diff options
Diffstat (limited to 'Documentation/scheduler')
| -rw-r--r-- | Documentation/scheduler/sched-design-CFS.rst | 8 | ||||
| -rw-r--r-- | Documentation/scheduler/schedutil.rst | 7 |
2 files changed, 7 insertions, 8 deletions
diff --git a/Documentation/scheduler/sched-design-CFS.rst b/Documentation/scheduler/sched-design-CFS.rst index f68919800f..6cffffe265 100644 --- a/Documentation/scheduler/sched-design-CFS.rst +++ b/Documentation/scheduler/sched-design-CFS.rst @@ -180,7 +180,7 @@ This is the (partial) list of the hooks: compat_yield sysctl is turned on; in that case, it places the scheduling entity at the right-most end of the red-black tree. - - check_preempt_curr(...) + - wakeup_preempt(...) This function checks if a task that entered the runnable state should preempt the currently running task. @@ -189,10 +189,10 @@ This is the (partial) list of the hooks: This function chooses the most appropriate task eligible to run next. - - set_curr_task(...) + - set_next_task(...) - This function is called when a task changes its scheduling class or changes - its task group. + This function is called when a task changes its scheduling class, changes + its task group or is scheduled. - task_tick(...) diff --git a/Documentation/scheduler/schedutil.rst b/Documentation/scheduler/schedutil.rst index 32c7d69fc8..803fba8fc7 100644 --- a/Documentation/scheduler/schedutil.rst +++ b/Documentation/scheduler/schedutil.rst @@ -90,8 +90,8 @@ For more detail see: - Documentation/scheduler/sched-capacity.rst:"1. CPU Capacity + 2. Task utilization" -UTIL_EST / UTIL_EST_FASTUP -========================== +UTIL_EST +======== Because periodic tasks have their averages decayed while they sleep, even though when running their expected utilization will be the same, they suffer a @@ -99,8 +99,7 @@ though when running their expected utilization will be the same, they suffer a To alleviate this (a default enabled option) UTIL_EST drives an Infinite Impulse Response (IIR) EWMA with the 'running' value on dequeue -- when it is -highest. A further default enabled option UTIL_EST_FASTUP modifies the IIR -filter to instantly increase and only decay on decrease. +highest. UTIL_EST filters to instantly increase and only decay on decrease. A further runqueue wide sum (of runnable tasks) is maintained of: |