linux-kernel - Re: [PATCH v1 00/10] variable-order, large folios for anonymous memory

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Message-ID: <CAOUHufbC76OdP16mRsY3i920qB7khcu8FM+nUOG0kx5BMRdKXw@mail.gmail.com>
Date:   Wed, 28 Jun 2023 18:27:34 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Yin Fengwei <fengwei.yin@...el.com>
Cc:     Ryan Roberts <ryan.roberts@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-alpha@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-s390@...r.kernel.org
Subject: Re: [PATCH v1 00/10] variable-order, large folios for anonymous memory

On Wed, Jun 28, 2023 at 5:59 PM Yin Fengwei <fengwei.yin@...el.com> wrote:
>
> Hi Yu,
>
> On 6/29/23 02:22, Yu Zhao wrote:
> > And please make sure it's disabled by default, because we are still
> > missing many important functions, e.g., I don't think we can mlock()
> > when large() && !pmd_mappable(), see mlock_pte_range() and
> > mlock_vma_folio(). We can fix it along with many things later, but we
> > need to present a plan and a schedule now. Otherwise, there would be
> > pushback if we try to land the series without supporting mlock().
> >
> > Do you or Fengwei plan to take on it? (I personally don't.) If not,
> Do you mean the mlock() with large folio? Yes. I can work on it. Thanks.

Great. Thanks!

Other places that have the similar problem but are probably easier to
fix than the mlock() case:
* madvise_cold_or_pageout_pte_range()
* shrink_folio_list()