From: Peter Zijlstra <peterz@infradead.org>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Don Zickus <dzickus@redhat.com>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Vivek Goyal <vgoyal@redhat.com>, Ingo Molnar <mingo@elte.hu>,
Jason Wessel <jason.wessel@windriver.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Haren Myneni <hbabu@us.ibm.com>
Subject: Re: perf hw in kexeced kernel broken in tip
Date: Wed, 08 Dec 2010 20:06:36 +0100 [thread overview]
Message-ID: <1291835196.28378.145.camel@laptop> (raw)
In-Reply-To: <4CFFD1C2.1080108@kernel.org>
On Wed, 2010-12-08 at 10:43 -0800, Yinghai Lu wrote:
> can you add sth force_... in command line to take over ownership of
> perf from BIOS or previous kernel ?
The problem is, you cannot steal the thing from the BIOS, you'll trample
on its settings and the next time it runs it will simply re-instate it.
And aside from probing the EN bit on boot there is no way of determining
this.
So forcing the state might get you an ill-functioning system.
> 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.
next prev parent reply other threads:[~2010-12-08 19:06 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-01 8:00 perf hw in kexeced kernel broken in tip Yinghai Lu
2010-12-01 11:27 ` Peter Zijlstra
2010-12-01 16:06 ` Vivek Goyal
2010-12-01 16:11 ` Peter Zijlstra
2010-12-01 16:23 ` Vivek Goyal
2010-12-01 19:38 ` Peter Zijlstra
2010-12-01 19:46 ` Vivek Goyal
2010-12-01 19:49 ` Peter Zijlstra
2010-12-01 19:58 ` Vivek Goyal
2010-12-01 20:07 ` Peter Zijlstra
2010-12-01 21:48 ` Eric W. Biederman
2010-12-02 5:23 ` Don Zickus
2010-12-02 7:34 ` Peter Zijlstra
2010-12-02 16:15 ` Don Zickus
2010-12-07 23:30 ` Peter Zijlstra
2010-12-08 14:01 ` Don Zickus
2010-12-08 14:20 ` Peter Zijlstra
2010-12-08 14:42 ` Vivek Goyal
2010-12-08 14:48 ` Peter Zijlstra
2010-12-08 15:02 ` Vivek Goyal
2010-12-08 15:15 ` Peter Zijlstra
2010-12-08 15:22 ` Vivek Goyal
2010-12-08 21:16 ` Eric W. Biederman
2010-12-08 14:59 ` Peter Zijlstra
2010-12-08 18:43 ` Yinghai Lu
2010-12-08 19:01 ` Don Zickus
2010-12-08 19:05 ` Yinghai Lu
2010-12-08 19:17 ` Peter Zijlstra
2010-12-08 19:20 ` Yinghai Lu
2010-12-08 19:06 ` Peter Zijlstra [this message]
2010-12-08 19:20 ` Yinghai Lu
2010-12-08 22:37 ` Don Zickus
2010-12-08 23:20 ` Eric W. Biederman
2010-12-09 4:34 ` Don Zickus
2010-12-09 20:20 ` Don Zickus
2010-12-09 20:44 ` Cyrill Gorcunov
2010-12-08 14:33 ` Peter Zijlstra
2010-12-08 14:39 ` Vivek Goyal
2010-12-07 21:16 ` Don Zickus
2010-12-08 0:26 ` Yinghai Lu
2010-12-08 10:39 ` Peter Zijlstra
2010-12-01 20:41 ` Eric W. Biederman
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