[RFC PATCH] net: ipv4: move inetpeer garbage collector work to power efficient workqueue

[Zoran Markovic]

From: Shaibal Dutta <shaibal.dutta@xxxxxxxxxxxx>

Garbage collector work does not have to be bound to the CPU that scheduled
it. By moving work to the power-efficient workqueue, the selection of
CPU executing the work is left to the scheduler. This extends idle
residency times and conserves power.

This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.

Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
Cc: James Morris <jmorris@xxxxxxxxx>
Cc: Hideaki YOSHIFUJI <yoshfuji@xxxxxxxxxxxxxx>
Cc: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Shaibal Dutta <shaibal.dutta@xxxxxxxxxxxx>
[zoran.markovic@xxxxxxxxxx: Rebased to latest kernel version. Added
commit message.]
Signed-off-by: Zoran Markovic <zoran.markovic@xxxxxxxxxx>
---
 net/ipv4/inetpeer.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/inetpeer.c b/net/ipv4/inetpeer.c
index 48f4244..87155aa 100644
--- a/net/ipv4/inetpeer.c
+++ b/net/ipv4/inetpeer.c
@@ -161,7 +161,8 @@ static void inetpeer_gc_worker(struct work_struct *work)
 	list_splice(&list, &gc_list);
 	spin_unlock_bh(&gc_lock);
 
-	schedule_delayed_work(&gc_work, gc_delay);
+	queue_delayed_work(system_power_efficient_wq,
+		&gc_work, gc_delay);
 }
 
 /* Called from ip_output.c:ip_init  */
@@ -576,7 +577,8 @@ static void inetpeer_inval_rcu(struct rcu_head *head)
 	list_add_tail(&p->gc_list, &gc_list);
 	spin_unlock_bh(&gc_lock);
 
-	schedule_delayed_work(&gc_work, gc_delay);
+	queue_delayed_work(system_power_efficient_wq,
+		&gc_work, gc_delay);
 }
 
 void inetpeer_invalidate_tree(struct inet_peer_base *base)
-- 
1.7.9.5

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