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From: Robert Richter <robert.richter@caviumnetworks.com>
To: Ganapatrao Kulkarni <gpkulkarni@gmail.com>
Cc: David Daney <ddaney@caviumnetworks.com>,
	Will Deacon <will.deacon@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	<linux-efi@vger.kernel.org>, Pawel Moll <pawel.moll@arm.com>,
	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Matt Fleming <matt@codeblueprint.co.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	David Daney <david.daney@cavium.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Rob Herring <robh+dt@kernel.org>,
	David Daney <ddaney.cavm@gmail.com>,
	Kumar Gala <galak@codeaurora.org>,
	Grant Likely <grant.likely@linaro.org>,
	Ganapatrao Kulkarni <gkulkarni@caviumnetworks.com>,
	Frank Rowand <frowand.list@gmail.com>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v12 4/5] arm64, numa: Add NUMA support for arm64 platforms.
Date: Mon, 29 Feb 2016 11:12:36 +0100	[thread overview]
Message-ID: <20160229101236.GQ24726@rric.localdomain> (raw)
In-Reply-To: <CAFpQJXURSKFw6RmNVLiB=YDcUiaaQLz3zMvM9gy=b1MobaCfgg@mail.gmail.com>

On 27.02.16 09:43:49, Ganapatrao Kulkarni wrote:
> On Sat, Feb 27, 2016 at 1:21 AM, David Daney <ddaney@caviumnetworks.com> wrote:
> > On 02/26/2016 10:53 AM, Will Deacon wrote:

> >>> +static __init int numa_parse_early_param(char *opt)
> >>> +{
> >>> +       if (!opt)
> >>> +               return -EINVAL;
> >>> +       if (!strncmp(opt, "off", 3)) {
> >>> +               pr_info("%s\n", "NUMA turned off");
> >>> +               numa_off = 1;
> >>> +       }
> >>> +       return 0;
> >>> +}
> >>> +early_param("numa", numa_parse_early_param);
> >>
> >>
> >> Curious, but when is this option actually useful?
> >>
> >
> > Good point.  I will remove that bit, it was used as an aid in debugging
> > while bringing up the patch set.
> 
> this is handy in debugging new platforms.
> this boot argument option forces to boot as single node dummy system
> adding all resources to node0.

This is used to disable numa in a numa enabled kernel esp. for
debugging/enabling/booting single node systems. Same kernel parameter
as for x86 and other archs. Should not being removed.

-Robert

  reply	other threads:[~2016-02-29 10:13 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-23  1:58 [PATCH v12 0/5] arm64, numa: Add numa support for arm64 platforms David Daney
2016-02-23  1:58 ` [PATCH v12 1/5] efi: ARM/arm64: ignore DT memory nodes instead of removing them David Daney
2016-02-23 11:58   ` Mark Rutland
2016-02-23 12:16     ` Will Deacon
2016-02-23 12:20       ` Ard Biesheuvel
2016-02-23 22:12     ` Rob Herring
2016-02-24 19:38       ` Mark Rutland
2016-02-24 19:03     ` Frank Rowand
2016-02-24 19:30       ` Rob Herring
2016-02-24 19:33       ` Mark Rutland
2016-02-23  1:58 ` [PATCH v12 2/5] Documentation, dt, numa: dt bindings for NUMA David Daney
2016-02-23  1:58 ` [PATCH v12 3/5] dt, numa: Add NUMA dt binding implementation David Daney
2016-02-29 17:29   ` Robert Richter
2016-02-29 18:13     ` David Daney
2016-02-29 19:45       ` Robert Richter
2016-02-29 22:56         ` David Daney
2016-02-23  1:58 ` [PATCH v12 4/5] arm64, numa: Add NUMA support for arm64 platforms David Daney
2016-02-23 10:26   ` Will Deacon
2016-02-23 17:34     ` David Daney
2016-02-23 17:39   ` David Daney
2016-02-26 18:53   ` Will Deacon
2016-02-26 19:51     ` David Daney
2016-02-27  4:13       ` Ganapatrao Kulkarni
2016-02-29 10:12         ` Robert Richter [this message]
2016-02-29 17:34   ` Robert Richter
2016-02-29 23:42     ` David Daney
2016-03-01 12:21       ` Robert Richter
2016-02-23  1:58 ` [PATCH v12 5/5] arm64, mm, numa: Add NUMA balancing support for arm64 David Daney
2016-02-26 18:53   ` Will Deacon
2016-02-26 19:26     ` David Daney

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