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Date: Fri, 13 Jan 2017 19:27:41 +0530 From: Balbir Singh <bsingharora@...il.com> To: Jérôme Glisse <jglisse@...hat.com> Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>, Russell King <linux@...linux.org.uk>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org>, Michael Ellerman <mpe@...erman.id.au>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, Chris Metcalf <cmetcalf@...lanox.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com> Subject: Re: [HMM v16 01/15] mm/memory/hotplug: convert device bool to int to allow for more flags v2 On Thu, Jan 12, 2017 at 11:30:28AM -0500, Jérôme Glisse wrote: > When hotpluging memory we want more informations on the type of memory and > its properties. Replace the device boolean flag by an int and define a set > of flags. > > New property for device memory is an opt-in flag to allow page migration > from and to a ZONE_DEVICE. Existing user of ZONE_DEVICE are not expecting > page migration to work for their pages. New changes to page migration i > changing that and we now need a flag to explicitly opt-in page migration. Given that ZONE_DEVICE is dependent on X86_64, do we need to touch all architectures? I guess we could selectively enable things as we enable ZONE_DEVICE for other architectures? Balbir Singh.
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