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20ecf595b5
The rseq test's migration worker delays 1-10 us, assuming that one KVM_RUN iteration only takes a few microseconds. But if the CPU low power wakeup latency is large enough, for example, hundreds or even thousands of microseconds for deep C-state exit latencies on x86 server CPUs, it may happen that the target CPU is unable to wakeup and run the vCPU before the migration worker starts to migrate the vCPU thread to the _next_ CPU. If the system workload is light, most CPUs could be at a certain low power state, which may result in less successful migrations and fail the migration/KVM_RUN ratio sanity check. But this is not supposed to be deemed a test failure. Add a command line option to skip the sanity check, along with a comment and a verbose assert message to try to help the user resolve the potential source of failures without having to resort to disabling the check. Co-developed-by: Dongsheng Zhang <dongsheng.x.zhang@intel.com> Signed-off-by: Dongsheng Zhang <dongsheng.x.zhang@intel.com> Signed-off-by: Zide Chen <zide.chen@intel.com> Link: https://lore.kernel.org/r/20240502213936.27619-1-zide.chen@intel.com [sean: massage changelog] Signed-off-by: Sean Christopherson <seanjc@google.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 reStructuredText 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.