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Currently, readers are awakened individually. On most systems, this results in significant wakeup delay from one reader to the next, which can result in the first and last reader having sole access to the synchronization primitive in question. If that synchronization primitive involves shared memory, those readers will rack up a huge number of operations in a very short time, causing large perturbations in the results. This commit therefore has the readers busy-wait after being awakened, and uses a new n_started variable to synchronize their start times. Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Signed-off-by: Paul E. McKenney <paulmck@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.