linux-kernel - Re: [PATCH v3 1/4] mm: Non-pmd-mappable, large folios for folio_add_new_anon

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Date:   Fri, 14 Jul 2023 10:52:01 -0600
From:   Yu Zhao <yuzhao@...gle.com>
To:     Ryan Roberts <ryan.roberts@....com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Yin Fengwei <fengwei.yin@...el.com>,
        David Hildenbrand <david@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Yang Shi <shy828301@...il.com>,
        "Huang, Ying" <ying.huang@...el.com>, Zi Yan <ziy@...dia.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v3 1/4] mm: Non-pmd-mappable, large folios for folio_add_new_anon_rmap()

On Fri, Jul 14, 2023 at 10:17 AM Ryan Roberts <ryan.roberts@....com> wrote:
>
> In preparation for FLEXIBLE_THP support, improve
> folio_add_new_anon_rmap() to allow a non-pmd-mappable, large folio to be
> passed to it. In this case, all contained pages are accounted using the
> order-0 folio (or base page) scheme.
>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> Reviewed-by: Yu Zhao <yuzhao@...gle.com>
> Reviewed-by: Yin Fengwei <fengwei.yin@...el.com>

This patch doesn't depend on the rest of the series and therefore can
be merged separately in case the rest needs more discussion.

Ryan, please feel free to post other code paths (those from v1) you've
optimized for large anon folios at any time, since each code path can
be reviewed and merged individually as well.