linux-kernel - [RFC][PATCH v5 12/14] sched: create a statistic structure

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Date:	Fri, 18 Oct 2013 13:52:25 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	linux-kernel@...r.kernel.org, peterz@...radead.org,
	mingo@...nel.org, pjt@...gle.com, Morten.Rasmussen@....com,
	cmetcalf@...era.com, tony.luck@...el.com, alex.shi@...el.com,
	preeti@...ux.vnet.ibm.com, linaro-kernel@...ts.linaro.org
Cc:	rjw@...k.pl, paulmck@...ux.vnet.ibm.com, corbet@....net,
	tglx@...utronix.de, len.brown@...el.com, arjan@...ux.intel.com,
	amit.kucheria@...aro.org, l.majewski@...sung.com,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: [RFC][PATCH v5 12/14] sched: create a statistic structure

Create a statistic structure that will be used to share information with
other frameworks like cpuidle and cpufreq. This structure only contains the
current wake up latency of a core for now but could be extended with other
usefull information.

Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
---
 include/linux/sched.h |   12 +++++++++++-
 kernel/sched/fair.c   |    5 +++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 2004cdb..d676aa2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2,7 +2,7 @@
 #define _LINUX_SCHED_H
 
 #include <uapi/linux/sched.h>
-
+#include <linux/atomic.h>
 
 struct sched_param {
 	int sched_priority;
@@ -63,6 +63,16 @@ struct fs_struct;
 struct perf_event_context;
 struct blk_plug;
 
+/* This structure is used to share information and statistics with other
+ * frameworks. It only shares wake up latency fro the moment but should be
+ * extended with other usefull informations
+ */
+struct sched_pm {
+	atomic_t  wake_latency; /* time to wake up the cpu */
+};
+
+DECLARE_PER_CPU(struct sched_pm, sched_stat);
+
 /*
  * List of flags we want to share for kernel threads,
  * if only because they are not used by them anyway.
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 2d9f782..ad8b99a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -178,6 +178,11 @@ void sched_init_granularity(void)
 	update_sysctl();
 }
 
+/* Save per_cpu information that will be shared with other frameworks */
+DEFINE_PER_CPU(struct sched_pm, sched_stat) = {
+	.wake_latency = ATOMIC_INIT(0)
+};
+
 #ifdef CONFIG_SMP
 static unsigned long available_of(int cpu)
 {
-- 
1.7.9.5

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