linux-kernel - Re: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are logically offline

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Message-ID: <8932E1F4-A5A9-4462-9800-CAC1EF85AC5D@vmware.com>
Date:   Wed, 14 Nov 2018 22:57:51 +0000
From:   Nadav Amit <namit@...are.com>
To:     David Hildenbrand <david@...hat.com>, linux-mm <linux-mm@...ck.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        xen-devel <xen-devel@...ts.xenproject.org>,
        Alexander Duyck <alexander.h.duyck@...ux.intel.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>, Baoquan He <bhe@...hat.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Christian Hansen <chansen3@...co.com>,
        Dave Young <dyoung@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jonathan Corbet <corbet@....net>,
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        Kairui Song <kasong@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Len Brown <len.brown@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Miles Chen <miles.chen@...iatek.com>,
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        Omar Sandoval <osandov@...com>, Pavel Machek <pavel@....cz>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Julien Freche <jfreche@...are.com>
Subject: Re: [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?