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

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Message-ID: <Yqu392qcUSp1imEi@google.com>
Date:   Thu, 16 Jun 2022 16:08:39 -0700
From:   Zach O'Keefe <zokeefe@...gle.com>
To:     Yang Shi <shy828301@...il.com>
Cc:     vbabka@...e.cz, kirill.shutemov@...ux.intel.com,
        willy@...radead.org, linmiaohe@...wei.com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [mm-unstable v5 PATCH 0/7] Cleanup transhuge_xxx helpers

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!

Best,
Zach