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2be4f05af7
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>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.