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Subject[RFC][PATCH v5 12/14] sched: create a statistic structure
Date
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@linaro.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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