linux-kernel - [RFC PATCH] power: move pm_qos update timeout handler to power-efficient workqueue

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Date:	Fri, 31 Jan 2014 13:48:22 -0800
From:	Zoran Markovic <zoran.markovic@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-pm@...r.kernel.org,
	Shaibal Dutta <shaibal.dutta@...adcom.com>,
	Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Zoran Markovic <zoran.markovic@...aro.org>
Subject: [RFC PATCH] power: move pm_qos update timeout handler to power-efficient workqueue

From: Shaibal Dutta <shaibal.dutta@...adcom.com>

To avoid waking up idle CPUs, allow the scheduler to select the best CPU
to handle pm_qos update timeouts. This extends idle residency times and
conserves power.

This functionality is enabled when CONFIG_WQ_POWER_EFFICIENT is selected.

Cc: Pavel Machek <pavel@....cz>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <len.brown@...el.com>
Signed-off-by: Shaibal Dutta <shaibal.dutta@...adcom.com>
[zoran.markovic@...aro.org: Rebased to latest kernel. Fixed code alignment.
Added commit message.]
Signed-off-by: Zoran Markovic <zoran.markovic@...aro.org>
---
 kernel/power/qos.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/power/qos.c b/kernel/power/qos.c
index 8dff9b4..5e35a3a 100644
--- a/kernel/power/qos.c
+++ b/kernel/power/qos.c
@@ -405,7 +405,8 @@ void pm_qos_update_request_timeout(struct pm_qos_request *req, s32 new_value,
 			pm_qos_array[req->pm_qos_class]->constraints,
 			&req->node, PM_QOS_UPDATE_REQ, new_value);
 
-	schedule_delayed_work(&req->work, usecs_to_jiffies(timeout_us));
+	queue_delayed_work(system_power_efficient_wq,
+			   &req->work, usecs_to_jiffies(timeout_us));
 }
 
 /**
-- 
1.7.9.5

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