From: Tejun Heo <tj@kernel.org>
To: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
tigran@aivazian.fsnet.co.uk, tglx@linutronix.de, mingo@elte.hu,
hpa@zytor.com, x86@kernel.org, linux-kernel@vger.kernel.org,
Linux PM mailing list <linux-pm@lists.linux-foundation.org>
Subject: Re: [BUGFIX][PATCH] Freezer, CPU hotplug, x86 Microcode: Fix task freezing failures
Date: Sun, 2 Oct 2011 12:50:23 -0700 [thread overview]
Message-ID: <20111002195023.GC31799@mtj.dyndns.org> (raw)
In-Reply-To: <4E88B5E0.6080503@linux.vnet.ibm.com>
Hello,
On Mon, Oct 03, 2011 at 12:35:04AM +0530, Srivatsa S. Bhat wrote:
> So, this patch addresses this issue by ensuring that microcode is not freed
> from kernel memory, nor invalidated when a CPU goes offline. Thus once the
> kernel gets the microcode during boot-up, it will never have to depend on
> userspace ever again to get microcode, since it never releases the copy it
> already has. So every run of the microcode callback for CPU online event will
> now succeed irrespective of whether userspace is frozen or not. As a result,
> this fixes the task freezing failure encountered while running CPU hotplug
> stress test along with suspend/resume operations simultaneously.
I'm not familiar with how microcode is supposed to be managed but is
it impossible for the newly hotplugged CPU (an actual hot unplug /
plug) may not like the microcode loaded for the previous CPU? Isn't
that why CPU_DEAD was invalidating the microcode?
Thanks.
--
tejun
next prev parent reply other threads:[~2011-10-02 19:50 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-02 19:05 Srivatsa S. Bhat
2011-10-02 19:36 ` Rafael J. Wysocki
2011-10-02 19:50 ` Tejun Heo [this message]
2011-10-02 20:04 ` Srivatsa S. Bhat
2011-10-03 0:40 ` Tejun Heo
2011-10-03 5:51 ` Srivatsa S. Bhat
2011-10-03 8:47 ` Borislav Petkov
2011-10-04 7:15 ` Tejun Heo
2011-10-04 13:15 ` Srivatsa S. Bhat
2011-10-04 13:46 ` Borislav Petkov
2011-10-04 17:14 ` Borislav Petkov
2011-10-04 19:49 ` Rafael J. Wysocki
2011-10-04 20:57 ` Srivatsa S. Bhat
2011-10-05 7:21 ` Borislav Petkov
2011-10-05 8:51 ` Srivatsa S. Bhat
2011-10-05 20:26 ` Rafael J. Wysocki
2011-10-05 21:15 ` Srivatsa S. Bhat
2011-10-05 22:43 ` Rafael J. Wysocki
2011-10-06 6:50 ` Srivatsa S. Bhat
2011-10-06 8:34 ` Borislav Petkov
2011-10-06 15:47 ` Srivatsa S. Bhat
2011-10-06 18:11 ` Srivatsa S. Bhat
2011-10-06 20:35 ` [BUGFIX][PATCH RESEND] " Srivatsa S. Bhat
2011-10-06 22:13 ` Tejun Heo
2011-10-06 22:34 ` Borislav Petkov
2011-10-07 16:48 ` Srivatsa S. Bhat
2011-10-07 18:05 ` Borislav Petkov
2011-10-04 13:25 ` [BUGFIX][PATCH] " Borislav Petkov
2011-10-05 8:33 ` Srivatsa S. Bhat
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