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Subject: Re: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are
 logically offline
Thread-Topic: [PATCH RFC 0/6] mm/kdump: allow to exclude pages that are
 logically offline
Thread-Index: AQHUfG14AtUUXm8lq0WDadIpB+L9nQ==
Date:   Wed, 14 Nov 2018 22:57:51 +0000
Message-ID: <8932E1F4-A5A9-4462-9800-CAC1EF85AC5D@vmware.com>
References: <20181114211704.6381-1-david@redhat.com>
In-Reply-To: <20181114211704.6381-1-david@redhat.com>
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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 logica=
lly offline
>=20
>=20
> 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?