linux-kernel - Re: [RFC][PATCH 10/14] x86: generic aperf/mperf code.

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Message-ID: <4AA1524F.7030404@zytor.com>
Date:	Fri, 04 Sep 2009 10:45:51 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Dave Jones <davej@...hat.com>, Thomas Renninger <trenn@...e.de>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Gautham R Shenoy <ego@...ibm.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Balbir Singh <balbir@...ibm.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Yanmin <yanmin_zhang@...ux.intel.com>,
	Len Brown <len.brown@...el.com>,
	Yinghai Lu <yhlu.kernel@...il.com>, cpufreq@...r.kernel.org
Subject: Re: [RFC][PATCH 10/14] x86: generic aperf/mperf code.

On 09/04/2009 07:42 AM, Peter Zijlstra wrote:
>>
>> any 64-bit cpu that supports it can have a 32bit kernel installed on it.
>> (and a significant number of users actually do this).
> 
> 1) we really should be pushing those people to run 64bit kernels
> 
> [ I'm still hoping distros will start shipping 64bit kernels and have
>   the bootloader pick the 64bit one when the hardware supports lm ]
> 

FWIW, there is already support in Syslinux to do that.

If what distros want is a single kernel image that can boot into either
mode, that might be an interesting enhancement to wraplinux.

	-hpa

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