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PowerVM Hypervisor dispatches on a whole core basis. In a shared LPAR, a CPU from a core that is CEDED or preempted may have a larger latency. In such a scenario, its preferable to choose a different CPU to run. If one of the CPUs in the core is active, i.e neither CEDED nor preempted, then consider this CPU as not preempted. Also if any of the CPUs in the core has yielded but OS has not requested CEDE or CONFER, then consider this CPU to be preempted. Correct detection of preempted CPUs is important for detecting idle CPUs/cores in task scheduler. Tested-by: Aboorva Devarajan <aboorvad@linux.vnet.ibm.com> Reviewed-by: Shrikanth Hegde <sshegde@linux.vnet.ibm.com> Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20231019091452.95260-1-srikar@linux.vnet.ibm.com |
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| include | ||
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| ipc | ||
| kernel | ||
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| .clang-format | ||
| .cocciconfig | ||
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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.
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.