linux-kernel - [PATCH] cpuidle: sysfs: Export target residency information

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Date:	Mon, 17 Mar 2014 12:17:30 +0100
From:	Daniel Lezcano <daniel.lezcano@...aro.org>
To:	rjw@...ysocki.net, lenb@...nel.org
Cc:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH] cpuidle: sysfs: Export target residency information

>From userspace, there is no way to know the target residency for each idle
state. If we want to write tools to measure the accuracy of the idle state
selection from the governor, we need this info.

As the exit latency is exported through sysfs, exporting the target residency
in the same place makes sense.

Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
---
 drivers/cpuidle/sysfs.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index e918b6d..efe2f17 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -293,6 +293,7 @@ static ssize_t show_state_##_name(struct cpuidle_state *state, \
 }
 
 define_show_state_function(exit_latency)
+define_show_state_function(target_residency)
 define_show_state_function(power_usage)
 define_show_state_ull_function(usage)
 define_show_state_ull_function(time)
@@ -304,6 +305,7 @@ define_store_state_ull_function(disable)
 define_one_state_ro(name, show_state_name);
 define_one_state_ro(desc, show_state_desc);
 define_one_state_ro(latency, show_state_exit_latency);
+define_one_state_ro(residency, show_state_target_residency);
 define_one_state_ro(power, show_state_power_usage);
 define_one_state_ro(usage, show_state_usage);
 define_one_state_ro(time, show_state_time);
@@ -313,6 +315,7 @@ static struct attribute *cpuidle_state_default_attrs[] = {
 	&attr_name.attr,
 	&attr_desc.attr,
 	&attr_latency.attr,
+	&attr_residency.attr,
 	&attr_power.attr,
 	&attr_usage.attr,
 	&attr_time.attr,
-- 
1.7.9.5

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