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Since the PMU callback runs in irq context, it synchronizes with gt reset using the reset count. We could run into a case where the PMU callback could read the reset count before it is updated. This has a potential of corrupting the busyness stats. In addition to the reset count, check if the reset bit is set before capturing busyness. In addition save the previous stats only if you intend to update them. v2: - The 2 reset counts captured in the PMU callback can end up being the same if they were captured right after the count is incremented in the reset flow. This can lead to a bad busyness state. Ensure that reset is not in progress when the initial reset count is captured. Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: John Harrison <John.C.Harrison@Intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211108211057.68783-1-umesh.nerlige.ramappa@intel.com
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.