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One problem with the ->need_future_gp[] array is that the grace-period assignment of each element changes as the grace periods complete. This means that it is necessary to hold a lock when checking this array to learn if a given grace period has already been requested. This increase lock contention, which is the opposite of helpful. This commit therefore replaces the ->need_future_gp[] with a single ->gp_seq_needed value and keeps it updated in the rcu_data structure. This will enable reliable lockless checking of whether or not a given grace period has already been requested. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
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.