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/linux/Documentation/scheduler/
H A Dsched-util-clamp.rst10 Utilization clamping, also known as util clamp or uclamp, is a scheduler
39 the uclamp values as performance points rather than utilization is a better
78 By making these uclamp performance requests, or rather hints, user space can
100 Both SCHED_NORMAL/OTHER and SCHED_FIFO/RR honour uclamp requests/hints.
102 In the SCHED_FIFO/RR case, uclamp gives the option to run RT tasks at any
110 when an RT task wakes up. This cost is unchanged by using uclamp. Uclamp only
114 See :ref:`section 3.4 <uclamp-default-values>` for default values and
137 affected by the uclamp settings of all the tasks enqueued on it. For example if
143 rq, uclamp must do some housekeeping at every enqueue/dequeue, which is the
154 uclamp value at rq level a lot easier.
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H A Dsched-capacity.rst348 Furthermore, uclamp lets userspace specify a minimum and a maximum utilization
357 above. On top of that, uclamp is used to clamp the task utilization values,
363 By using uclamp, userspace can e.g. allow a busy loop (100% utilization) to run
364 on any CPU by giving it a low uclamp.max value. Conversely, it can force a small
366 giving it a high uclamp.min value.
/linux/Documentation/translations/zh_CN/scheduler/
H A Dsched-capacity.rst307 此外，uclamp允许用户空间指定任务的最小和最大利用率，要么以sched_setattr()的方式，要么以
308 cgroup接口的方式（参阅Documentation/admin-guide/cgroup-v2.rst）。如其名字所暗示，uclamp
314 CFS任务唤醒的CPU选择，遵循上面描述的算力适应性准则。在此之上，uclamp被用来限制任务利用率，
320 通过使用uclamp，举例来说，用户空间可以允许忙等待循环（100%使用率）在任意CPU上运行，只要给
321 它设置低的uclamp.max值。相反，uclamp能强制一个小的周期性任务（比如，10%利用率）在最高性能
322 的CPU上运行，只要给它设置高的uclamp.min值。
/linux/kernel/sched/
H A Dcore.c583 * - uclamp_update_active() p->uclamp*
1494 * This knob allows admins to change the default behavior when uclamp is being
1510 * This static key is used to reduce the uclamp overhead in the fast path. It
1514 * This allows users to continue to enable uclamp in their kernel config with
1515 * minimum uclamp overhead in the fast path.
1517 * As soon as userspace modifies any of the uclamp knobs, the static key is
1518 * enabled, since we have an actual users that make use of uclamp
1523 * * A task modifying its uclamp value with sched_setattr().
1525 * * An admin modifying the cgroup cpu.uclamp.{min, max}
1560 struct uclamp_bucket *bucket = rq->uclamp[clamp_i in uclamp_rq_max_value()
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H A Dsched.h524 struct uclamp_se uclamp[UCLAMP_CNT]; member
1168 struct uclamp_rq uclamp[UCLAMP_CNT] ____cacheline_aligned; member
3563 return READ_ONCE(rq->uclamp[clamp_id].value); in uclamp_rq_get()
3569 WRITE_ONCE(rq->uclamp[clamp_id].value, value); in uclamp_rq_set()
3587 max_util = READ_ONCE(rq->uclamp[UCLAMP_MAX].value); in uclamp_rq_is_capped()
/linux/include/linux/
H A Dsched.h906 struct uclamp_se uclamp[UCLAMP_CNT]; member