linux-kernel - Re: [PATCH v3 2/2] x86, mwaitt: introduce mwaix delay with a configurable timer

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Message-ID: <20150612075033.GA24767@hr-slim.amd.com>
Date:	Fri, 12 Jun 2015 15:50:33 +0800
From:	Huang Rui <ray.huang@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	X86 ML <x86@...nel.org>, Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	Tony Li <tony.li@....com>, Ken Xue <ken.xue@....com>
Subject: Re: [PATCH v3 2/2] x86, mwaitt: introduce mwaix delay with a
 configurable timer

On Fri, Jun 12, 2015 at 09:38:48AM +0200, Peter Zijlstra wrote:
> On Fri, Jun 12, 2015 at 12:03:22PM +0800, Huang Rui wrote:
> 
> > > What's the purpose of the "enable" parameter?
> > > 
> > 
> > Enable mwaitx timer. Should I add comments to explain the usage?
> 
> No, you should read your own patch, notice that the only usage site
> provides a true, then realize its a redundant bit of code and kill it
> dead.

Yeah, but I remembered at last time, someone tell me we shouldn't
force to set timer always enabled. So I add this interface to expose
more clearly. :)

So could I use __mwaitx directly like below:

__monitorx(&dummy, 0, 0);
__mwaitx(0xf, delay, MWAITX_ECX_TIMER_ENABLE);


Thanks,
Rui
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