Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps

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To: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Subject: Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Mon, 13 Feb 2023 19:01:28 +0100
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, linux-mm@xxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Naoya Horiguchi <naoya.horiguchi@xxxxxxxxx>, James Houghton <jthoughton@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Yang Shi <shy828301@xxxxxxxxx>, Vishal Moola <vishal.moola@xxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Muchun Song <songmuchun@xxxxxxxxxxxxx>, stable@xxxxxxxxxxxxxxx
In-reply-to: <Y91rhP+gT6me67M8@monkey>
References: <20230126222721.222195-2-mike.kravetz@oracle.com> <4ad5163f-5368-0bd8-de9b-1400a7a653ed@redhat.com> <20230127150411.7c3b7b99fa4884a6af0b9351@linux-foundation.org> <Y9R2ZXMxeF6Lpw4g@monkey> <Y9e56ofZ+E4buuam@dhcp22.suse.cz> <Y9g/70m15SwxkLfc@monkey> <Y9oY9850e/8LQ78i@dhcp22.suse.cz> <Y9rUHw2kuSwg2ntI@monkey> <Y90O5+UVYaaN1U3y@dhcp22.suse.cz> <Y91rhP+gT6me67M8@monkey>

On Fri 03-02-23 12:16:04, Mike Kravetz wrote:
[...]
> Unless someone thinks we should move forward, I will not push the code
> for this approach now.  It will also be interesting to see if this is
> impacted at all by the outcome of discussions to perhaps redesign
> mapcount.

Yes, I do agree. We might want to extend page_mapcount documentation a
bit though. The comment is explicit about the order-0 pages but a note
about hugetlb and pmd sharing wouldn't hurt. WDYT?
-- 
Michal Hocko
SUSE Labs

Follow-Ups:
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Mike Kravetz

References:
- [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Mike Kravetz
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: David Hildenbrand
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
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- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Mike Kravetz
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Michal Hocko
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Mike Kravetz
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Michal Hocko
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Mike Kravetz
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
  - From: Michal Hocko
- Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
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