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

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Message-ID: <Y+p6+AKN7jY2jzJN@dhcp22.suse.cz>
Date:   Mon, 13 Feb 2023 19:01:28 +0100
From:   Michal Hocko <mhocko@...e.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        James Houghton <jthoughton@...gle.com>,
        Peter Xu <peterx@...hat.com>, Yang Shi <shy828301@...il.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Muchun Song <songmuchun@...edance.com>, stable@...r.kernel.org
Subject: Re: [PATCH 1/2] mm: hugetlb: proc: check for hugetlb shared PMD in
 /proc/PID/smaps

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