Messages in this thread | | | From | Imran Khan <> | Subject | [PATCH v3 0/2] kernfs: use hashed mutex and spinlock in place of global ones | Date | Thu, 13 Jan 2022 21:42:57 +1100 |
| |
Reduce contention around global locks used in kernfs.
PATCH-1: Make global kernfs_open_file_mutex and kernfs_open_node_lock hashed locks, where address of a kernfs_node acts as hash key. This results in kernfs_node objects, whose address give the different hash value, using different kernfs_open_file_mutex and kernfs_open_node_lock rather than all kernfs_node objects using the same kernfs_open_file_mutex and kernfs_open_node_lock as was the case earlier.
PATCH-2: Use a hashed rw_semaphore to access permissions, so that we can avoid contention around global per-fs rw_semaphore, seen if multiple applications are executing inode_permission and walk_component in parallel when trying to open sysfs file(s).
------------------------------------------------------------------
Changes since v2: - Remove RFC tag - Use hashed locks rather than using per kernfs_node specific lock (Suggested by Tejun Heo <tj@kernel.org>)
Imran Khan (2): kernfs: use hashed mutex and spinlock in place of global ones. kernfs: Reduce contention around global per-fs kernfs_rwsem.
fs/kernfs/dir.c | 8 +++++ fs/kernfs/file.c | 65 ++++++++++++++++----------------- fs/kernfs/inode.c | 35 ++++++++++++------ fs/kernfs/kernfs-internal.h | 71 +++++++++++++++++++++++++++++++++++++ fs/kernfs/mount.c | 11 ++++++ 5 files changed, 146 insertions(+), 44 deletions(-)
base-commit: a70bf4a85b43cb952bd39dd948b103b1b3eb2cf8 -- 2.30.2
| |