linux-kernel - Re: [PATCH] x86: use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz" again

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Date:   Tue, 14 Nov 2017 16:34:43 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        WANG Chao <chao.wang@...oud.cn>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Mathias Krause <minipli@...glemail.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH] x86: use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz" again

On Tue, Nov 14, 2017 at 4:30 PM, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
>
> OK, so may I queue it up?
>
> I don't think I can get that to work substantially faster anyway ...

Yeah, I think it's ok.

If somebody is really doing that /proc/cpuinfo in a loop, the rate
limiting should kick in. And if you do it only once, getting the right
frequency is worth it, I think.

             Linus