linux-kernel - Re: [RFC PATCH 2/4] x86, mwaitt: introduce mwaitx idle with a configurable timer

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Message-ID: <20150520160702.GH3645@pd.tnic>
Date:	Wed, 20 May 2015 18:07:02 +0200
From:	Borislav Petkov <bp@...e.de>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Huang Rui <ray.huang@....com>, Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>, Tony Li <tony.li@....com>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: Re: [RFC PATCH 2/4] x86, mwaitt: introduce mwaitx idle with a
 configurable timer

On Wed, May 20, 2015 at 04:55:58PM +0100, One Thousand Gnomes wrote:
> > That's not what appears to be happening here though: the MWAITX will 
> > return after the timeout.
> > 
> > Which isn't really useful unless we use it to drive timers.
> 
> What about things like mdelay() ?

It has an upper limit on the max timeout though: u32 TSC cycles.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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