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8c42b1f39f
There is a two-jiffy delay between the time that a CPU will self-report an RCU CPU stall warning and the time that some other CPU will report a warning on behalf of the first CPU. This has worked well in the past, but on busy systems, it is possible for the two warnings to overlap, which makes interpreting them extremely difficult. This commit therefore uses a cmpxchg-based timing decision that allows only one report in a given one-minute period (assuming default stall-warning Kconfig parameters). This approach will of course fail if you are seeing minute-long vCPU preemption, but in that case the overlapping RCU CPU stall warnings are the least of your worries. Reported-by: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> |
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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.
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.