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SubjectRe: [PATCH v1 0/2] mm/kdump: exclude reserved pages in dumps
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On 07/20/2018 02:34 PM, David Hildenbrand wrote:
> Dumping tools (like makedumpfile) right now don't exclude reserved pages.
> So reserved pages might be access by dump tools although nobody except
> the owner should touch them.

Are you sure about that? Or maybe I understand wrong. Maybe it changed
recently, but IIRC pages that are backing memmap (struct pages) are also
PG_reserved. And you definitely do want those in the dump.

> This is relevant in virtual environments where we soon might want to
> report certain reserved pages to the hypervisor and they might no longer
> be accessible - what already was documented for reserved pages a long
> time ago ("might not even exist").
>
> David Hildenbrand (2):
> mm: clarify semantics of reserved pages
> kdump: include PG_reserved value in VMCOREINFO
>
> include/linux/page-flags.h | 4 ++--
> kernel/crash_core.c | 1 +
> 2 files changed, 3 insertions(+), 2 deletions(-)
>

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