linux-kernel - Re: [PATCH 34/40] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT

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Date:	Mon, 02 Jul 2012 00:58:17 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 34/40] autonuma: add CONFIG_AUTONUMA and CONFIG_AUTONUMA_DEFAULT_ENABLED

On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
> Add the config options to allow building the kernel with AutoNUMA.
>
> If CONFIG_AUTONUMA_DEFAULT_ENABLED is "=y", then
> /sys/kernel/mm/autonuma/enabled will be equal to 1, and AutoNUMA will
> be enabled automatically at boot.
>
> CONFIG_AUTONUMA currently depends on X86, because no other arch
> implements the pte/pmd_numa yet and selecting =y would result in a
> failed build, but this shall be relaxed in the future. Porting
> AutoNUMA to other archs should be pretty simple.
>
> Signed-off-by: Andrea Arcangeli<aarcange@...hat.com>

The Makefile changes could be merged into this patch

> diff --git a/mm/Kconfig b/mm/Kconfig
> index 82fed4e..330dd51 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -207,6 +207,19 @@ config MIGRATION
>   	  pages as migration can relocate pages to satisfy a huge page
>   	  allocation instead of reclaiming.
>
> +config AUTONUMA
> +	bool "Auto NUMA"
> +	select MIGRATION
> +	depends on NUMA&&  X86

How about having the x86 architecture export a
HAVE_AUTONUMA flag, and testing for that?

> +	help
> +	  Automatic NUMA CPU scheduling and memory migration.

This could be expanded to list advantages and
disadvantages of having autonuma enabled.

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