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

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Message-ID: <52B34759.3010009@zytor.com>
Date:	Thu, 19 Dec 2013 11:22:01 -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 10:19 AM, Ingo Molnar wrote:
> 
> ( It would also be nice to know whether MONITOR loads that cacheline 
>   into the CPUs cache, and in what state it loads it. )
> 

I would assume that is implementation-dependent.  However, one plausible
implementation is to load the cache line into the cache in shared state
and monitor for evictions.

	-hpa


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