Changes since v1: - Remove kernfs_rwsem from kernfs_notify_workfn - Include Matthew's "Reviewed-by" tag for Patch-3 ------------------------------------------------------------------- Original cover letter This change set is consolidating the changes discussed and/or mentioned in [1] and [2]. I have not received any feedback about any of the patches included in this change set, so I am rebasing them on current linux-next tip and bringing them all in one place. As mentioned in [1], since changing per-fs kernfs_rwsem into a hashed rwsem is not working for all scenarios, PATCH-1 here tries to address the same issue with the help of another newly introduced per-fs rwsem. PATCH-2 and PATCH-3 are basically resend of PATCH-1 and PATCH-2 respectively in [2]. It would be really helpful if I could get some feedback about this changeset so that we can reduce the kernfs_rwsem contention and make sysfs access more scalable for large-scale systems. The patches in this change set are as follows: PATCH-1: kernfs: Introduce separate rwsem to protect inode attributes. PATCH-2: kernfs: Use a per-fs rwsem to protect per-fs list of kernfs_super_info. PATCH-3: kernfs: change kernfs_rename_lock into a read-write lock. Imran Khan (3): kernfs: Introduce separate rwsem to protect inode attributes. Use a per-fs rwsem to protect per-fs list of kernfs_super_info. kernfs: change kernfs_rename_lock into a read-write lock. fs/kernfs/dir.c | 26 +++++++++++++++++--------- fs/kernfs/file.c | 2 ++ fs/kernfs/inode.c | 16 ++++++++-------- fs/kernfs/kernfs-internal.h | 2 ++ fs/kernfs/mount.c | 8 ++++---- 5 files changed, 33 insertions(+), 21 deletions(-) base-commit: 7f7a8831520f12a3cf894b0627641fad33971221 [1]:https://lore.kernel.org/all/74969b22-e0b6-30bd-a1f0-132f4b8485cf@xxxxxxxxxx/ [2]:https://lore.kernel.org/all/20220810111017.2267160-1-imran.f.khan@xxxxxxxxxx/ ------------------------------------------------------------------- Imran Khan (3): kernfs: Introduce separate rwsem to protect inode attributes. kernfs: Use a per-fs rwsem to protect per-fs list of kernfs_super_info. kernfs: change kernfs_rename_lock into a read-write lock. fs/kernfs/dir.c | 26 +++++++++++++++++--------- fs/kernfs/file.c | 4 ++-- fs/kernfs/inode.c | 16 ++++++++-------- fs/kernfs/kernfs-internal.h | 2 ++ fs/kernfs/mount.c | 8 ++++---- 5 files changed, 33 insertions(+), 23 deletions(-) -- 2.34.1
