linux-kernel - Re: [PATCH 1/3] cpuidle/menu: stop seeking deeper idle if current state is too deep

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Message-ID: <1483631039.25514.1.camel@redhat.com>
Date:   Thu, 05 Jan 2017 10:43:59 -0500
From:   Rik van Riel <riel@...hat.com>
To:     Alex Shi <alex.shi@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        vincent.guittot@...aro.org,
        open list <linux-kernel@...r.kernel.org>
Cc:     linux-pm@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [PATCH 1/3] cpuidle/menu: stop seeking deeper idle if current
 state is too deep

On Thu, 2017-01-05 at 23:29 +0800, Alex Shi wrote:
> The obsolete commit 71abbbf85 want to introduce a dynamic cstates,
> but it was removed for long time. Just left the nonsense deeper
> cstate
> checking.
> 
> Since all target_residency and exit_latency are going longer in
> deeper
> idle state, no needs to waste some cpu cycle on useless seeking.

Makes me wonder if it would be worth documenting the
requirement that c-states be listed in increasing
order?

Acked-by: Rik van Riel <riel@...hat.com>