diff options
| author | Vincent Guittot <vincent.guittot@linaro.org> | 2013-07-23 11:07:07 +0200 |
|---|---|---|
| committer | Vincent Guittot <vincent.guittot@linaro.org> | 2013-10-17 22:11:02 +0200 |
| commit | aff0c477fde9e6a3db6a3fdeb861b165e9595929 (patch) | |
| tree | 8abfd32a212a6d08c10fb884ae94e86ec4473e38 | |
| parent | 6df5c916b4ebae9116e7960aa35cebbced6ee57d (diff) | |
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@linaro.org>
| -rw-r--r-- | include/linux/sched.h | 12 | ||||
| -rw-r--r-- | kernel/sched/fair.c | 5 |
2 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index 2004cdb33d61..d676aa297a9b 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 2d9f782a3498..ad8b99ae24b7 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) { |