From: osalvador@suse.de
To: Michal Hocko <mhocko@kernel.org>
Cc: akpm@linux-foundation.org, dan.j.williams@intel.com,
pavel.tatashin@microsoft.com, jglisse@redhat.com,
Jonathan.Cameron@huawei.com, rafael@kernel.org, david@redhat.com,
linux-mm@kvack.org, owner-linux-mm@kvack.org
Subject: Re: [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span
Date: Wed, 28 Nov 2018 13:51:42 +0100 [thread overview]
Message-ID: <ddd7474af7162dcfa3ce328587b4a916@suse.de> (raw)
In-Reply-To: <20181128123120.GJ6923@dhcp22.suse.cz>
> yep. Or when we extend a zone/node via hotplug.
>
>> The only thing I am worried about is that by doing that, the system
>> will account spanned_pages incorrectly.
>
> As long as end_pfn - start_pfn matches then I do not see what would be
> incorrect.
If by end_pfn - start_pfn you mean zone_end_pfn - zone_start_pfn,
then we would still need to change zone_start_pfn when removing
the first section, and adjust spanned_pages in case we remove the last
section,
would not we?
Let us say we have a zone with 3 sections:
zone_start_pfn = 0
zone_end_pfn = 98304
If we hot-remove the last section, zone_end_pfn should be adjusted to
65536.
Otherwise zone_end_pfn - zone_start_pfn will give us more.
The same goes when we hot-remove the first section.
Of course, we should not care when removing a section which is not
either
the first one or the last one.
Having said that, I will check the uses we have for spanned_pages.
next prev parent reply other threads:[~2018-11-28 12:51 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-27 16:20 [PATCH v2 0/5] Do not touch pages in hot-remove path Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 1/5] mm, memory_hotplug: Add nid parameter to arch_remove_memory Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 2/5] kernel, resource: Check for IORESOURCE_SYSRAM in release_mem_region_adjustable Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 3/5] mm, memory_hotplug: Move zone/pages handling to offline stage Oscar Salvador
2018-11-28 7:52 ` Mike Rapoport
2018-11-28 14:25 ` osalvador
2018-11-28 14:15 ` osalvador
2018-11-27 16:20 ` [PATCH v2 4/5] mm, memory-hotplug: Rework unregister_mem_sect_under_nodes Oscar Salvador
2019-03-24 6:48 ` Anshuman Khandual
2019-03-25 7:40 ` Oscar Salvador
2019-03-25 8:04 ` Michal Hocko
2019-03-25 8:14 ` Oscar Salvador
2018-11-27 16:20 ` [PATCH v2 5/5] mm, memory_hotplug: Refactor shrink_zone/pgdat_span Oscar Salvador
2018-11-28 6:50 ` Michal Hocko
2018-11-28 7:07 ` Oscar Salvador
2018-11-28 10:03 ` David Hildenbrand
2018-11-28 10:14 ` Michal Hocko
2018-11-28 11:00 ` osalvador
2018-11-28 12:31 ` Michal Hocko
2018-11-28 12:51 ` osalvador [this message]
2018-11-28 13:08 ` Michal Hocko
2018-11-28 13:18 ` osalvador
2018-11-28 15:50 ` Michal Hocko
2018-11-28 16:02 ` osalvador
2018-11-29 9:29 ` osalvador
2018-11-28 13:09 ` osalvador
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=ddd7474af7162dcfa3ce328587b4a916@suse.de \
--to=osalvador@suse.de \
--cc=Jonathan.Cameron@huawei.com \
--cc=akpm@linux-foundation.org \
--cc=dan.j.williams@intel.com \
--cc=david@redhat.com \
--cc=jglisse@redhat.com \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=owner-linux-mm@kvack.org \
--cc=pavel.tatashin@microsoft.com \
--cc=rafael@kernel.org \
/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;
as well as URLs for NNTP newsgroup(s).