lkml.org 
[lkml]   [2019]   [Mar]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v7 02/15] sched/core: uclamp: Enforce last task UCLAMP_MAX
On Fri, Feb 08, 2019 at 10:05:41AM +0000, Patrick Bellasi wrote:
> +static inline void uclamp_idle_reset(struct rq *rq, unsigned int clamp_id,
> + unsigned int clamp_value)
> +{
> + /* Reset max-clamp retention only on idle exit */
> + if (!(rq->uclamp_flags & UCLAMP_FLAG_IDLE))
> + return;
> +
> + WRITE_ONCE(rq->uclamp[clamp_id].value, clamp_value);
> +
> + /*
> + * This function is called for both UCLAMP_MIN (before) and UCLAMP_MAX
> + * (after). The idle flag is reset only the second time, when we know
> + * that UCLAMP_MIN has been already updated.

Why do we care? That is, what is this comment trying to tell us.

> + */
> + if (clamp_id == UCLAMP_MAX)
> + rq->uclamp_flags &= ~UCLAMP_FLAG_IDLE;
> +}

\
 
 \ /
  Last update: 2019-03-13 15:13    [W:0.325 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site