linux-kernel - Re: perf hw in kexeced kernel broken in tip

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Message-ID: <4CFFDA7C.5050303@kernel.org>
Date:	Wed, 08 Dec 2010 11:20:28 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Don Zickus <dzickus@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Vivek Goyal <vgoyal@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Jason Wessel <jason.wessel@...driver.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haren Myneni <hbabu@...ibm.com>
Subject: Re: perf hw  in kexeced kernel broken in tip

On 12/08/2010 11:06 AM, Peter Zijlstra wrote:
>> then still can use perf etc after we kexec from RHEL or SLES kernel to
>> later kernel ( from 2.6.37)
> 
> I'm not sure why people would do that, but yeah I guess we can do
> something like that.

more problem:
system with linuxbios and have kernel in flash as bootloader. they may kexec to final production kernel. 

and they may need to update that embedded kernel to shutdown perf....

Yinghai
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