21 | * to avoid the possible race between timer | |
22 | * handler and del_timer thread in SMP | |
23 | * | |
24 | */ | |
25 | ||
26 | /* | |
27 | * The lblc algorithm is as follows (pseudo code): | |
28 | * | |
29 | * if cachenode[dest_ip] is null then | |
30 | * n, cachenode[dest_ip] <- {weighted least-conn node}; | |
31 | * else | |
32 | * n <- cachenode[dest_ip]; | |
33 | * if (n is dead) OR | |
34 | * (n.conns>n.weight AND | |
35 | * there is a node m with m.conns<m.weight/2) then | |
36 | * n, cachenode[dest_ip] <- {weighted least-conn node}; | |
37 | * | |
38 | * return n; | |
39 | * | |
40 | * Thanks must go to Wenzhuo Zhang for talking WCCP to me and pushing | |
41 | * me to write this module. | |
42 | */ | |
43 | ||
14c85021 | 44 | #include <linux/ip.h> |
1da177e4 LT |
45 | #include <linux/module.h> |
46 | #include <linux/kernel.h> | |
14c85021 | 47 | #include <linux/skbuff.h> |
d7fe0f24 | 48 | #include <linux/jiffies.h> |
1da177e4 LT |
49 | |
50 | /* for sysctl */ | |
51 | #include <linux/fs.h> | |
52 | #include <linux/sysctl.h> | |
53 | ||
54 | #include <net/ip_vs.h> | |
55 | ||
56 | ||
57 | /* | |
58 | * It is for garbage collection of stale IPVS lblc entries, | |
59 | * when the table is full. | |
60 | */ | |
61 | #define CHECK_EXPIRE_INTERVAL (60*HZ) | |
62 | #define ENTRY_TIMEOUT (6*60*HZ) | |
63 | ||
64 | /* | |
65 | * It is for full expiration check. | |
66 | * When there is no partial expiration check (garbage collection) | |
67 | * in a half hour, do a full expiration check to collect stale | |
68 | * entries that haven't been touched for a day. | |
69 | */ | |
70 | #define COUNT_FOR_FULL_EXPIRATION 30 | |
71 | static int sysctl_ip_vs_lblc_expiration = 24*60*60*HZ; | |
72 | ||
73 | ||
74 | /* | |
75 | * for IPVS lblc entry hash table | |
76 | */ | |
77 | #ifndef CONFIG_IP_VS_LBLC_TAB_BITS | |
78 | #define CONFIG_IP_VS_LBLC_TAB_BITS 10 | |
79 | #endif | |
80 | #define IP_VS_LBLC_TAB_BITS CONFIG_IP_VS_LBLC_TAB_BITS | |
81 | #define IP_VS_LBLC_TAB_SIZE (1 << IP_VS_LBLC_TAB_BITS) | |
82 | #define IP_VS_LBLC_TAB_MASK (IP_VS_LBLC_TAB_SIZE - 1) | |
83 | ||
84 | ||
85 | /* | |
86 | * IPVS lblc entry represents an association between destination | |
87 | * IP address and its destination server | |
88 | */ | |
89 | struct ip_vs_lblc_entry { | |
90 | struct list_head list; | |
014d730d | 91 | __be32 addr; /* destination IP address */ |
1da177e4 LT |
92 | struct ip_vs_dest *dest; /* real server (cache) */ |
93 | unsigned long lastuse; /* last used time */ | |
94 | }; | |
95 | ||
96 | ||
97 | /* | |
98 | * IPVS lblc hash table | |
99 | */ | |
100 | struct ip_vs_lblc_table { | |
101 | rwlock_t lock; /* lock for this table */ | |
102 | struct list_head bucket[IP_VS_LBLC_TAB_SIZE]; /* hash bucket */ | |
103 | atomic_t entries; /* number of entries */ | |
104 | int max_size; /* maximum size of entries */ | |
105 | struct timer_list periodic_timer; /* collect stale entries */ | |
106 | int rover; /* rover for expire check */ | |
107 | int counter; /* counter for no expire */ | |
108 | }; | |
109 | ||
110 | ||
111 | /* | |
112 | * IPVS LBLC sysctl table | |
113 | */ | |
114 | ||
115 | static ctl_table vs_vars_table[] = { | |
116 | { | |
117 | .ctl_name = NET_IPV4_VS_LBLC_EXPIRE, | |
118 | .procname = "lblc_expiration", | |
119 | .data = &sysctl_ip_vs_lblc_expiration, | |
120 | .maxlen = sizeof(int), | |
e905a9ed | 121 | .mode = 0644, |
1da177e4 LT |
122 | .proc_handler = &proc_dointvec_jiffies, |
123 | }, | |
124 | { .ctl_name = 0 } | |
125 | }; | |
126 | ||
127 | static ctl_table vs_table[] = { | |
128 | { | |
129 | .ctl_name = NET_IPV4_VS, | |
130 | .procname = "vs", | |
e905a9ed | 131 | .mode = 0555, |
1da177e4 LT |
132 | .child = vs_vars_table |
133 | }, | |
134 | { .ctl_name = 0 } | |
135 | }; | |
136 | ||
bf0ff9e5 | 137 | static ctl_table ipvs_ipv4_table[] = { |
1da177e4 LT |
138 | { |
139 | .ctl_name = NET_IPV4, | |
e905a9ed | 140 | .procname = "ipv4", |
1da177e4 LT |
141 | .mode = 0555, |
142 | .child = vs_table | |
143 | }, | |
144 | { .ctl_name = 0 } | |
145 | }; | |
146 | ||
147 | static ctl_table lblc_root_table[] = { | |
148 | { | |
149 | .ctl_name = CTL_NET, | |
e905a9ed YH |
150 | .procname = "net", |
151 | .mode = 0555, | |
bf0ff9e5 | 152 | .child = ipvs_ipv4_table |
1da177e4 LT |
153 | }, |
154 | { .ctl_name = 0 } | |
155 | }; | |
156 | ||
157 | static struct ctl_table_header * sysctl_header; | |
158 | ||
159 | /* | |
160 | * new/free a ip_vs_lblc_entry, which is a mapping of a destionation | |
161 | * IP address to a server. | |
162 | */ | |
163 | static inline struct ip_vs_lblc_entry * | |
014d730d | 164 | ip_vs_lblc_new(__be32 daddr, struct ip_vs_dest *dest) |
1da177e4 LT |
165 | { |
166 | struct ip_vs_lblc_entry *en; | |
167 | ||
168 | en = kmalloc(sizeof(struct ip_vs_lblc_entry), GFP_ATOMIC); | |
169 | if (en == NULL) { | |
170 | IP_VS_ERR("ip_vs_lblc_new(): no memory\n"); | |
171 | return NULL; | |
172 | } | |
173 | ||
174 | INIT_LIST_HEAD(&en->list); | |
175 | en->addr = daddr; | |
176 | ||
177 | atomic_inc(&dest->refcnt); | |
178 | en->dest = dest; | |
179 | ||
180 | return en; | |
181 | } | |
182 | ||
183 | ||
184 | static inline void ip_vs_lblc_free(struct ip_vs_lblc_entry *en) | |
185 | { | |
186 | list_del(&en->list); | |
187 | /* | |
188 | * We don't kfree dest because it is refered either by its service | |
189 | * or the trash dest list. | |
190 | */ | |
191 | atomic_dec(&en->dest->refcnt); | |
192 | kfree(en); | |
193 | } | |
194 | ||
195 | ||
196 | /* | |
197 | * Returns hash value for IPVS LBLC entry | |
198 | */ | |
014d730d | 199 | static inline unsigned ip_vs_lblc_hashkey(__be32 addr) |
1da177e4 LT |
200 | { |
201 | return (ntohl(addr)*2654435761UL) & IP_VS_LBLC_TAB_MASK; | |
202 | } | |
203 | ||
204 | ||
205 | /* | |
206 | * Hash an entry in the ip_vs_lblc_table. | |
207 | * returns bool success. | |
208 | */ | |
209 | static int | |
210 | ip_vs_lblc_hash(struct ip_vs_lblc_table *tbl, struct ip_vs_lblc_entry *en) | |
211 | { | |
212 | unsigned hash; | |
213 | ||
214 | if (!list_empty(&en->list)) { | |
215 | IP_VS_ERR("ip_vs_lblc_hash(): request for already hashed, " | |
216 | "called from %p\n", __builtin_return_address(0)); | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Hash by destination IP address | |
222 | */ | |
223 | hash = ip_vs_lblc_hashkey(en->addr); | |
224 | ||
225 | write_lock(&tbl->lock); | |
226 | list_add(&en->list, &tbl->bucket[hash]); | |
227 | atomic_inc(&tbl->entries); | |
228 | write_unlock(&tbl->lock); | |
229 | ||
230 | return 1; | |
231 | } | |
232 | ||
233 | ||
1da177e4 LT |
234 | /* |
235 | * Get ip_vs_lblc_entry associated with supplied parameters. | |
236 | */ | |
237 | static inline struct ip_vs_lblc_entry * | |
014d730d | 238 | ip_vs_lblc_get(struct ip_vs_lblc_table *tbl, __be32 addr) |
1da177e4 LT |
239 | { |
240 | unsigned hash; | |
241 | struct ip_vs_lblc_entry *en; | |
242 | ||
243 | hash = ip_vs_lblc_hashkey(addr); | |
244 | ||
245 | read_lock(&tbl->lock); | |
246 | ||
247 | list_for_each_entry(en, &tbl->bucket[hash], list) { | |
248 | if (en->addr == addr) { | |
249 | /* HIT */ | |
250 | read_unlock(&tbl->lock); | |
251 | return en; | |
252 | } | |
253 | } | |
254 | ||
255 | read_unlock(&tbl->lock); | |
256 | ||
257 | return NULL; | |
258 | } | |
259 | ||
260 | ||
261 | /* | |
262 | * Flush all the entries of the specified table. | |
263 | */ | |
264 | static void ip_vs_lblc_flush(struct ip_vs_lblc_table *tbl) | |
265 | { | |
266 | int i; | |
267 | struct ip_vs_lblc_entry *en, *nxt; | |
268 | ||
269 | for (i=0; i<IP_VS_LBLC_TAB_SIZE; i++) { | |
270 | write_lock(&tbl->lock); | |
271 | list_for_each_entry_safe(en, nxt, &tbl->bucket[i], list) { | |
272 | ip_vs_lblc_free(en); | |
273 | atomic_dec(&tbl->entries); | |
274 | } | |
275 | write_unlock(&tbl->lock); | |
276 | } | |
277 | } | |
278 | ||
279 | ||
280 | static inline void ip_vs_lblc_full_check(struct ip_vs_lblc_table *tbl) | |
281 | { | |
282 | unsigned long now = jiffies; | |
283 | int i, j; | |
284 | struct ip_vs_lblc_entry *en, *nxt; | |
285 | ||
286 | for (i=0, j=tbl->rover; i<IP_VS_LBLC_TAB_SIZE; i++) { | |
287 | j = (j + 1) & IP_VS_LBLC_TAB_MASK; | |
288 | ||
289 | write_lock(&tbl->lock); | |
290 | list_for_each_entry_safe(en, nxt, &tbl->bucket[j], list) { | |
e905a9ed | 291 | if (time_before(now, |
1da177e4 LT |
292 | en->lastuse + sysctl_ip_vs_lblc_expiration)) |
293 | continue; | |
294 | ||
295 | ip_vs_lblc_free(en); | |
296 | atomic_dec(&tbl->entries); | |
297 | } | |
298 | write_unlock(&tbl->lock); | |
299 | } | |
300 | tbl->rover = j; | |
301 | } | |
302 | ||
303 | ||
304 | /* | |
305 | * Periodical timer handler for IPVS lblc table | |
306 | * It is used to collect stale entries when the number of entries | |
307 | * exceeds the maximum size of the table. | |
308 | * | |
309 | * Fixme: we probably need more complicated algorithm to collect | |
310 | * entries that have not been used for a long time even | |
311 | * if the number of entries doesn't exceed the maximum size | |
312 | * of the table. | |
313 | * The full expiration check is for this purpose now. | |
314 | */ | |
315 | static void ip_vs_lblc_check_expire(unsigned long data) | |
316 | { | |
317 | struct ip_vs_lblc_table *tbl; | |
318 | unsigned long now = jiffies; | |
319 | int goal; | |
320 | int i, j; | |
321 | struct ip_vs_lblc_entry *en, *nxt; | |
322 | ||
323 | tbl = (struct ip_vs_lblc_table *)data; | |
324 | ||
325 | if ((tbl->counter % COUNT_FOR_FULL_EXPIRATION) == 0) { | |
326 | /* do full expiration check */ | |
327 | ip_vs_lblc_full_check(tbl); | |
328 | tbl->counter = 1; | |
329 | goto out; | |
330 | } | |
331 | ||
332 | if (atomic_read(&tbl->entries) <= tbl->max_size) { | |
333 | tbl->counter++; | |
334 | goto out; | |
335 | } | |
336 | ||
337 | goal = (atomic_read(&tbl->entries) - tbl->max_size)*4/3; | |
338 | if (goal > tbl->max_size/2) | |
339 | goal = tbl->max_size/2; | |
340 | ||
341 | for (i=0, j=tbl->rover; i<IP_VS_LBLC_TAB_SIZE; i++) { | |
342 | j = (j + 1) & IP_VS_LBLC_TAB_MASK; | |
343 | ||
344 | write_lock(&tbl->lock); | |
345 | list_for_each_entry_safe(en, nxt, &tbl->bucket[j], list) { | |
346 | if (time_before(now, en->lastuse + ENTRY_TIMEOUT)) | |
347 | continue; | |
348 | ||
349 | ip_vs_lblc_free(en); | |
350 | atomic_dec(&tbl->entries); | |
351 | goal--; | |
352 | } | |
353 | write_unlock(&tbl->lock); | |
354 | if (goal <= 0) | |
355 | break; | |
356 | } | |
357 | tbl->rover = j; | |
358 | ||
359 | out: | |
360 | mod_timer(&tbl->periodic_timer, jiffies+CHECK_EXPIRE_INTERVAL); | |
361 | } | |
362 | ||
363 | ||
364 | static int ip_vs_lblc_init_svc(struct ip_vs_service *svc) | |
365 | { | |
366 | int i; | |
367 | struct ip_vs_lblc_table *tbl; | |
368 | ||
369 | /* | |
370 | * Allocate the ip_vs_lblc_table for this service | |
371 | */ | |
372 | tbl = kmalloc(sizeof(struct ip_vs_lblc_table), GFP_ATOMIC); | |
373 | if (tbl == NULL) { | |
374 | IP_VS_ERR("ip_vs_lblc_init_svc(): no memory\n"); | |
375 | return -ENOMEM; | |
376 | } | |
377 | svc->sched_data = tbl; | |
378 | IP_VS_DBG(6, "LBLC hash table (memory=%Zdbytes) allocated for " | |
379 | "current service\n", | |
380 | sizeof(struct ip_vs_lblc_table)); | |
381 | ||
382 | /* | |
383 | * Initialize the hash buckets | |
384 | */ | |
385 | for (i=0; i<IP_VS_LBLC_TAB_SIZE; i++) { | |
386 | INIT_LIST_HEAD(&tbl->bucket[i]); | |
387 | } | |
388 | rwlock_init(&tbl->lock); | |
389 | tbl->max_size = IP_VS_LBLC_TAB_SIZE*16; | |
390 | tbl->rover = 0; | |
391 | tbl->counter = 1; | |
392 | ||
393 | /* | |
394 | * Hook periodic timer for garbage collection | |
395 | */ | |
396 | init_timer(&tbl->periodic_timer); | |
397 | tbl->periodic_timer.data = (unsigned long)tbl; | |
398 | tbl->periodic_timer.function = ip_vs_lblc_check_expire; | |
399 | tbl->periodic_timer.expires = jiffies+CHECK_EXPIRE_INTERVAL; | |
400 | add_timer(&tbl->periodic_timer); | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
405 | ||
406 | static int ip_vs_lblc_done_svc(struct ip_vs_service *svc) | |
407 | { | |
408 | struct ip_vs_lblc_table *tbl = svc->sched_data; | |
409 | ||
410 | /* remove periodic timer */ | |
411 | del_timer_sync(&tbl->periodic_timer); | |
412 | ||
413 | /* got to clean up table entries here */ | |
414 | ip_vs_lblc_flush(tbl); | |
415 | ||
416 | /* release the table itself */ | |
417 | kfree(svc->sched_data); | |
418 | IP_VS_DBG(6, "LBLC hash table (memory=%Zdbytes) released\n", | |
419 | sizeof(struct ip_vs_lblc_table)); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | ||
425 | static int ip_vs_lblc_update_svc(struct ip_vs_service *svc) | |
426 | { | |
427 | return 0; | |
428 | } | |
429 | ||
430 | ||
431 | static inline struct ip_vs_dest * | |
432 | __ip_vs_wlc_schedule(struct ip_vs_service *svc, struct iphdr *iph) | |
433 | { | |
434 | struct ip_vs_dest *dest, *least; | |
435 | int loh, doh; | |
436 | ||
437 | /* | |
438 | * We think the overhead of processing active connections is fifty | |
439 | * times higher than that of inactive connections in average. (This | |
440 | * fifty times might not be accurate, we will change it later.) We | |
441 | * use the following formula to estimate the overhead: | |
442 | * dest->activeconns*50 + dest->inactconns | |
443 | * and the load: | |
444 | * (dest overhead) / dest->weight | |
445 | * | |
446 | * Remember -- no floats in kernel mode!!! | |
447 | * The comparison of h1*w2 > h2*w1 is equivalent to that of | |
448 | * h1/w1 > h2/w2 | |
449 | * if every weight is larger than zero. | |
450 | * | |
451 | * The server with weight=0 is quiesced and will not receive any | |
452 | * new connection. | |
453 | */ | |
454 | list_for_each_entry(dest, &svc->destinations, n_list) { | |
455 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
456 | continue; | |
457 | if (atomic_read(&dest->weight) > 0) { | |
458 | least = dest; | |
459 | loh = atomic_read(&least->activeconns) * 50 | |
460 | + atomic_read(&least->inactconns); | |
461 | goto nextstage; | |
462 | } | |
463 | } | |
464 | return NULL; | |
465 | ||
466 | /* | |
467 | * Find the destination with the least load. | |
468 | */ | |
469 | nextstage: | |
470 | list_for_each_entry_continue(dest, &svc->destinations, n_list) { | |
471 | if (dest->flags & IP_VS_DEST_F_OVERLOAD) | |
472 | continue; | |
473 | ||
474 | doh = atomic_read(&dest->activeconns) * 50 | |
475 | + atomic_read(&dest->inactconns); | |
476 | if (loh * atomic_read(&dest->weight) > | |
477 | doh * atomic_read(&least->weight)) { | |
478 | least = dest; | |
479 | loh = doh; | |
480 | } | |
481 | } | |
482 | ||
483 | IP_VS_DBG(6, "LBLC: server %d.%d.%d.%d:%d " | |
484 | "activeconns %d refcnt %d weight %d overhead %d\n", | |
485 | NIPQUAD(least->addr), ntohs(least->port), | |
486 | atomic_read(&least->activeconns), | |
487 | atomic_read(&least->refcnt), | |
488 | atomic_read(&least->weight), loh); | |
489 | ||
490 | return least; | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | * If this destination server is overloaded and there is a less loaded | |
496 | * server, then return true. | |
497 | */ | |
498 | static inline int | |
499 | is_overloaded(struct ip_vs_dest *dest, struct ip_vs_service *svc) | |
500 | { | |
501 | if (atomic_read(&dest->activeconns) > atomic_read(&dest->weight)) { | |
502 | struct ip_vs_dest *d; | |
503 | ||
504 | list_for_each_entry(d, &svc->destinations, n_list) { | |
505 | if (atomic_read(&d->activeconns)*2 | |
506 | < atomic_read(&d->weight)) { | |
507 | return 1; | |
508 | } | |
509 | } | |
510 | } | |
511 | return 0; | |
512 | } | |
513 | ||
514 | ||
515 | /* | |
516 | * Locality-Based (weighted) Least-Connection scheduling | |
517 | */ | |
518 | static struct ip_vs_dest * | |
519 | ip_vs_lblc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb) | |
520 | { | |
521 | struct ip_vs_dest *dest; | |
522 | struct ip_vs_lblc_table *tbl; | |
523 | struct ip_vs_lblc_entry *en; | |
eddc9ec5 | 524 | struct iphdr *iph = ip_hdr(skb); |
1da177e4 LT |
525 | |
526 | IP_VS_DBG(6, "ip_vs_lblc_schedule(): Scheduling...\n"); | |
527 | ||
528 | tbl = (struct ip_vs_lblc_table *)svc->sched_data; | |
529 | en = ip_vs_lblc_get(tbl, iph->daddr); | |
530 | if (en == NULL) { | |
531 | dest = __ip_vs_wlc_schedule(svc, iph); | |
532 | if (dest == NULL) { | |
533 | IP_VS_DBG(1, "no destination available\n"); | |
534 | return NULL; | |
535 | } | |
536 | en = ip_vs_lblc_new(iph->daddr, dest); | |
537 | if (en == NULL) { | |
538 | return NULL; | |
539 | } | |
540 | ip_vs_lblc_hash(tbl, en); | |
541 | } else { | |
542 | dest = en->dest; | |
543 | if (!(dest->flags & IP_VS_DEST_F_AVAILABLE) | |
544 | || atomic_read(&dest->weight) <= 0 | |
545 | || is_overloaded(dest, svc)) { | |
546 | dest = __ip_vs_wlc_schedule(svc, iph); | |
547 | if (dest == NULL) { | |
548 | IP_VS_DBG(1, "no destination available\n"); | |
549 | return NULL; | |
550 | } | |
551 | atomic_dec(&en->dest->refcnt); | |
552 | atomic_inc(&dest->refcnt); | |
553 | en->dest = dest; | |
554 | } | |
555 | } | |
556 | en->lastuse = jiffies; | |
557 | ||
558 | IP_VS_DBG(6, "LBLC: destination IP address %u.%u.%u.%u " | |
559 | "--> server %u.%u.%u.%u:%d\n", | |
560 | NIPQUAD(en->addr), | |
561 | NIPQUAD(dest->addr), | |
562 | ntohs(dest->port)); | |
563 | ||
564 | return dest; | |
565 | } | |
566 | ||
567 | ||
568 | /* | |
569 | * IPVS LBLC Scheduler structure | |
570 | */ | |
571 | static struct ip_vs_scheduler ip_vs_lblc_scheduler = | |
572 | { | |
573 | .name = "lblc", | |
574 | .refcnt = ATOMIC_INIT(0), | |
575 | .module = THIS_MODULE, | |
576 | .init_service = ip_vs_lblc_init_svc, | |
577 | .done_service = ip_vs_lblc_done_svc, | |
578 | .update_service = ip_vs_lblc_update_svc, | |
579 | .schedule = ip_vs_lblc_schedule, | |
580 | }; | |
581 | ||
582 | ||
583 | static int __init ip_vs_lblc_init(void) | |
584 | { | |
585 | INIT_LIST_HEAD(&ip_vs_lblc_scheduler.n_list); | |
0b4d4147 | 586 | sysctl_header = register_sysctl_table(lblc_root_table); |
1da177e4 LT |
587 | return register_ip_vs_scheduler(&ip_vs_lblc_scheduler); |
588 | } | |
589 | ||
590 | ||
591 | static void __exit ip_vs_lblc_cleanup(void) | |
592 | { | |
593 | unregister_sysctl_table(sysctl_header); | |
594 | unregister_ip_vs_scheduler(&ip_vs_lblc_scheduler); | |
595 | } | |
596 | ||
597 | ||
598 | module_init(ip_vs_lblc_init); | |
599 | module_exit(ip_vs_lblc_cleanup); | |
600 | MODULE_LICENSE("GPL"); |