linux-kernel - Re: [PATCH 0/2] Fixes for hugetlb mapcount at most 1 for shared PMDs

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Message-ID: <Y9MDJuPWsk9820xD@x1n>
Date:   Thu, 26 Jan 2023 17:48:06 -0500
From:   Peter Xu <peterx@...hat.com>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        James Houghton <jthoughton@...gle.com>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>, Yang Shi <shy828301@...il.com>,
        Vishal Moola <vishal.moola@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Muchun Song <songmuchun@...edance.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/2] Fixes for hugetlb mapcount at most 1 for shared PMDs

On Thu, Jan 26, 2023 at 02:27:19PM -0800, Mike Kravetz wrote:
> This issue of mapcount in hugetlb pages referenced by shared PMDs was
> discussed in [1].  The following two patches address user visible
> behavior caused by this issue.
> 
> Patches apply to mm-stable as they can also target stable backports.
> 
> Ongoing folio conversions cause context conflicts in the second patch
> when applied to mm-unstable/linux-next.  I can create separate patch(es)
> if people agree with these.
> 
> [1] https://lore.kernel.org/linux-mm/Y9BF+OCdWnCSilEu@monkey/
> Mike Kravetz (2):
>   mm: hugetlb: proc: check for hugetlb shared PMD in /proc/PID/smaps
>   migrate: hugetlb: Check for hugetlb shared PMD in node migration

Acked-by: Peter Xu <peterx@...hat.com>

-- 
Peter Xu