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Re: [Xen-devel] [PATCH RFC] mm/memory_hotplug: Introduce memory block types
- To: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
- From: Michal Hocko <mhocko@xxxxxxxxxx>
- Date: Wed, 3 Oct 2018 16:24:44 +0200
- Cc: Kate Stewart <kstewart@xxxxxxxxxxxxxxxxxxx>, Rich Felker <dalias@xxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>, Balbir Singh <bsingharora@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, Heiko Carstens <heiko.carstens@xxxxxxxxxx>, linux-mm@xxxxxxxxx, Paul Mackerras <paulus@xxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Rashmica Gupta <rashmica.g@xxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, linux-s390@xxxxxxxxxxxxxxx, Michael Neuling <mikey@xxxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>, Michael Ellerman <mpe@xxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Len Brown <lenb@xxxxxxxxxx>, Pavel Tatashin <pavel.tatashin@xxxxxxxxxxxxx>, Rob Herring <robh@xxxxxxxxxx>, "mike.travis@xxxxxxx" <mike.travis@xxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Jonathan Neuschäfer <j.neuschaefer@xxxxxxx>, Nicholas Piggin <npiggin@xxxxxxxxx>, Martin Schwidefsky <schwidefsky@xxxxxxxxxx>, Jérôme Glisse <jglisse@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, 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>, Joe Perches <joe@xxxxxxxxxxx>, devel@xxxxxxxxxxxxxxxxxxxxxx, Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>, linuxppc-dev@xxxxxxxxxxxxxxxx, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
- Delivery-date: Wed, 03 Oct 2018 14:25:10 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed 03-10-18 15:52:24, Vitaly Kuznetsov wrote:
[...]
> > As David said some of the memory cannot be onlined without further steps
> > (e.g. when it is standby as David called it) and then I fail to see how
> > eBPF help in any way.
>
> and also, we can fight till the end of days here trying to come up with
> an onlining solution which would work for everyone and eBPF would move
> this decision to distro level.
The point is that there is _no_ general onlining solution. This is
basically policy which belongs to the userspace.
--
Michal Hocko
SUSE Labs
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