[net-next 0/2] ipvs: speedup ipvs netns dismantle

[net-next 0/2] ipvs: speedup ipvs netns dismantle

[Haishuang Yan]

Implement exit_batch() method to dismantle more ipvs netns
per round.

Haishuang Yan (2):
  ipvs: batch __ip_vs_cleanup
  ipvs: batch __ip_vs_dev_cleanup

 include/net/ip_vs.h             |  2 +-
 net/netfilter/ipvs/ip_vs_core.c | 49 +++++++++++++++++++++++++----------------
 net/netfilter/ipvs/ip_vs_ctl.c  | 13 ++++++++---
 3 files changed, 41 insertions(+), 23 deletions(-)

-- 
1.8.3.1

[net-next 1/2] ipvs: batch __ip_vs_cleanup

[Haishuang Yan]

It's better to batch __ip_vs_cleanup to speedup ipvs
connections dismantle.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
---
 include/net/ip_vs.h             |  2 +-
 net/netfilter/ipvs/ip_vs_core.c | 29 +++++++++++++++++------------
 net/netfilter/ipvs/ip_vs_ctl.c  | 13 ++++++++++---
 3 files changed, 28 insertions(+), 16 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 3759167..93e7a25 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -1324,7 +1324,7 @@ static inline void ip_vs_control_del(struct ip_vs_conn *cp)
 void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
 void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
 void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
-void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
+void ip_vs_service_nets_cleanup(struct list_head *net_list);
 
 /* IPVS application functions
  * (from ip_vs_app.c)
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 46f06f9..b4d79b7 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -2402,18 +2402,23 @@ static int __net_init __ip_vs_init(struct net *net)
 	return -ENOMEM;
 }
 
-static void __net_exit __ip_vs_cleanup(struct net *net)
+static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
 {
-	struct netns_ipvs *ipvs = net_ipvs(net);
-
-	ip_vs_service_net_cleanup(ipvs);	/* ip_vs_flush() with locks */
-	ip_vs_conn_net_cleanup(ipvs);
-	ip_vs_app_net_cleanup(ipvs);
-	ip_vs_protocol_net_cleanup(ipvs);
-	ip_vs_control_net_cleanup(ipvs);
-	ip_vs_estimator_net_cleanup(ipvs);
-	IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
-	net->ipvs = NULL;
+	struct netns_ipvs *ipvs;
+	struct net *net;
+	LIST_HEAD(list);
+
+	ip_vs_service_nets_cleanup(net_list);	/* ip_vs_flush() with locks */
+	list_for_each_entry(net, net_list, exit_list) {
+		ipvs = net_ipvs(net);
+		ip_vs_conn_net_cleanup(ipvs);
+		ip_vs_app_net_cleanup(ipvs);
+		ip_vs_protocol_net_cleanup(ipvs);
+		ip_vs_control_net_cleanup(ipvs);
+		ip_vs_estimator_net_cleanup(ipvs);
+		IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
+		net->ipvs = NULL;
+	}
 }
 
 static int __net_init __ip_vs_dev_init(struct net *net)
@@ -2442,7 +2447,7 @@ static void __net_exit __ip_vs_dev_cleanup(struct net *net)
 
 static struct pernet_operations ipvs_core_ops = {
 	.init = __ip_vs_init,
-	.exit = __ip_vs_cleanup,
+	.exit_batch = __ip_vs_cleanup_batch,
 	.id   = &ip_vs_net_id,
 	.size = sizeof(struct netns_ipvs),
 };
diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 07e0967..c8e652b 100644
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -1607,14 +1607,21 @@ static int ip_vs_flush(struct netns_ipvs *ipvs, bool cleanup)
 
 /*
  *	Delete service by {netns} in the service table.
- *	Called by __ip_vs_cleanup()
+ *	Called by __ip_vs_batch_cleanup()
  */
-void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs)
+void ip_vs_service_nets_cleanup(struct list_head *net_list)
 {
+	struct netns_ipvs *ipvs;
+	struct net *net;
+	LIST_HEAD(list);
+
 	EnterFunction(2);
 	/* Check for "full" addressed entries */
 	mutex_lock(&__ip_vs_mutex);
-	ip_vs_flush(ipvs, true);
+	list_for_each_entry(net, net_list, exit_list) {
+		ipvs = net_ipvs(net);
+		ip_vs_flush(ipvs, true);
+	}
 	mutex_unlock(&__ip_vs_mutex);
 	LeaveFunction(2);
 }
-- 
1.8.3.1

[net-next 2/2] ipvs: batch __ip_vs_dev_cleanup

[Haishuang Yan]

It's better to batch __ip_vs_cleanup to speedup ipvs
devices dismantle.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
---
 net/netfilter/ipvs/ip_vs_core.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index b4d79b7..58af24a 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -2434,14 +2434,20 @@ static int __net_init __ip_vs_dev_init(struct net *net)
 	return ret;
 }
 
-static void __net_exit __ip_vs_dev_cleanup(struct net *net)
+static void __net_exit __ip_vs_dev_cleanup_batch(struct list_head *net_list)
 {
-	struct netns_ipvs *ipvs = net_ipvs(net);
+	struct netns_ipvs *ipvs;
+	struct net *net;
+	LIST_HEAD(list);
+
 	EnterFunction(2);
-	nf_unregister_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
-	ipvs->enable = 0;	/* Disable packet reception */
-	smp_wmb();
-	ip_vs_sync_net_cleanup(ipvs);
+	list_for_each_entry(net, net_list, exit_list) {
+		ipvs = net_ipvs(net);
+		nf_unregister_net_hooks(net, ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
+		ipvs->enable = 0;	/* Disable packet reception */
+		smp_wmb();
+		ip_vs_sync_net_cleanup(ipvs);
+	}
 	LeaveFunction(2);
 }
 
@@ -2454,7 +2460,7 @@ static void __net_exit __ip_vs_dev_cleanup(struct net *net)
 
 static struct pernet_operations ipvs_core_dev_ops = {
 	.init = __ip_vs_dev_init,
-	.exit = __ip_vs_dev_cleanup,
+	.exit_batch = __ip_vs_dev_cleanup_batch,
 };
 
 /*
-- 
1.8.3.1

Re: [net-next 1/2] ipvs: batch __ip_vs_cleanup

[Julian Anastasov]

	Hello,

On Sat, 13 Jul 2019, Haishuang Yan wrote:

> It's better to batch __ip_vs_cleanup to speedup ipvs
> connections dismantle.
> 
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
> ---
>  include/net/ip_vs.h             |  2 +-
>  net/netfilter/ipvs/ip_vs_core.c | 29 +++++++++++++++++------------
>  net/netfilter/ipvs/ip_vs_ctl.c  | 13 ++++++++++---
>  3 files changed, 28 insertions(+), 16 deletions(-)
> 
> diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
> index 3759167..93e7a25 100644
> --- a/include/net/ip_vs.h
> +++ b/include/net/ip_vs.h
> @@ -1324,7 +1324,7 @@ static inline void ip_vs_control_del(struct ip_vs_conn *cp)
>  void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
>  void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
>  void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
> -void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
> +void ip_vs_service_nets_cleanup(struct list_head *net_list);
>  
>  /* IPVS application functions
>   * (from ip_vs_app.c)
> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
> index 46f06f9..b4d79b7 100644
> --- a/net/netfilter/ipvs/ip_vs_core.c
> +++ b/net/netfilter/ipvs/ip_vs_core.c
> @@ -2402,18 +2402,23 @@ static int __net_init __ip_vs_init(struct net *net)
>  	return -ENOMEM;
>  }
>  
> -static void __net_exit __ip_vs_cleanup(struct net *net)
> +static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
>  {
> -	struct netns_ipvs *ipvs = net_ipvs(net);
> -
> -	ip_vs_service_net_cleanup(ipvs);	/* ip_vs_flush() with locks */
> -	ip_vs_conn_net_cleanup(ipvs);
> -	ip_vs_app_net_cleanup(ipvs);
> -	ip_vs_protocol_net_cleanup(ipvs);
> -	ip_vs_control_net_cleanup(ipvs);
> -	ip_vs_estimator_net_cleanup(ipvs);
> -	IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
> -	net->ipvs = NULL;
> +	struct netns_ipvs *ipvs;
> +	struct net *net;
> +	LIST_HEAD(list);
> +
> +	ip_vs_service_nets_cleanup(net_list);	/* ip_vs_flush() with locks */
> +	list_for_each_entry(net, net_list, exit_list) {

	How much faster is to replace list_for_each_entry in
ops_exit_list() with this one. IPVS can waste time in calls
such as kthread_stop() and del_timer_sync() but I'm not sure
we can solve it easily. What gain do you see in benchmarks?

> +		ipvs = net_ipvs(net);
> +		ip_vs_conn_net_cleanup(ipvs);
> +		ip_vs_app_net_cleanup(ipvs);
> +		ip_vs_protocol_net_cleanup(ipvs);
> +		ip_vs_control_net_cleanup(ipvs);
> +		ip_vs_estimator_net_cleanup(ipvs);
> +		IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
> +		net->ipvs = NULL;
> +	}
>  }

Regards

--
Julian Anastasov <ja@ssi.bg>

Re: [net-next 1/2] ipvs: batch __ip_vs_cleanup

[Haishuang Yan]

> On 2019年7月16日, at 上午4:39, Julian Anastasov <ja@ssi.bg> wrote:
> 
> 
> 	Hello,
> 
> On Sat, 13 Jul 2019, Haishuang Yan wrote:
> 
>> It's better to batch __ip_vs_cleanup to speedup ipvs
>> connections dismantle.
>> 
>> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
>> ---
>> include/net/ip_vs.h             |  2 +-
>> net/netfilter/ipvs/ip_vs_core.c | 29 +++++++++++++++++------------
>> net/netfilter/ipvs/ip_vs_ctl.c  | 13 ++++++++++---
>> 3 files changed, 28 insertions(+), 16 deletions(-)
>> 
>> diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
>> index 3759167..93e7a25 100644
>> --- a/include/net/ip_vs.h
>> +++ b/include/net/ip_vs.h
>> @@ -1324,7 +1324,7 @@ static inline void ip_vs_control_del(struct ip_vs_conn *cp)
>> void ip_vs_control_net_cleanup(struct netns_ipvs *ipvs);
>> void ip_vs_estimator_net_cleanup(struct netns_ipvs *ipvs);
>> void ip_vs_sync_net_cleanup(struct netns_ipvs *ipvs);
>> -void ip_vs_service_net_cleanup(struct netns_ipvs *ipvs);
>> +void ip_vs_service_nets_cleanup(struct list_head *net_list);
>> 
>> /* IPVS application functions
>>  * (from ip_vs_app.c)
>> diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
>> index 46f06f9..b4d79b7 100644
>> --- a/net/netfilter/ipvs/ip_vs_core.c
>> +++ b/net/netfilter/ipvs/ip_vs_core.c
>> @@ -2402,18 +2402,23 @@ static int __net_init __ip_vs_init(struct net *net)
>> 	return -ENOMEM;
>> }
>> 
>> -static void __net_exit __ip_vs_cleanup(struct net *net)
>> +static void __net_exit __ip_vs_cleanup_batch(struct list_head *net_list)
>> {
>> -	struct netns_ipvs *ipvs = net_ipvs(net);
>> -
>> -	ip_vs_service_net_cleanup(ipvs);	/* ip_vs_flush() with locks */
>> -	ip_vs_conn_net_cleanup(ipvs);
>> -	ip_vs_app_net_cleanup(ipvs);
>> -	ip_vs_protocol_net_cleanup(ipvs);
>> -	ip_vs_control_net_cleanup(ipvs);
>> -	ip_vs_estimator_net_cleanup(ipvs);
>> -	IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
>> -	net->ipvs = NULL;
>> +	struct netns_ipvs *ipvs;
>> +	struct net *net;
>> +	LIST_HEAD(list);
>> +
>> +	ip_vs_service_nets_cleanup(net_list);	/* ip_vs_flush() with locks */
>> +	list_for_each_entry(net, net_list, exit_list) {
> 
> 	How much faster is to replace list_for_each_entry in
> ops_exit_list() with this one. IPVS can waste time in calls
> such as kthread_stop() and del_timer_sync() but I'm not sure
> we can solve it easily. What gain do you see in benchmarks?

Hi, 

As the following benchmark testing results show, there is a little performance improvement:

$  cat add_del_unshare.sh
#!/bin/bash

for i in `seq 1 100`
    do
     (for j in `seq 1 40` ; do  unshare -n ipvsadm -A -t 172.16.$i.$j:80 >/dev/null ; done) &
    done
wait; grep net_namespace /proc/slabinfo

Befor patch:
$  time sh add_del_unshare.sh
net_namespace       4020   4020   4736    6    8 : tunables    0    0    0 : slabdata    670    670      0

real    0m8.086s
user    0m2.025s
sys     0m36.956s

After patch:
$  time sh add_del_unshare.sh
net_namespace       4020   4020   4736    6    8 : tunables    0    0    0 : slabdata    670    670      0

real    0m7.623s
user    0m2.003s
sys     0m32.935s


> 
>> +		ipvs = net_ipvs(net);
>> +		ip_vs_conn_net_cleanup(ipvs);
>> +		ip_vs_app_net_cleanup(ipvs);
>> +		ip_vs_protocol_net_cleanup(ipvs);
>> +		ip_vs_control_net_cleanup(ipvs);
>> +		ip_vs_estimator_net_cleanup(ipvs);
>> +		IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
>> +		net->ipvs = NULL;
>> +	}
>> }
> 
> Regards
> 
> --
> Julian Anastasov <ja@ssi.bg>
> 

Re: [net-next 1/2] ipvs: batch __ip_vs_cleanup

[Julian Anastasov]

	Hello,

On Thu, 18 Jul 2019, Haishuang Yan wrote:

> As the following benchmark testing results show, there is a little performance improvement:

	OK, can you send v2 after removing the LIST_HEAD(list) from
both patches, I guess, it is not needed. If you prefer, you can
include these benchmark results too.

> $  cat add_del_unshare.sh
> #!/bin/bash
> 
> for i in `seq 1 100`
>     do
>      (for j in `seq 1 40` ; do  unshare -n ipvsadm -A -t 172.16.$i.$j:80 >/dev/null ; done) &
>     done
> wait; grep net_namespace /proc/slabinfo
> 
> Befor patch:
> $  time sh add_del_unshare.sh
> net_namespace       4020   4020   4736    6    8 : tunables    0    0    0 : slabdata    670    670      0
> 
> real    0m8.086s
> user    0m2.025s
> sys     0m36.956s
> 
> After patch:
> $  time sh add_del_unshare.sh
> net_namespace       4020   4020   4736    6    8 : tunables    0    0    0 : slabdata    670    670      0
> 
> real    0m7.623s
> user    0m2.003s
> sys     0m32.935s
> 
> 
> > 
> >> +		ipvs = net_ipvs(net);
> >> +		ip_vs_conn_net_cleanup(ipvs);
> >> +		ip_vs_app_net_cleanup(ipvs);
> >> +		ip_vs_protocol_net_cleanup(ipvs);
> >> +		ip_vs_control_net_cleanup(ipvs);
> >> +		ip_vs_estimator_net_cleanup(ipvs);
> >> +		IP_VS_DBG(2, "ipvs netns %d released\n", ipvs->gen);
> >> +		net->ipvs = NULL;

Regards

--
Julian Anastasov <ja@ssi.bg>