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

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Message-ID: <52B33640.3020204@zytor.com>
Date:	Thu, 19 Dec 2013 10:09:04 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.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 09:07 AM, Ingo Molnar wrote:
> 
> Likewise, having a barrier before the MONITOR looks sensible as well. 
> Having it _after_ monitor looks weird and is probably wrong. [It might 
> have been the effects of someone seeing the spurious wakeup problems 
> with realizing the true source, or so.]
> 

Does anyone know the history of this barrier after the monitor?  I know
Len is looking for a minimal patchset that can go into -stable, and it
seems prudent to not preturb the code more than necessary, but going
forward it would be nice to know...

	-hpa


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