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ipvs: Embed estimator object into stats object 

There's no reason for dynamically allocating an estimator object for every
stats object. Directly embed an estimator object into every stats object and
switch to using the kernel-provided list implementation. This makes the code
much simpler and faster, as we do not need to traverse the list of all
estimators to find the one belonging to a stats object. There's no need to use
an rwlock, as we only have one reader. Also reorder the members of the
estimator structure slightly to avoid padding overhead. This can't be done
with the stats object as the members are currently copied to our user space
object via memcpy() and changing it would break ABI.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
Acked-by: Simon Horman <horms@verge.net.au>
hifive-unleashed-5.1
Sven Wegener 2008-08-10 18:24:41 +00:00
parent 5587da55fb
commit 3a14a313f9
3 changed files with 63 additions and 80 deletions
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28
include/net/ip_vs.h
View File

@ -140,8 +140,24 @@ struct ip_vs_seq {
/*
* IPVS statistics object
* IPVS statistics objects
*/
struct ip_vs_estimator {
struct list_head list;
u64 last_inbytes;
u64 last_outbytes;
u32 last_conns;
u32 last_inpkts;
u32 last_outpkts;
u32 cps;
u32 inpps;
u32 outpps;
u32 inbps;
u32 outbps;
};
struct ip_vs_stats
{
__u32 conns; /* connections scheduled */
@ -156,7 +172,15 @@ struct ip_vs_stats
__u32 inbps; /* current in byte rate */
__u32 outbps; /* current out byte rate */
/*
* Don't add anything before the lock, because we use memcpy() to copy
* the members before the lock to struct ip_vs_stats_user in
* ip_vs_ctl.c.
*/
spinlock_t lock; /* spin lock */
struct ip_vs_estimator est; /* estimator */
};
struct dst_entry;
@ -659,7 +683,7 @@ extern void ip_vs_sync_conn(struct ip_vs_conn *cp);
/*
* IPVS rate estimator prototypes (from ip_vs_est.c)
*/
extern int ip_vs_new_estimator(struct ip_vs_stats *stats);
extern void ip_vs_new_estimator(struct ip_vs_stats *stats);
extern void ip_vs_kill_estimator(struct ip_vs_stats *stats);
extern void ip_vs_zero_estimator(struct ip_vs_stats *stats);

2
net/ipv4/ipvs/ip_vs_ctl.c
View File

@ -684,8 +684,8 @@ ip_vs_zero_stats(struct ip_vs_stats *stats)
{
spin_lock_bh(&stats->lock);
memset(stats, 0, (char *)&stats->lock - (char *)stats);
spin_unlock_bh(&stats->lock);
ip_vs_zero_estimator(stats);
spin_unlock_bh(&stats->lock);
}
/*

113
net/ipv4/ipvs/ip_vs_est.c
View File

@ -17,6 +17,7 @@
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/sysctl.h>
#include <linux/list.h>
#include <net/ip_vs.h>
@ -44,28 +45,11 @@
*/
struct ip_vs_estimator
{
struct ip_vs_estimator *next;
struct ip_vs_stats *stats;
static void estimation_timer(unsigned long arg);
u32 last_conns;
u32 last_inpkts;
u32 last_outpkts;
u64 last_inbytes;
u64 last_outbytes;
u32 cps;
u32 inpps;
u32 outpps;
u32 inbps;
u32 outbps;
};
static struct ip_vs_estimator *est_list = NULL;
static DEFINE_RWLOCK(est_lock);
static struct timer_list est_timer;
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)
{
@ -76,9 +60,9 @@ static void estimation_timer(unsigned long arg)
u64 n_inbytes, n_outbytes;
u32 rate;
read_lock(&est_lock);
for (e = est_list; e; e = e->next) {
s = e->stats;
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->conns;
@ -114,19 +98,16 @@ static void estimation_timer(unsigned long arg)
s->outbps = (e->outbps+0xF)>>5;
spin_unlock(&s->lock);
}
read_unlock(&est_lock);
spin_unlock(&est_lock);
mod_timer(&est_timer, jiffies + 2*HZ);
}
int ip_vs_new_estimator(struct ip_vs_stats *stats)
void ip_vs_new_estimator(struct ip_vs_stats *stats)
{
struct ip_vs_estimator *est;
struct ip_vs_estimator *est = &stats->est;
est = kzalloc(sizeof(*est), GFP_KERNEL);
if (est == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&est->list);
est->stats = stats;
est->last_conns = stats->conns;
est->cps = stats->cps<<10;
@ -142,62 +123,40 @@ int ip_vs_new_estimator(struct ip_vs_stats *stats)
est->last_outbytes = stats->outbytes;
est->outbps = stats->outbps<<5;
write_lock_bh(&est_lock);
est->next = est_list;
if (est->next == NULL) {
setup_timer(&est_timer, estimation_timer, 0);
est_timer.expires = jiffies + 2*HZ;
add_timer(&est_timer);
}
est_list = est;
write_unlock_bh(&est_lock);
return 0;
spin_lock_bh(&est_lock);
if (list_empty(&est_list))
mod_timer(&est_timer, jiffies + 2 * HZ);
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, **pest;
int killed = 0;
struct ip_vs_estimator *est = &stats->est;
write_lock_bh(&est_lock);
pest = &est_list;
while ((est=*pest) != NULL) {
if (est->stats != stats) {
pest = &est->next;
continue;
}
*pest = est->next;
kfree(est);
killed++;
}
while (killed && !est_list && try_to_del_timer_sync(&est_timer) < 0) {
write_unlock_bh(&est_lock);
spin_lock_bh(&est_lock);
list_del(&est->list);
while (list_empty(&est_list) && try_to_del_timer_sync(&est_timer) < 0) {
spin_unlock_bh(&est_lock);
cpu_relax();
write_lock_bh(&est_lock);
spin_lock_bh(&est_lock);
}
write_unlock_bh(&est_lock);
spin_unlock_bh(&est_lock);
}
void ip_vs_zero_estimator(struct ip_vs_stats *stats)
{
struct ip_vs_estimator *e;
struct ip_vs_estimator *est = &stats->est;
write_lock_bh(&est_lock);
for (e = est_list; e; e = e->next) {
if (e->stats != stats)
continue;
/* set counters zero */
e->last_conns = 0;
e->last_inpkts = 0;
e->last_outpkts = 0;
e->last_inbytes = 0;
e->last_outbytes = 0;
e->cps = 0;
e->inpps = 0;
e->outpps = 0;
e->inbps = 0;
e->outbps = 0;
}
write_unlock_bh(&est_lock);
/* 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;
}