From: Michal Hocko <mhocko@kernel.org>
To: David Hildenbrand <david@redhat.com>
Cc: "Vlastimil Babka" <vbabka@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
"Andrew Morton" <akpm@linux-foundation.org>,
"Baoquan He" <bhe@redhat.com>, "Dave Young" <dyoung@redhat.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Hari Bathini" <hbathini@linux.vnet.ibm.com>,
"Huang Ying" <ying.huang@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Marc-André Lureau" <marcandre.lureau@redhat.com>,
"Matthew Wilcox" <mawilcox@microsoft.com>,
"Miles Chen" <miles.chen@mediatek.com>,
"Pavel Tatashin" <pasha.tatashin@oracle.com>,
"Petr Tesarik" <ptesarik@suse.cz>
Subject: Re: [PATCH v1 0/2] mm/kdump: exclude reserved pages in dumps
Date: Wed, 25 Jul 2018 15:51:47 +0200 [thread overview]
Message-ID: <20180725135147.GN28386@dhcp22.suse.cz> (raw)
In-Reply-To: <6c753cae-f8b6-5563-e5ba-7c1fefdeb74e@redhat.com>
On Tue 24-07-18 16:13:09, David Hildenbrand wrote:
[...]
> So I see right now:
>
> - Pg_reserved + e.g. new page type (or some other unique identifier in
> combination with Pg_reserved)
> -> Avoid reads of pages we know are offline
> - extend is_ram_page()
> -> Fake zero memory for pages we know are offline
>
> Or even both (avoid reading and don't crash the kernel if it is being done).
I really fail to see how that can work without kernel being aware of
PageOffline. What will/should happen if you run an old kdump tool on a
kernel with this partially offline memory?
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2018-07-25 13:51 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-20 12:34 [PATCH v1 0/2] mm/kdump: exclude reserved pages in dumps David Hildenbrand
2018-07-20 12:34 ` [PATCH v1 1/2] mm: clarify semantics of reserved pages David Hildenbrand
2018-07-23 10:48 ` Michal Hocko
2018-07-20 12:34 ` [PATCH v1 2/2] kdump: include PG_reserved value in VMCOREINFO David Hildenbrand
2018-07-23 11:45 ` [PATCH v1 0/2] mm/kdump: exclude reserved pages in dumps Vlastimil Babka
2018-07-23 12:30 ` Michal Hocko
2018-07-23 17:20 ` David Hildenbrand
2018-07-24 7:25 ` Michal Hocko
2018-07-24 8:46 ` David Hildenbrand
2018-07-24 8:53 ` Michal Hocko
2018-07-24 9:18 ` David Hildenbrand
2018-07-24 12:17 ` David Hildenbrand
2018-07-24 13:13 ` Michal Hocko
2018-07-24 13:27 ` David Hildenbrand
2018-07-24 13:35 ` Michal Hocko
2018-07-24 14:13 ` David Hildenbrand
2018-07-25 13:51 ` Michal Hocko [this message]
2018-07-25 14:20 ` David Hildenbrand
2018-07-26 8:27 ` Michal Hocko
2018-07-26 8:37 ` David Hildenbrand
2018-07-24 9:47 ` Vlastimil Babka
2018-07-24 11:19 ` Michal Hocko
2018-07-24 12:22 ` Vlastimil Babka
2018-07-24 12:33 ` David Hildenbrand
2018-07-24 13:06 ` Michal Hocko
2018-07-23 17:12 ` David Hildenbrand
2018-07-24 7:22 ` Michal Hocko
2018-07-24 9:48 ` Vlastimil Babka
2018-07-26 8:22 ` David Hildenbrand
2018-07-26 8:30 ` Michal Hocko
2018-07-26 8:45 ` David Hildenbrand
2018-07-26 19:50 ` Andrew Morton
2018-07-30 8:17 ` David Hildenbrand
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