Function report |
Source Code:kernel\sched\fair.c |
Create Date:2022-07-28 09:38:14 |
Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:Update the current task's runtime statistics.
Proto:static void update_curr(struct cfs_rq *cfs_rq)
Type:void
Parameter:
Type | Parameter | Name |
---|---|---|
struct cfs_rq * | cfs_rq |
834 | curr = 'curr' points to currently running entity on this cfs_rq.* It is set to NULL otherwise (i.e when none are currently running). |
835 | now = rq_clock_task(rq_of(cfs_rq)) |
838 | If Value for the false possibility is greater at compile time(!curr) Then Return |
841 | delta_exec = now - exec_start |
842 | If Value for the false possibility is greater at compile time((s64)delta_exec <= 0) Then Return |
845 | exec_start = now |
847 | schedstat_set(exec_max, max - return maximum of two values of the same or compatible types*@x: first value*@y: second value(delta_exec, exec_max)) |
850 | sum_exec_runtime += delta_exec |
853 | vruntime += delta /= w |
856 | If entity_is_task(curr) Then |
Name | Describe |
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update_curr_fair | |
reweight_entity | |
enqueue_entity | MIGRATION* dequeue* update_curr()* update_min_vruntime()* vruntime -= min_vruntime* enqueue* update_curr()* update_min_vruntime()* vruntime += min_vruntime* this way the vruntime transition between RQs is done when both* min_vruntime are up-to-date |
dequeue_entity | |
put_prev_entity | |
entity_tick | |
check_preempt_wakeup | Preempt the current task with a newly woken task if needed: |
yield_task_fair | sched_yield() is very simple* The magic of dealing with the ->skip buddy is in pick_next_entity. |
task_fork_fair | alled on fork with the child task as argument from the parent's context* - child not yet on the tasklist* - preemption disabled |
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