linux-kernel - Re: [mm-unstable v5 PATCH 0/7] Cleanup transhuge

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Date:   Fri, 17 Jun 2022 10:54:33 -0700
From:   Yang Shi <shy828301@...il.com>
To:     "Zach O'Keefe" <zokeefe@...gle.com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [mm-unstable v5 PATCH 0/7] Cleanup transhuge_xxx helpers

On Thu, Jun 16, 2022 at 4:08 PM Zach O'Keefe <zokeefe@...gle.com> wrote:
>
> On 16 Jun 10:48, Yang Shi wrote:
> >
> > v5: * Removed transparent_hugepage_active() for !THP, per Zach.
> >       Patch 4/7 and 5/7 were updated accordingly.
> >     * Collected review tags.
> > v4: * Consolidated the transhuge_vma_size_ok() helper proposed in the
> >       earlier versions into transhuge_vma_suitable(), per Zach.
> >     * Fixed the regression introduced by patch 3/7, per Zach and Miaohe.
> >     * Reworded the comment for transhuge_vma_suitable(), per Zach.
> >     * Removed khugepaged_enter() per Miaohe.
> >     * More comments for hugepage_vma_check(), per Zach.
> >     * Squashed patch 4/7 (mm: khugepaged: use transhuge_vma_suitable replace open-code)
> >       in the earlier version into patch 2/7 of this version.
> >     * Minor correction to the doc about THPeligible (patch 7/7), so the
> >       total number of patches is kept 7.
> > v3: * Fixed the comment from Willy
> > v2: * Rebased to the latest mm-unstable
> >     * Fixed potential regression for smaps's THPeligible
> >
> > This series is the follow-up of the discussion about cleaning up transhuge_xxx
> > helpers at https://lore.kernel.org/linux-mm/627a71f8-e879-69a5-ceb3-fc8d29d2f7f1@suse.cz/.
> >
> > THP has a bunch of helpers that do VMA sanity check for different paths, they
> > do the similar checks for the most callsites and have a lot duplicate codes.
> > And it is confusing what helpers should be used at what conditions.
> >
> > This series reorganized and cleaned up the code so that we could consolidate
> > all the checks into hugepage_vma_check().
> >
> > The transhuge_vma_enabled(), transparent_hugepage_active() and
> > __transparent_hugepage_enabled() are killed by this series.
> >
> >
> > Yang Shi (7):
> >       mm: khugepaged: check THP flag in hugepage_vma_check()
> >       mm: thp: consolidate vma size check to transhuge_vma_suitable
> >       mm: khugepaged: better comments for anon vma check in hugepage_vma_revalidate
> >       mm: thp: kill transparent_hugepage_active()
> >       mm: thp: kill __transhuge_page_enabled()
> >       mm: khugepaged: reorg some khugepaged helpers
> >       doc: proc: fix the description to THPeligible
> >
> >  Documentation/filesystems/proc.rst |  4 ++-
> >  fs/proc/task_mmu.c                 |  2 +-
> >  include/linux/huge_mm.h            | 80 +++++++++++++++++++----------------------------------------
> >  include/linux/khugepaged.h         | 30 ----------------------
> >  mm/huge_memory.c                   | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++--------
> >  mm/khugepaged.c                    | 84 +++++++++++++++++++-------------------------------------------
> >  mm/memory.c                        |  7 ++++--
> >  7 files changed, 130 insertions(+), 158 deletions(-)
> >
>
> Series LGTM. Thanks for these cleanups, Yang!

Thank you so much for reviewing the patches.

>
> Best,
> Zach