From: David Hildenbrand <david@redhat.com>
To: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
Oscar Salvador <osalvador@suse.de>
Subject: Re: uninitialized pmem struct pages
Date: Mon, 4 Jan 2021 16:43:49 +0100 [thread overview]
Message-ID: <bf26f568-79b3-67f9-832a-9d8ef3f72c43@redhat.com> (raw)
In-Reply-To: <20210104153300.GL13207@dhcp22.suse.cz>
On 04.01.21 16:33, Michal Hocko wrote:
> On Mon 04-01-21 16:15:23, David Hildenbrand wrote:
>> On 04.01.21 16:10, Michal Hocko wrote:
> [...]
>> Do the physical addresses you see fall into the same section as boot
>> memory? Or what's around these addresses?
>
> Yes I am getting a garbage for the first struct page belonging to the
> pmem section [1]
> [ 0.020161] ACPI: SRAT: Node 0 PXM 0 [mem 0x100000000-0x603fffffff]
> [ 0.020163] ACPI: SRAT: Node 4 PXM 4 [mem 0x6060000000-0x11d5fffffff] non-volatile
>
> The pfn without the initialized struct page is 0x6060000. This is a
> first pfn in a section.
Okay, so we're not dealing with the "early section" mess I described,
different story.
Due to [1], is_mem_section_removable() called
pfn_to_page(PHYS_PFN(0x6060000)). page_zone(page) made it crash, as not
initialized.
Let's assume this is indeed a reserved pfn in the altmap. What's the
actual address of the memmap?
I do wonder what hosts pfn_to_page(PHYS_PFN(0x6060000)) - is it actually
part of the actual altmap (i.e. > 0x6060000) or maybe even self-hosted?
If it's not self-hosted, initializing the relevant memmaps should work
just fine I guess. Otherwise things get more complicated.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2021-01-04 15:43 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-04 10:03 Michal Hocko
2021-01-04 10:45 ` David Hildenbrand
2021-01-04 14:26 ` Michal Hocko
2021-01-04 14:51 ` David Hildenbrand
2021-01-04 15:10 ` Michal Hocko
2021-01-04 15:15 ` David Hildenbrand
2021-01-04 15:33 ` Michal Hocko
2021-01-04 15:43 ` David Hildenbrand [this message]
2021-01-04 15:44 ` David Hildenbrand
2021-01-05 8:00 ` Michal Hocko
2021-01-05 8:16 ` Michal Hocko
2021-01-05 8:27 ` Dan Williams
2021-01-05 8:42 ` Michal Hocko
2021-01-05 8:57 ` Dan Williams
2021-01-05 9:05 ` Michal Hocko
2021-01-05 9:13 ` David Hildenbrand
2021-01-05 9:25 ` Michal Hocko
2021-01-05 9:27 ` David Hildenbrand
2021-01-04 15:59 ` Michal Hocko
2021-01-04 16:30 ` David Hildenbrand
2021-01-05 7:44 ` Michal Hocko
2021-01-05 9:56 ` David Hildenbrand
2021-01-05 5:33 ` Dan Williams
2021-01-05 7:40 ` Michal Hocko
2021-01-05 5:17 ` Dan Williams
2021-01-05 7:50 ` Michal Hocko
2021-01-05 9:16 ` David Hildenbrand
2021-01-05 9:25 ` David Hildenbrand
2021-01-05 9:33 ` Dan Williams
2021-01-05 9:37 ` David Hildenbrand
2021-01-05 9:56 ` Dan Williams
2021-01-05 9:58 ` David Hildenbrand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=bf26f568-79b3-67f9-832a-9d8ef3f72c43@redhat.com \
--to=david@redhat.com \
--cc=dan.j.williams@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox