diff options
| author | Chuck Lever <chuck.lever@oracle.com> | 2023-07-25 14:31:04 -0400 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-08-09 09:15:41 +0200 |
| commit | 2be4f05af71bb2a9958c5680c19e5a489636ff42 (patch) | |
| tree | 422fc12ee546561b1ccf87b66842201799e43f69 /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | bbaef7973dd017954419718ab2df526ae1f66e93 (diff) | |
libfs: Remove parent dentry locking in offset_iterate_dir()
Since offset_iterate_dir() does not walk the parent's d_subdir list
nor does it manipulate the parent's d_child, there doesn't seem to
be a reason to hold the parent's d_lock. The offset_ctx's xarray can
be sufficiently protected with just the RCU read lock.
Flame graph data captured during the git regression run shows a
20% reduction in CPU cycles consumed in offset_find_next().
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202307171640.e299f8d5-oliver.sang@intel.com
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Message-Id: <169030957098.157536.9938425508695693348.stgit@manet.1015granger.net>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions