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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Borislav Petkov <bp@amd64.org>
Cc: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com>,
	Ingo Molnar <mingo@elte.hu>,
	"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 23:18:26 +0200	[thread overview]
Message-ID: <201110102318.27146.rjw@sisk.pl> (raw)
In-Reply-To: <20111010211300.GA31606@aftab>

On Monday, October 10, 2011, Borislav Petkov wrote:
> 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.

OK, so

Acked-by: Rafael J. Wysocki <rjw@sisk.pl>

Thanks,
Rafael

  reply	other threads:[~2011-10-10 21:16 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-08 20:47 [PATCH] " 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
2011-10-10 21:18           ` Rafael J. Wysocki [this message]
2011-10-11  8:41       ` Andreas Herrmann

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