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faca5c2509
When there are excessive numbers of callbacks, and when either the corresponding no-CBs callback kthread is asleep or there is no more ready-to-invoke callbacks, and when least one callback is pending, __call_rcu_nocb_wake() will advance the callbacks, but refrain from awakening the corresponding no-CBs grace-period kthread. However, because rcu_advance_cbs_nowake() is used, it is possible (if a bit unlikely) that the needed advancement could not happen due to a grace period not being in progress. Plus there will always be at least one pending callback due to one having just now been enqueued. This commit therefore attempts to advance callbacks and awakens the no-CBs grace-period kthread when there are excessive numbers of callbacks posted and when the no-CBs callback kthread is not in a position to do anything helpful. Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com> |
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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.