diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/sched.h | 31 | ||||
| -rw-r--r-- | include/linux/sched/sysctl.h | 1 |
2 files changed, 32 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index b82530481871..aa64a29d03be 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1241,8 +1241,39 @@ struct sched_statistics { }; #endif +#define RAVG_HIST_SIZE 5 + +/* ravg represents frequency scaled cpu-demand of tasks */ +struct ravg { + /* + * 'window_start' marks the beginning of new window + * + * 'mark_start' marks the beginning of an event (task waking up, task + * starting to execute, task being preempted) within a window + * + * 'sum' represents how runnable a task has been within current + * window. It incorporates both running time and wait time and is + * frequency scaled. + * + * 'sum_history' keeps track of history of 'sum' seen over previous + * RAVG_HIST_SIZE windows. Windows where task was entirely sleeping are + * ignored. + * + * 'demand' represents maximum sum seen over previous RAVG_HIST_SIZE + * windows. 'demand' could drive frequency demand for tasks. + */ + u64 window_start, mark_start; + u32 sum, demand; + u32 sum_history[RAVG_HIST_SIZE]; +}; + struct sched_entity { struct load_weight load; /* for load-balancing */ + /* + * Todo : Move ravg to 'struct task_struct', as this is common for both + * real-time and non-realtime tasks + */ + struct ravg ravg; struct rb_node run_node; struct list_head group_node; unsigned int on_rq; diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 336290e9724e..6ae7504665ad 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -40,6 +40,7 @@ extern unsigned int sysctl_sched_min_granularity; extern unsigned int sysctl_sched_wakeup_granularity; extern unsigned int sysctl_sched_child_runs_first; extern unsigned int sysctl_sched_wake_to_idle; +extern unsigned int sysctl_sched_ravg_window; enum sched_tunable_scaling { SCHED_TUNABLESCALING_NONE, |