linux-kernel - Re: [PATCH 3/3] cpuidle/menu: add per cpu pm_qos_resume

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Date:   Sun, 22 Jan 2017 09:31:44 +0800
From:   Alex Shi <alex.shi@...aro.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Arjan van de Ven <arjan@...ux.intel.com>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 3/3] cpuidle/menu: add per cpu pm_qos_resume_latency
 consideration


> Yeah, that could be problematic. The code snippet gives the general idea but it
> could be changed by for example by a flag telling the cpus when they enter idle
> to update their state_count. Or something like that.

Yes, this idea could be helpful.

But since the idle path isn't a hot path. and a few memory access won't 
cost a lot. So I doubt if the benefit could be measurable.


>
> But if you think the patchset is fine, it is ok, we can improve things afterwards.
>