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Date: Mon, 10 Oct 2011 23:13:00 +0200
From: Borislav Petkov <bp@...64.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
Ingo Molnar <mingo@...e.hu>, Borislav Petkov <bp@...64.org>,
"tigran@...azian.fsnet.co.uk" <tigran@...azian.fsnet.co.uk>,
"tglx@...utronix.de" <tglx@...utronix.de>,
"mingo@...hat.com" <mingo@...hat.com>,
"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
"amd64-microcode@...64.org" <amd64-microcode@...64.org>,
Tejun Heo <tj@...nel.org>,
Linux PM mailing list <linux-pm@...r.kernel.org>,
linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] CPU hotplug,x86 Microcode: Don't request
microcode from userspace unnecessarily
On Mon, Oct 10, 2011 at 04:58:02PM -0400, Rafael J. Wysocki wrote:
> On Sunday, October 09, 2011, Srivatsa S. Bhat wrote:
> > Requesting the microcode from userspace *every time* when onlining CPUs
> > (during a CPU hotplug operation) is unnecessary.
> >
> > So, this patch ensures that once the kernel gets the microcode after booting,
> > it is not freed nor invalidated when a CPU goes offline, so that it can be
> > reused when that CPU comes back online, without requesting userspace for it
> > again. As a result, the CPU hotplug operations become faster as well.
> >
> > Tested-by: Borislav Petkov <bp@...64.org>
> > Acked-by: Borislav Petkov <bp@...64.org>
> >
> > Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
>
> Fine by me. I wonder who should take this?
Ingo, most probably. ucode stuff goes in through -tip.
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