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Date: Tue, 25 Aug 2020 10:11:29 +0800 From: Wei Yang <richard.weiyang@...ux.alibaba.com> To: Oscar Salvador <osalvador@...e.de> Cc: David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Michal Hocko <mhocko@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, Wei Yang <richard.weiyang@...ux.alibaba.com>, Baoquan He <bhe@...hat.com>, Pankaj Gupta <pankaj.gupta.linux@...il.com> Subject: Re: [PATCH v2 02/10] mm/memory_hotplug: enforce section granularity when onlining/offlining On Mon, Aug 24, 2020 at 12:39:18PM +0200, Oscar Salvador wrote: >On Wed, Aug 19, 2020 at 07:59:49PM +0200, David Hildenbrand wrote: >> Already two people (including me) tried to offline subsections, because >> the function looks like it can deal with it. But we really can only >> online/offline full sections that are properly aligned (e.g., we can only >> mark full sections online/offline via SECTION_IS_ONLINE). >> >> Add a simple safety net to document the restriction now. Current users >> (core and powernv/memtrace) respect these restrictions. > >It's been a while since I looked at sub-section handling stuff so sorry to ask >this, but was it true that we can hot-{remove,add} sub-section granularity, while >we can only online /offline on section granularity? > Seems you are right. >> >> Acked-by: Michal Hocko <mhocko@...e.com> >> Cc: Andrew Morton <akpm@...ux-foundation.org> >> Cc: Michal Hocko <mhocko@...e.com> >> Cc: Wei Yang <richard.weiyang@...ux.alibaba.com> >> Cc: Baoquan He <bhe@...hat.com> >> Cc: Pankaj Gupta <pankaj.gupta.linux@...il.com> >> Cc: Oscar Salvador <osalvador@...e.de> >> Signed-off-by: David Hildenbrand <david@...hat.com> > >Reviewed-by: Oscar Salvador <osalvador@...e.de> > > >-- >Oscar Salvador >SUSE L3 -- Wei Yang Help you, Help me
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