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Re: [Xen-devel] [PATCH RFC] mm/memory_hotplug: Introduce memory block types
- To: David Hildenbrand <david@xxxxxxxxxx>
- From: Michal Suchánek <msuchanek@xxxxxxx>
- Date: Thu, 4 Oct 2018 17:28:07 +0200
- Cc: Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxxxx>, linux-mm@xxxxxxxxx, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Rashmica Gupta <rashmica.g@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Michael Neuling <mikey@xxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Rob Herring <robh@xxxxxxxxxx>, Len Brown <lenb@xxxxxxxxxx>, Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, "mike.travis@xxxxxxx" <mike.travis@xxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Joe Perches <joe@xxxxxxxxxxx>, Jérôme Glisse <jglisse@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Oscar Salvador <osalvador@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Mathieu Malaterre <malat@xxxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Mauricio Faria de Oliveira <mauricfo@xxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Philippe Ombredanne <pombredanne@xxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, devel@xxxxxxxxxxxxxxxxxxxxxx, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- Delivery-date: Thu, 04 Oct 2018 15:35:16 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Thu, 4 Oct 2018 10:13:48 +0200
David Hildenbrand <david@xxxxxxxxxx> wrote:
ok, so what is the problem here?
Handling the hotplug in userspace through udev may be suboptimal and
kernel handling might be faster but that's orthogonal to the problem at
hand.
The state of the art is to determine what to do with hotplugged memory
in userspace based on platform and virtualization type.
Changing the default to depend on the driver that added the memory
rather than platform type should solve the issue of VMs growing
different types of memory device emulation.
Am I missing something?
Thanks
Michal
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