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9683937df9
Current rcuperf startup checks to see if the user asked to measure only expedited grace periods, yet constrained all grace periods to be normal, or if the user asked to measure only normal grace periods, yet constrained all grace periods to be expedited. Useless tests of this sort are aborted. Unfortunately, making RCU work through the mid-boot dead zone [1] puts RCU into expedited-only mode during that zone. Which happens to also be the exact time that rcuperf carries out the aforementioned check. So if the user asks rcuperf to measure only normal grace periods (the default), rcuperf will now always complain and terminate the test. This commit therefore moves the checks to rcu_perf_cleanup(). This has the disadvantage of failing to abort useless tests, but avoids the need to create yet another kthread and the need to do fiddly checks involving the holdoff time. (Yes, another approach is to do the checks in a late-stage init function, but that would require some way to communicate badness to rcuperf's kthreads, and seems not worth the bother.) [1] https://lwn.net/Articles/716148/ Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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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.