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>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"hpa@zytor.com" <hpa@zytor.com>,
"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
Date: Mon, 10 Oct 2011 23:13:00 +0200 [thread overview]
Message-ID: <20111010211300.GA31606@aftab> (raw)
In-Reply-To: <201110102258.02628.rjw@sisk.pl>
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.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
next prev parent reply other threads:[~2011-10-10 21:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-08 20:47 [PATCH] CPU hotplug,x86 Microcode: Don't request microcode from userspace unnecessarily Srivatsa S. Bhat
2011-10-09 11:27 ` Borislav Petkov
2011-10-09 19:38 ` Srivatsa S. Bhat
2011-10-09 19:42 ` [PATCH RESEND] " Srivatsa S. Bhat
2011-10-10 20:58 ` Rafael J. Wysocki
2011-10-10 21:13 ` Borislav Petkov [this message]
2011-10-10 21:18 ` Rafael J. Wysocki
2011-10-11 8:41 ` Andreas Herrmann
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