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Re: [Xen-devel] [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically offline
- To: David Hildenbrand <david@xxxxxxxxxx>, linux-mm <linux-mm@xxxxxxxxx>
- From: Nadav Amit <namit@xxxxxxxxxx>
- Date: Wed, 14 Nov 2018 22:57:51 +0000
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- Cc: Michal Hocko <mhocko@xxxxxxxx>, "open list:DOCUMENTATION" <linux-doc@xxxxxxxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Omar Sandoval <osandov@xxxxxx>, Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, "Michael S. Tsirkin" <mst@xxxxxxxxxx>, Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, Alexey Dobriyan <adobriyan@xxxxxxxxx>, Len Brown <len.brown@xxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, "linux-pm@xxxxxxxxxxxxxxx" <linux-pm@xxxxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Julien Freche <jfreche@xxxxxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Kairui Song <kasong@xxxxxxxxxx>, Christian Hansen <chansen3@xxxxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Miles Chen <miles.chen@xxxxxxxxxxxx>, linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx>, "devel@xxxxxxxxxxxxxxxxxxxxxx" <devel@xxxxxxxxxxxxxxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
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- Thread-topic: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically offline
From: David Hildenbrand
Sent: November 14, 2018 at 9:16:58 PM GMT
> Subject: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically
> offline
>
>
> Right now, pages inflated as part of a balloon driver will be dumped
> by dump tools like makedumpfile. While XEN is able to check in the
> crash kernel whether a certain pfn is actuall backed by memory in the
> hypervisor (see xen_oldmem_pfn_is_ram) and optimize this case, dumps of
> virtio-balloon and hv-balloon inflated memory will essentially result in
> zero pages getting allocated by the hypervisor and the dump getting
> filled with this data.
Is there any reason that VMware balloon driver is not mentioned?
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