linux-kernel - Re: [PATCH] x86 idle: repair large-server 50-watt idle-power regression

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Message-ID: <52B323BE.7090108@zytor.com>
Date:	Thu, 19 Dec 2013 08:50:06 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...nel.org>, Len Brown <lenb@...nel.org>,
	x86@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>,
	stable@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mike Galbraith <efault@....de>, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86 idle: repair large-server 50-watt idle-power regression

On 12/19/2013 08:21 AM, Peter Zijlstra wrote:
> 
> What's that mb for?
> 

It already exists in mwait_idle_with_hints(); I just moved it into this
common function.  It is a bit odd, I have to admit; it seems like it
should be *before* the monitor (and possibly we should have one after
the CLFLUSH as well?)

> Also, can you please merge:
> 
>   http://marc.info/?l=linux-kernel&m=138685838420632
> 
> Thomas said he would pick up that series, but seems to have gone missing
> the past week or so.
> 

We need to get the immediate regression fixed.
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