Release 4.11 net/netfilter/ipvs/ip_vs_lc.c
/*
* IPVS: Least-Connection Scheduling module
*
* 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:
* Wensong Zhang : added the ip_vs_lc_update_svc
* Wensong Zhang : added any dest with weight=0 is quiesced
*
*/
#define KMSG_COMPONENT "IPVS"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <net/ip_vs.h>
/*
* Least Connection scheduling
*/
static struct ip_vs_dest *
ip_vs_lc_schedule(struct ip_vs_service *svc, const struct sk_buff *skb,
struct ip_vs_iphdr *iph)
{
struct ip_vs_dest *dest, *least = NULL;
unsigned int loh = 0, doh;
IP_VS_DBG(6, "%s(): Scheduling...\n", __func__);
/*
* Simply select the server with the least number of
* (activeconns<<5) + inactconns
* Except whose weight is equal to zero.
* If the weight is equal to zero, it means that the server is
* quiesced, the existing connections to the server still get
* served, but no new connection is assigned to the server.
*/
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
if ((dest->flags & IP_VS_DEST_F_OVERLOAD) ||
atomic_read(&dest->weight) == 0)
continue;
doh = ip_vs_dest_conn_overhead(dest);
if (!least || doh < loh) {
least = dest;
loh = doh;
}
}
if (!least)
ip_vs_scheduler_err(svc, "no destination available");
else
IP_VS_DBG_BUF(6, "LC: server %s:%u activeconns %d "
"inactconns %d\n",
IP_VS_DBG_ADDR(least->af, &least->addr),
ntohs(least->port),
atomic_read(&least->activeconns),
atomic_read(&least->inactconns));
return least;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Wensong Zhang | 122 | 72.62% | 1 | 8.33% |
| Julian Anastasov | 21 | 12.50% | 5 | 41.67% |
| Simon Horman | 7 | 4.17% | 1 | 8.33% |
| Julius Volz | 6 | 3.57% | 1 | 8.33% |
| Patrick Schaaf | 4 | 2.38% | 1 | 8.33% |
| Stephen Hemminger | 4 | 2.38% | 1 | 8.33% |
| Hannes Eder | 3 | 1.79% | 1 | 8.33% |
| Changli Gao | 1 | 0.60% | 1 | 8.33% |
| Total | 168 | 100.00% | 12 | 100.00% |
static struct ip_vs_scheduler ip_vs_lc_scheduler = {
.name = "lc",
.refcnt = ATOMIC_INIT(0),
.module = THIS_MODULE,
.n_list = LIST_HEAD_INIT(ip_vs_lc_scheduler.n_list),
.schedule = ip_vs_lc_schedule,
};
static int __init ip_vs_lc_init(void)
{
return register_ip_vs_scheduler(&ip_vs_lc_scheduler) ;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Wensong Zhang | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
static void __exit ip_vs_lc_cleanup(void)
{
unregister_ip_vs_scheduler(&ip_vs_lc_scheduler);
synchronize_rcu();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Wensong Zhang | 15 | 83.33% | 1 | 50.00% |
| Julian Anastasov | 3 | 16.67% | 1 | 50.00% |
| Total | 18 | 100.00% | 2 | 100.00% |
module_init(ip_vs_lc_init);
module_exit(ip_vs_lc_cleanup);
MODULE_LICENSE("GPL");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Wensong Zhang | 208 | 74.55% | 1 | 6.25% |
| Julian Anastasov | 24 | 8.60% | 6 | 37.50% |
| Hannes Eder | 14 | 5.02% | 2 | 12.50% |
| Sven Wegener | 10 | 3.58% | 1 | 6.25% |
| Simon Horman | 7 | 2.51% | 1 | 6.25% |
| Julius Volz | 6 | 2.15% | 1 | 6.25% |
| Stephen Hemminger | 4 | 1.43% | 1 | 6.25% |
| Patrick Schaaf | 4 | 1.43% | 1 | 6.25% |
| Changli Gao | 1 | 0.36% | 1 | 6.25% |
| Adrian Bunk | 1 | 0.36% | 1 | 6.25% |
| Total | 279 | 100.00% | 16 | 100.00% |
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