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On HWP platforms with Turbo 3.0, the HWP capability max ratio shows the maximum ratio of that core, which can be different than other cores. If we show the correct maximum frequency in cpufreq sysfs via cpuinfo_max_freq and scaling_max_freq then, user can know which cores can run faster for pinning some high priority tasks. Currently the max turbo frequency is shown as max frequency, which is the max of all cores, even if some cores can't reach that frequency even for single threaded workload. But it is possible that max ratio in HWP capabilities is set as 0xFF or some high invalid value (E.g. One KBL NUC). Since the actual performance can never exceed 1 core turbo frequency from MSR TURBO_RATIO_LIMIT, we use this as a bound check. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| drivers | ||
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| include | ||
| init | ||
| ipc | ||
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| lib | ||
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| .clang-format | ||
| .cocciconfig | ||
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| COPYING | ||
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| Makefile | ||
| 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.