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[78.0.206.107]) by smtp.gmail.com with ESMTPSA id 00721157ae682-7bd6654e464sm44532247b3.14.2026.05.03.21.11.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 03 May 2026 21:11:14 -0700 (PDT) Message-ID: <1f3aedf7-9e48-4650-a7e2-5584c8b299c7@redhat.com> Date: Sun, 3 May 2026 22:11:46 -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 07/14] fs: remove nr_thps from struct address_space 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> <20260429153538.727855-3-ziy@nvidia.com> Content-Language: en-US From: Nico Pache In-Reply-To: <20260429153538.727855-3-ziy@nvidia.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 4/29/26 9:35 AM, Zi Yan wrote: > filemap_nr_thps*() are removed, the related field, address_space->nr_thps, > is no longer needed. Remove it. This shrinks struct address_space by 8 > bytes on 64-bit systems which may increase the number of inodes we can > cache. We've had performance impacts in the past by changing the alignment of certain structs. This is a rather critical one. Ill keep an eye out for any performance differences noted by our PerfQE team surrounding this feature. LGTM! Reviewed-by: Nico Pache > > Signed-off-by: Zi Yan > Reviewed-by: Lorenzo Stoakes (Oracle) > Acked-by: David Hildenbrand (Arm) > Reviewed-by: Lance Yang > Reviewed-by: Matthew Wilcox (Oracle) > Reviewed-by: Baolin Wang > --- > fs/inode.c | 3 --- > include/linux/fs.h | 5 ----- > 2 files changed, 8 deletions(-) > > diff --git a/fs/inode.c b/fs/inode.c > index 6a3cbc7dcd28c..d8a6d6266c3c3 100644 > --- a/fs/inode.c > +++ b/fs/inode.c > @@ -279,9 +279,6 @@ int inode_init_always_gfp(struct super_block *sb, struct inode *inode, gfp_t gfp > mapping->flags = 0; > mapping->wb_err = 0; > atomic_set(&mapping->i_mmap_writable, 0); > -#ifdef CONFIG_READ_ONLY_THP_FOR_FS > - atomic_set(&mapping->nr_thps, 0); > -#endif > mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); > mapping->writeback_index = 0; > init_rwsem(&mapping->invalidate_lock); > diff --git a/include/linux/fs.h b/include/linux/fs.h > index 11559c513dfbb..bb9cc4f7207c1 100644 > --- a/include/linux/fs.h > +++ b/include/linux/fs.h > @@ -460,7 +460,6 @@ struct mapping_metadata_bhs { > * memory mappings. > * @gfp_mask: Memory allocation flags to use for allocating pages. > * @i_mmap_writable: Number of VM_SHARED, VM_MAYWRITE mappings. > - * @nr_thps: Number of THPs in the pagecache (non-shmem only). > * @i_mmap: Tree of private and shared mappings. > * @i_mmap_rwsem: Protects @i_mmap and @i_mmap_writable. > * @nrpages: Number of page entries, protected by the i_pages lock. > @@ -476,10 +475,6 @@ struct address_space { > struct rw_semaphore invalidate_lock; > gfp_t gfp_mask; > atomic_t i_mmap_writable; > -#ifdef CONFIG_READ_ONLY_THP_FOR_FS > - /* number of thp, only for non-shmem files */ > - atomic_t nr_thps; > -#endif > struct rb_root_cached i_mmap; > unsigned long nrpages; > pgoff_t writeback_index;