net/ipv4: queue work on power efficient wq

Workqueue used in ipv4 layer have no real dependency of scheduling these on the
cpu which scheduled them.

On a idle system, it is observed that an idle cpu wakes up many times just to
service this work. It would be better if we can schedule it on a cpu which the
scheduler believes to be the most appropriate one.

This patch replaces normal workqueues with power efficient versions. This
doesn't change existing behavior of code unless CONFIG_WQ_POWER_EFFICIENT is
enabled.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 646023bd5449705f138fd2a01d9720a3cecc45e8..ac2dff3c2c1cf053cce19edf5179daf750dc2732 100644 (file)
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -474,7 +474,7 @@ static int __inet_insert_ifa(struct in_ifaddr *ifa, struct nlmsghdr *nlh,
        inet_hash_insert(dev_net(in_dev->dev), ifa);
 
        cancel_delayed_work(&check_lifetime_work);
-       schedule_delayed_work(&check_lifetime_work, 0);
+       queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
 
        /* Send message first, then call notifier.
           Notifier will trigger FIB update, so that
@@ -684,7 +684,8 @@ static void check_lifetime(struct work_struct *work)
        if (time_before(next_sched, now + ADDRCONF_TIMER_FUZZ_MAX))
                next_sched = now + ADDRCONF_TIMER_FUZZ_MAX;
 
-       schedule_delayed_work(&check_lifetime_work, next_sched - now);
+       queue_delayed_work(system_power_efficient_wq, &check_lifetime_work,
+                       next_sched - now);
 }
 
 static void set_ifa_lifetime(struct in_ifaddr *ifa, __u32 valid_lft,
@@ -842,7 +843,8 @@ static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
                ifa = ifa_existing;
                set_ifa_lifetime(ifa, valid_lft, prefered_lft);
                cancel_delayed_work(&check_lifetime_work);
-               schedule_delayed_work(&check_lifetime_work, 0);
+               queue_delayed_work(system_power_efficient_wq,
+                               &check_lifetime_work, 0);
                rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
                blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
        }
@@ -2322,7 +2324,7 @@ void __init devinet_init(void)
        register_gifconf(PF_INET, inet_gifconf);
        register_netdevice_notifier(&ip_netdev_notifier);
 
-       schedule_delayed_work(&check_lifetime_work, 0);
+       queue_delayed_work(system_power_efficient_wq, &check_lifetime_work, 0);
 
        rtnl_af_register(&inet_af_ops);