linux-kernel - Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series

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Message-ID: <20090209101552.GF20467@elte.hu>
Date:	Mon, 9 Feb 2009 11:15:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>
Cc:	H Peter Anvin <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Add clflush before monitor for Intel 7400 series
	- v2


* Pallipadi, Venkatesh <venkatesh.pallipadi@...el.com> wrote:

> For Intel 7400 series CPUs, the recommendation is to use a clflush on the 
> monitored address just before monitor and mwait pair [1]. This clflush makes sure 
> that there are no false wakeups from mwait when the monitored address was recently 
> written to.
> 
> [1] "MONITOR/MWAIT Recommendations for Intel Xeon Processor 7400 series"
> section in specification update document of 7400 series
> http://download.intel.com/design/xeon/specupdt/32033601.pdf
> 
> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>
> 
> ---
> 
> Earlier patch:
> http://marc.info/?l=linux-kernel&m=122341330606025&w=2
> 
> Current changes:
> Minor modification based on Peter's comment
> 
>  arch/x86/include/asm/cpufeature.h |    1 +
>  arch/x86/kernel/cpu/intel.c       |    3 +++
>  arch/x86/kernel/process.c         |    6 ++++++
>  3 files changed, 10 insertions(+)

applied to tip/x86/urgent, thanks Venki!

	Ingo
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