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net/sched: act_police: use per-cpu counters 

use per-CPU counters, instead of sharing a single set of stats with all
cores. This removes the need of using spinlock when statistics are read
or updated.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti 2018-09-13 19:29:12 +02:00 коммит произвёл David S. Miller
Родитель c3ec8bcceb
Коммит 93be42f917
1 изменённых файлов: 22 добавлений и 24 удалений
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46
net/sched/act_police.c
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@ -110,7 +110,7 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
if (!exists) {
ret = tcf_idr_create(tn, parm->index, NULL, a,
&act_police_ops, bind, false);
&act_police_ops, bind, true);
if (ret) {
tcf_idr_cleanup(tn, parm->index);
return ret;
@ -137,7 +137,8 @@ static int tcf_police_init(struct net *net, struct nlattr *nla,
}
if (est) {
err = gen_replace_estimator(&police->tcf_bstats, NULL,
err = gen_replace_estimator(&police->tcf_bstats,
police->common.cpu_bstats,
&police->tcf_rate_est,
&police->tcf_lock,
NULL, est);
@ -207,32 +208,27 @@ static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
struct tcf_police *police = to_police(a);
s64 now;
s64 toks;
s64 ptoks = 0;
s64 now, toks, ptoks = 0;
int ret;
tcf_lastuse_update(&police->tcf_tm);
bstats_cpu_update(this_cpu_ptr(police->common.cpu_bstats), skb);
spin_lock(&police->tcf_lock);
bstats_update(&police->tcf_bstats, skb);
tcf_lastuse_update(&police->tcf_tm);
if (police->tcfp_ewma_rate) {
struct gnet_stats_rate_est64 sample;
if (!gen_estimator_read(&police->tcf_rate_est, &sample) ||
sample.bps >= police->tcfp_ewma_rate) {
police->tcf_qstats.overlimits++;
if (police->tcf_action == TC_ACT_SHOT)
police->tcf_qstats.drops++;
spin_unlock(&police->tcf_lock);
return police->tcf_action;
ret = police->tcf_action;
goto inc_overlimits;
}
}
if (qdisc_pkt_len(skb) <= police->tcfp_mtu) {
if (!police->rate_present) {
spin_unlock(&police->tcf_lock);
return police->tcfp_result;
ret = police->tcfp_result;
goto unlock;
}
now = ktime_get_ns();
@ -253,18 +249,20 @@ static int tcf_police_act(struct sk_buff *skb, const struct tc_action *a,
police->tcfp_t_c = now;
police->tcfp_toks = toks;
police->tcfp_ptoks = ptoks;
if (police->tcfp_result == TC_ACT_SHOT)
police->tcf_qstats.drops++;
spin_unlock(&police->tcf_lock);
return police->tcfp_result;
ret = police->tcfp_result;
goto inc_drops;
}
}
ret = police->tcf_action;
police->tcf_qstats.overlimits++;
if (police->tcf_action == TC_ACT_SHOT)
police->tcf_qstats.drops++;
inc_overlimits:
qstats_overlimit_inc(this_cpu_ptr(police->common.cpu_qstats));
inc_drops:
if (ret == TC_ACT_SHOT)
qstats_drop_inc(this_cpu_ptr(police->common.cpu_qstats));
unlock:
spin_unlock(&police->tcf_lock);
return police->tcf_action;
return ret;
}
static int tcf_police_dump(struct sk_buff *skb, struct tc_action *a,