linux-kernel - Re: [PATCH v1 10/15] mm/page-flags: reuse PG_slab as PG_anon

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Message-ID: <CAHk-=wiSNvb=0B=QzwCO7Xg6xZPJwe20p8ogsS=iOphkbNsKTw@mail.gmail.com>
Date:   Fri, 11 Mar 2022 11:49:30 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>,
        David Rientjes <rientjes@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        John Hubbard <jhubbard@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Yang Shi <shy828301@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Michal Hocko <mhocko@...nel.org>,
        Nadav Amit <namit@...are.com>, Rik van Riel <riel@...riel.com>,
        Roman Gushchin <guro@...com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Peter Xu <peterx@...hat.com>,
        Donald Dutile <ddutile@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Oleg Nesterov <oleg@...hat.com>, Jan Kara <jack@...e.cz>,
        Liang Zhang <zhangliang5@...wei.com>,
        Pedro Gomes <pedrodemargomes@...il.com>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v1 10/15] mm/page-flags: reuse PG_slab as
 PG_anon_exclusive for PageAnon() pages

On Fri, Mar 11, 2022 at 11:36 AM David Hildenbrand <david@...hat.com> wrote:
>
> Yes, but PG_has_hwpoisoned is located on the second subpage of a
> compound page, not on the head page.

Ahh. Ok, I missed that when just looking at the patch.

I wish we had a different namespace entirely for those separate bits
or something.

                  Linus