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Date: Mon, 10 Oct 2011 23:13:00 +0200
From: Borislav Petkov <bp@amd64.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
        Ingo Molnar <mingo@elte.hu>, Borislav Petkov <bp@amd64.org>,
        "tigran@aivazian.fsnet.co.uk" <tigran@aivazian.fsnet.co.uk>,
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        "x86@kernel.org" <x86@kernel.org>,
        "Herrmann3, Andreas" <Andreas.Herrmann3@amd.com>,
        "amd64-microcode@amd64.org" <amd64-microcode@amd64.org>,
        Tejun Heo <tj@kernel.org>,
        Linux PM mailing list <linux-pm@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RESEND] CPU hotplug,x86 Microcode: Don't request
 microcode from userspace unnecessarily
Message-ID: <20111010211300.GA31606@aftab>
References: <4E90B6F9.8020804@linux.vnet.ibm.com>
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 <4E91F908.5010006@linux.vnet.ibm.com>
 <201110102258.02628.rjw@sisk.pl>
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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@amd64.org>
> > Acked-by: Borislav Petkov <bp@amd64.org>
> > 
> > Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
> 
> Fine by me.  I wonder who should take this?

Ingo, most probably. ucode stuff goes in through -tip.

-- 
Regards/Gruss,
Boris.

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