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[2003:dc:6f45:eb00:230:64ff:fe74:809]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4606f26f1cdsm7807377f8f.11.2026.06.12.09.52.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Jun 2026 09:52:16 -0700 (PDT) From: Max Kellermann To: idryomov@gmail.com, amarkuze@redhat.com, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Max Kellermann Subject: [PATCH 00/12] fs/ceph: optimize struct layouts Date: Fri, 12 Jun 2026 18:51:52 +0200 Message-ID: <20260612165204.86137-1-max.kellermann@ionos.com> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch set aims to reduce the memory usage of the Ceph filesystems by optimizing the layout of structs, most importantly struct ceph_inode_info: - use `bool` instead of `int` for booelans - use `u32` instead of `u64` where possible - reorder fields to eliminate padding holes - eliminate redundant fields Without this patch set, ceph_inode_info looks like this with pahole: /* size: 1456, cachelines: 23, members: 78 */ /* sum members: 1424, holes: 8, sum holes: 32 */ /* member types with holes: 4, total: 4 */ With this patch set, struct ceph_inode_info got smaller by 96 bytes: /* size: 1360, cachelines: 22, members: 75 */ /* member types with holes: 2, total: 2 */ Max Kellermann (12): fs/ceph/super: remove unused field `i_cap_migration_resv` fs/ceph/super: make field `i_truncate_pagecache_size` optional include/ceph/ceph_fs.h: convert `pool_id` to u32 fs/ceph/super.h: convert ceph_inode_xattr fields to `bool` fs/ceph/super.h: convert ceph_cap_snap.writing fields to `bool` fs/ceph: consistently use `u32` for `time_warp_seq` fs/ceph/super: reorder fields to eliminate padding holes fs/ceph: remove i_truncate_mutex, use i_fragtree_mutex for both fs/ceph/super.h: add `const` to helpers fs/ceph/super.h: add helper ceph_in_snap() fs/ceph: use ceph_vino() etc. instead of accessing i_vino directly fs/ceph: remove redundant inode number from ceph_inode_info fs/ceph/acl.c | 2 +- fs/ceph/addr.c | 23 ++++---- fs/ceph/cache.c | 4 +- fs/ceph/caps.c | 8 +-- fs/ceph/dir.c | 20 +++---- fs/ceph/export.c | 8 +-- fs/ceph/file.c | 28 +++++----- fs/ceph/inode.c | 38 ++++++++----- fs/ceph/mds_client.c | 12 ++--- fs/ceph/mds_client.h | 2 +- fs/ceph/quota.c | 6 +-- fs/ceph/snap.c | 8 +-- fs/ceph/super.h | 102 +++++++++++++++++++++++++---------- fs/ceph/util.c | 8 +-- fs/ceph/xattr.c | 18 +++---- include/linux/ceph/ceph_fs.h | 2 +- 16 files changed, 171 insertions(+), 118 deletions(-) -- 2.47.3