linux-kernel - Re: [RFC PATCH 01/12] mm: add a new config to manage the code

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Date:	Mon, 8 Jun 2015 19:36:01 +0300
From:	Leon Romanovsky <leon@...n.nu>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Xishi Qiu <qiuxishi@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"nao.horiguchi@...il.com" <nao.horiguchi@...il.com>,
	Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"mingo@...e.hu" <mingo@...e.hu>, Xiexiuqi <xiexiuqi@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 01/12] mm: add a new config to manage the code

On Mon, Jun 8, 2015 at 6:14 PM, Luck, Tony <tony.luck@...el.com> wrote:
>> > +config MEMORY_MIRROR
>> > +       bool "Address range mirroring support"
>> > +       depends on X86 && NUMA
>> > +       default y
>> Is it correct for the systems (NOT xeon) without memory support built in?
>
> Is the "&& NUMA" doing that?  If you support NUMA, then you are not a minimal
> config for a tablet or laptop.
>
> If you want a symbol that has a stronger correlation to high end Xeon features
> then perhaps MEMORY_FAILURE?
I would like to see the default set to be "n".
On my machine (x86_64) defconfig enables this feature and I don't know
if this feature can work there.

➜  linux-mm git:(dev) ✗ make defconfig ARCH=x86
  HOSTCC  scripts/basic/fixdep
  HOSTCC  scripts/basic/bin2c
  HOSTCC  scripts/kconfig/conf.o
  HOSTCC  scripts/kconfig/zconf.tab.o
  HOSTLD  scripts/kconfig/conf
*** Default configuration is based on 'x86_64_defconfig'
#
# configuration written to .config
#
➜  linux-mm git:(dev) ✗ grep CONFIG_MEMORY_MIRROR .config
CONFIG_MEMORY_MIRROR=y


>
> -Tony



-- 
Leon Romanovsky | Independent Linux Consultant
        www.leon.nu | leon@...n.nu
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