Re: [PATCH v12 6/8] sched/fair: Add sched group latency support

[Michal Koutný]

On Mon, Feb 27, 2023 at 02:44:22PM +0100, Vincent Guittot <vincent.guittot@xxxxxxxxxx> wrote:
> Regarding the current use of latency nice to set a latency offset, the
> problem doesn't appear because latency offset applies between entities
> at the same level as you mentioned above

Splendid, it turned out that way (latency nice analogous to bandwidth
nice).

> Does  my explanation above make sense to you ?

Yes, thank you.

Thus, I'd like to propose avoiding the use of "limit" in this context and
stress the horizontal scope. For example:

> +     This interface file allows reading and setting latency using the
> +     same values used by sched_setattr(2). The latency_nice of a group is
> +     used to limit the impact of the latency_nice of a task outside the
> +     group.

+     This interface file allows reading and setting latency using the
+     same values used by sched_setattr(2). The latency_nice of a group is
+     used to modify group members' latency with respect to sibling groups.

Regards,
Michal

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