Messages in this thread | | | Subject | Re: [PATCH v1 0/2] mm/kdump: exclude reserved pages in dumps | From | Vlastimil Babka <> | Date | Mon, 23 Jul 2018 13:45:18 +0200 |
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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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