mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-03 20:34:23 -04:00
adcfe76c61
The purpose of jitter is to expose concurrency bugs due to invalid assumptions about forward progress. There is usually little point in jitter when measuring performance. This commit therefore defaults jitter off when running rcuperf. You can override this by specifying the kvm.sh "--jitter" argument -after- the "--torture rcuperf" argument. No idea why you would want this, but if you do, that is how you do it. One example of a conccurrency bug that this jitter might expose is one in which the developer assumed that a given short region of code would be guaranteed to execute within some short time limit. Such assumptions are invalid in virtualized environments because the hupervisor can preempt the guest OS at any point, even when the guest OS thinks that it has disabled interrupts. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.