diff options
Diffstat (limited to 'net/netfilter/ipvs/ip_vs_est.c')
| -rw-r--r-- | net/netfilter/ipvs/ip_vs_est.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/net/netfilter/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c new file mode 100644 index 0000000..2eb2860 --- /dev/null +++ b/net/netfilter/ipvs/ip_vs_est.c @@ -0,0 +1,166 @@ +/* + * ip_vs_est.c: simple rate estimator for IPVS + * + * 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: + * + */ +#include <linux/kernel.h> +#include <linux/jiffies.h> +#include <linux/slab.h> +#include <linux/types.h> +#include <linux/interrupt.h> +#include <linux/sysctl.h> +#include <linux/list.h> + +#include <net/ip_vs.h> + +/* + This code is to estimate rate in a shorter interval (such as 8 + seconds) for virtual services and real servers. For measure rate in a + long interval, it is easy to implement a user level daemon which + periodically reads those statistical counters and measure rate. + + Currently, the measurement is activated by slow timer handler. Hope + this measurement will not introduce too much load. + + We measure rate during the last 8 seconds every 2 seconds: + + avgrate = avgrate*(1-W) + rate*W + + where W = 2^(-2) + + NOTES. + + * The stored value for average bps is scaled by 2^5, so that maximal + rate is ~2.15Gbits/s, average pps and cps are scaled by 2^10. + + * A lot code is taken from net/sched/estimator.c + */ + + +static void estimation_timer(unsigned long arg); + +static LIST_HEAD(est_list); +static DEFINE_SPINLOCK(est_lock); +static DEFINE_TIMER(est_timer, estimation_timer, 0, 0); + +static void estimation_timer(unsigned long arg) +{ + struct ip_vs_estimator *e; + struct ip_vs_stats *s; + u32 n_conns; + u32 n_inpkts, n_outpkts; + u64 n_inbytes, n_outbytes; + u32 rate; + + spin_lock(&est_lock); + list_for_each_entry(e, &est_list, list) { + s = container_of(e, struct ip_vs_stats, est); + + spin_lock(&s->lock); + n_conns = s->ustats.conns; + n_inpkts = s->ustats.inpkts; + n_outpkts = s->ustats.outpkts; + n_inbytes = s->ustats.inbytes; + n_outbytes = s->ustats.outbytes; + + /* scaled by 2^10, but divided 2 seconds */ + rate = (n_conns - e->last_conns)<<9; + e->last_conns = n_conns; + e->cps += ((long)rate - (long)e->cps)>>2; + s->ustats.cps = (e->cps+0x1FF)>>10; + + rate = (n_inpkts - e->last_inpkts)<<9; + e->last_inpkts = n_inpkts; + e->inpps += ((long)rate - (long)e->inpps)>>2; + s->ustats.inpps = (e->inpps+0x1FF)>>10; + + rate = (n_outpkts - e->last_outpkts)<<9; + e->last_outpkts = n_outpkts; + e->outpps += ((long)rate - (long)e->outpps)>>2; + s->ustats.outpps = (e->outpps+0x1FF)>>10; + + rate = (n_inbytes - e->last_inbytes)<<4; + e->last_inbytes = n_inbytes; + e->inbps += ((long)rate - (long)e->inbps)>>2; + s->ustats.inbps = (e->inbps+0xF)>>5; + + rate = (n_outbytes - e->last_outbytes)<<4; + e->last_outbytes = n_outbytes; + e->outbps += ((long)rate - (long)e->outbps)>>2; + s->ustats.outbps = (e->outbps+0xF)>>5; + spin_unlock(&s->lock); + } + spin_unlock(&est_lock); + mod_timer(&est_timer, jiffies + 2*HZ); +} + +void ip_vs_new_estimator(struct ip_vs_stats *stats) +{ + struct ip_vs_estimator *est = &stats->est; + + INIT_LIST_HEAD(&est->list); + + est->last_conns = stats->ustats.conns; + est->cps = stats->ustats.cps<<10; + + est->last_inpkts = stats->ustats.inpkts; + est->inpps = stats->ustats.inpps<<10; + + est->last_outpkts = stats->ustats.outpkts; + est->outpps = stats->ustats.outpps<<10; + + est->last_inbytes = stats->ustats.inbytes; + est->inbps = stats->ustats.inbps<<5; + + est->last_outbytes = stats->ustats.outbytes; + est->outbps = stats->ustats.outbps<<5; + + spin_lock_bh(&est_lock); + list_add(&est->list, &est_list); + spin_unlock_bh(&est_lock); +} + +void ip_vs_kill_estimator(struct ip_vs_stats *stats) +{ + struct ip_vs_estimator *est = &stats->est; + + spin_lock_bh(&est_lock); + list_del(&est->list); + spin_unlock_bh(&est_lock); +} + +void ip_vs_zero_estimator(struct ip_vs_stats *stats) +{ + struct ip_vs_estimator *est = &stats->est; + + /* set counters zero, caller must hold the stats->lock lock */ + est->last_inbytes = 0; + est->last_outbytes = 0; + est->last_conns = 0; + est->last_inpkts = 0; + est->last_outpkts = 0; + est->cps = 0; + est->inpps = 0; + est->outpps = 0; + est->inbps = 0; + est->outbps = 0; +} + +int __init ip_vs_estimator_init(void) +{ + mod_timer(&est_timer, jiffies + 2 * HZ); + return 0; +} + +void ip_vs_estimator_cleanup(void) +{ + del_timer_sync(&est_timer); +} |
