linux-kernel - Re: [PATCH v2 07/12] s390: add pte_free

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Message-ID: <ZKQhW2aHJHsnkJhv@li-008a6a4c-3549-11b2-a85c-c5cc2836eea2.ibm.com>
Date:   Tue, 4 Jul 2023 15:40:43 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Hugh Dickins <hughd@...gle.com>
Cc:     Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        David Hildenbrand <david@...hat.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Qi Zheng <zhengqi.arch@...edance.com>,
        Yang Shi <shy828301@...il.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Peter Xu <peterx@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Alistair Popple <apopple@...dia.com>,
        Ralph Campbell <rcampbell@...dia.com>,
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        Steven Price <steven.price@....com>,
        SeongJae Park <sj@...nel.org>,
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        Song Liu <song@...nel.org>,
        Thomas Hellstrom <thomas.hellstrom@...ux.intel.com>,
        Russell King <linux@...linux.org.uk>,
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        Vishal Moola <vishal.moola@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        linux-arm-kernel@...ts.infradead.org, sparclinux@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH v2 07/12] s390: add pte_free_defer() for pgtables sharing
 page

On Sat, Jul 01, 2023 at 09:32:38PM -0700, Hugh Dickins wrote:
> On Thu, 29 Jun 2023, Hugh Dickins wrote:

Hi Hugh,

...
> No, not quite the same rules as before: I came to realize that using
> list_add_tail() for the HH pages would be liable to put a page on the
> list which forever blocked reuse of PP list_add_tail() pages after it
> (could be solved by a list_move() somewhere, but we have agreed to
> prefer simplicity).

Just to make things more clear for me: do I understand correctly that this
was an attempt to add HH fragments to pgtable_list from pte_free_defer()?

Thanks!