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

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Date:   Thu, 29 Jun 2023 08:31:00 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     Yu Zhao <yuzhao@...gle.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 6/29/23 08:27, Yu Zhao wrote:
> 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()
This one was on my radar. :). 

Regards
Yin, Fengwei

> * shrink_folio_list()