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ab5e869c1f
This commit makes rcu_nocb_wait_gp() check rdp->gp_seq_needed to see if the current CPU already knows about the needed grace period having already been requested. If so, it avoids acquiring the corresponding leaf rcu_node structure's ->lock, thus decreasing contention. This optimization is intended for cases where either multiple leader rcuo kthreads are running on the same CPU or these kthreads are running on a non-offloaded (e.g., housekeeping) CPU. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> [ paulmck: Move lock release past "if" as suggested by Joel Fernandes. ] [ paulmck: Fix caching of furthest-future requested grace period. ]
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.