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[78.0.206.107]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd66888cc7sm43753377b3.44.2026.05.03.20.59.49 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 May 2026 20:59:53 -0700 (PDT) Message-ID: <78324cb0-fe12-4f45-85d8-557e2a7649cf@redhat.com> Date: Sun, 3 May 2026 22:00:25 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 04/14] mm/khugepaged: remove READ_ONLY_THP_FOR_FS check in hugepage_enabled() To: Zi Yan , Andrew Morton , David Hildenbrand , "Matthew Wilcox (Oracle)" , Song Liu Cc: Chris Mason , David Sterba , Alexander Viro , Christian Brauner , Jan Kara , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20260429152924.727124-1-ziy@nvidia.com> <20260429152924.727124-5-ziy@nvidia.com> Content-Language: en-US From: Nico Pache In-Reply-To: <20260429152924.727124-5-ziy@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/29/26 9:29 AM, Zi Yan wrote: > Remove the READ_ONLY_THP_FOR_FS gate and khugepaged for file-backed > pmd-sized hugepages are enabled by the global transparent hugepage control. > khugepaged can still be enabled by per-size control for anon and shmem when > the global control is off. > > Add shmem_hpage_pmd_enabled() stub for !CONFIG_SHMEM to remove > IS_ENABLED(SHMEM) in hugepage_enabled(). > > Clean up hugepage_enabled() by moving anon code to anon_hpage_enabled(). Thank you for cleaning that up! Reviewed-by: Nico Pache > > Signed-off-by: Zi Yan > Reviewed-by: Baolin Wang > Acked-by: David Hildenbrand (Arm) > --- > include/linux/shmem_fs.h | 2 +- > mm/khugepaged.c | 26 ++++++++++++++++---------- > 2 files changed, 17 insertions(+), 11 deletions(-) > > diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h > index 93a0ba872ebe0..acb8dd961b45c 100644 > --- a/include/linux/shmem_fs.h > +++ b/include/linux/shmem_fs.h > @@ -127,7 +127,7 @@ int shmem_writeout(struct folio *folio, struct swap_iocb **plug, > void shmem_truncate_range(struct inode *inode, loff_t start, uoff_t end); > int shmem_unuse(unsigned int type); > > -#ifdef CONFIG_TRANSPARENT_HUGEPAGE > +#if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_SHMEM) > unsigned long shmem_allowable_huge_orders(struct inode *inode, > struct vm_area_struct *vma, pgoff_t index, > loff_t write_end, bool shmem_huge_force); > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index 71209a72195ab..d6971ada8f199 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -524,26 +524,32 @@ static inline int collapse_test_exit_or_disable(struct mm_struct *mm) > mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm); > } > > +static inline bool anon_hpage_enabled(void) > +{ > + if (READ_ONCE(huge_anon_orders_always)) > + return true; > + if (READ_ONCE(huge_anon_orders_madvise)) > + return true; > + if (READ_ONCE(huge_anon_orders_inherit) && > + hugepage_global_enabled()) > + return true; > + return false; > +} > + > static bool hugepage_enabled(void) > { > /* > * We cover the anon, shmem and the file-backed case here; file-backed > - * hugepages, when configured in, are determined by the global control. > + * hugepages are determined by the global control. > * Anon hugepages are determined by its per-size mTHP control. > * Shmem pmd-sized hugepages are also determined by its pmd-size control, > * except when the global shmem_huge is set to SHMEM_HUGE_DENY. > */ > - if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && > - hugepage_global_enabled()) > - return true; > - if (READ_ONCE(huge_anon_orders_always)) > + if (hugepage_global_enabled()) > return true; > - if (READ_ONCE(huge_anon_orders_madvise)) > - return true; > - if (READ_ONCE(huge_anon_orders_inherit) && > - hugepage_global_enabled()) > + if (anon_hpage_enabled()) > return true; > - if (IS_ENABLED(CONFIG_SHMEM) && shmem_hpage_pmd_enabled()) > + if (shmem_hpage_pmd_enabled()) > return true; > return false; > }