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Mainline Linux tree for various devices, only for fun :)
fd796e4139
By default, when lock contention is encountered, the RCU Tasks flavors of RCU switch to using per-CPU queueing. However, if the callback flood ends, per-CPU queueing continues to be used, which introduces significant additional overhead, especially for callback invocation, which fans out a series of workqueue handlers. This commit therefore switches back to single-queue operation if at the beginning of a grace period there are very few callbacks. The definition of "very few" is set by the rcupdate.rcu_task_collapse_lim module parameter, which defaults to 10. This switch happens in two phases, with the first phase causing future callbacks to be enqueued on CPU 0's queue, but with all queues continuing to be checked for grace periods and callback invocation. The second phase checks to see if an RCU grace period has elapsed and if all remaining RCU-Tasks callbacks are queued on CPU 0. If so, only CPU 0 is checked for future grace periods and callback operation. Of course, the return of contention anywhere during this process will result in returning to per-CPU callback queueing. Reported-by: Martin Lau <kafai@fb.com> Cc: Neeraj Upadhyay <neeraj.iitr10@gmail.com> Signed-off-by: Paul E. McKenney <paulmck@kernel.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
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| README | ||
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.