diff options
Diffstat (limited to 'net/ipv4/ipvs/ip_vs_wlc.c')
| -rw-r--r-- | net/ipv4/ipvs/ip_vs_wlc.c | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/net/ipv4/ipvs/ip_vs_wlc.c b/net/ipv4/ipvs/ip_vs_wlc.c deleted file mode 100644 index 9b0ef86bb1f..00000000000 --- a/net/ipv4/ipvs/ip_vs_wlc.c +++ /dev/null @@ -1,149 +0,0 @@ -/* - * IPVS: Weighted Least-Connection Scheduling module - * - * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> - * Peter Kese <peter.kese@ijs.si> - * - * 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: - * Wensong Zhang : changed the ip_vs_wlc_schedule to return dest - * Wensong Zhang : changed to use the inactconns in scheduling - * Wensong Zhang : changed some comestics things for debugging - * Wensong Zhang : changed for the d-linked destination list - * Wensong Zhang : added the ip_vs_wlc_update_svc - * Wensong Zhang : added any dest with weight=0 is quiesced - * - */ - -#include <linux/module.h> -#include <linux/kernel.h> - -#include <net/ip_vs.h> - - -static int -ip_vs_wlc_init_svc(struct ip_vs_service *svc) -{ - return 0; -} - - -static int -ip_vs_wlc_done_svc(struct ip_vs_service *svc) -{ - return 0; -} - - -static int -ip_vs_wlc_update_svc(struct ip_vs_service *svc) -{ - return 0; -} - - -static inline unsigned int -ip_vs_wlc_dest_overhead(struct ip_vs_dest *dest) -{ - /* - * We think the overhead of processing active connections is 256 - * times higher than that of inactive connections in average. (This - * 256 times might not be accurate, we will change it later) We - * use the following formula to estimate the overhead now: - * dest->activeconns*256 + dest->inactconns - */ - return (atomic_read(&dest->activeconns) << 8) + - atomic_read(&dest->inactconns); -} - - -/* - * Weighted Least Connection scheduling - */ -static struct ip_vs_dest * -ip_vs_wlc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb) -{ - struct ip_vs_dest *dest, *least; - unsigned int loh, doh; - - IP_VS_DBG(6, "ip_vs_wlc_schedule(): Scheduling...\n"); - - /* - * We calculate the load of each dest server as follows: - * (dest overhead) / dest->weight - * - * Remember -- no floats in kernel mode!!! - * The comparison of h1*w2 > h2*w1 is equivalent to that of - * h1/w1 > h2/w2 - * if every weight is larger than zero. - * - * The server with weight=0 is quiesced and will not receive any - * new connections. - */ - - list_for_each_entry(dest, &svc->destinations, n_list) { - if (!(dest->flags & IP_VS_DEST_F_OVERLOAD) && - atomic_read(&dest->weight) > 0) { - least = dest; - loh = ip_vs_wlc_dest_overhead(least); - goto nextstage; - } - } - return NULL; - - /* - * Find the destination with the least load. - */ - nextstage: - list_for_each_entry_continue(dest, &svc->destinations, n_list) { - if (dest->flags & IP_VS_DEST_F_OVERLOAD) - continue; - doh = ip_vs_wlc_dest_overhead(dest); - if (loh * atomic_read(&dest->weight) > - doh * atomic_read(&least->weight)) { - least = dest; - loh = doh; - } - } - - IP_VS_DBG(6, "WLC: server %u.%u.%u.%u:%u " - "activeconns %d refcnt %d weight %d overhead %d\n", - NIPQUAD(least->addr), ntohs(least->port), - atomic_read(&least->activeconns), - atomic_read(&least->refcnt), - atomic_read(&least->weight), loh); - - return least; -} - - -static struct ip_vs_scheduler ip_vs_wlc_scheduler = -{ - .name = "wlc", - .refcnt = ATOMIC_INIT(0), - .module = THIS_MODULE, - .n_list = LIST_HEAD_INIT(ip_vs_wlc_scheduler.n_list), - .init_service = ip_vs_wlc_init_svc, - .done_service = ip_vs_wlc_done_svc, - .update_service = ip_vs_wlc_update_svc, - .schedule = ip_vs_wlc_schedule, -}; - - -static int __init ip_vs_wlc_init(void) -{ - return register_ip_vs_scheduler(&ip_vs_wlc_scheduler); -} - -static void __exit ip_vs_wlc_cleanup(void) -{ - unregister_ip_vs_scheduler(&ip_vs_wlc_scheduler); -} - -module_init(ip_vs_wlc_init); -module_exit(ip_vs_wlc_cleanup); -MODULE_LICENSE("GPL"); |