linux-kernel - RE: [RFC PATCH 00/12] mm: mirrored memory support for page buddy allocations

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Date:	Fri, 19 Jun 2015 18:42:39 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Vlastimil Babka <vbabka@...e.cz>,
	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 00/12] mm: mirrored memory support for page buddy
 allocations

> What's your suggestions? a new zone or a new migratetype?
> Maybe add a new zone will change more mm code.

I don't understand this code well enough (yet) to make a recommendation.  I think
our primary concern may not be "how much code we change", but more "how can
we minimize the run-time impact on systems that don't have any mirrored memory.

Just putting all the heavy work behind a CONFIG option isn't sufficient ... we want
enterprise distributions to ship with the option turned on ... even though most
machines won't be using this feature.

-Tony

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