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A new module C6 Residency Counter is introduced in the Sierra Forest. The scope of the new counter is module (A cluster of cores shared L2 cache). Create a brand new cstate_module PMU to profile the new counter. The only differences between the new cstate_module PMU and the existing cstate PMU are the scope and events. Regarding the choice of the new cstate_module PMU name, the current naming rule of a cstate PMU is "cstate_" + the scope of the PMU. The scope of the PMU is the cores shared L2. On SRF, Intel calls it "module", while the internal Linux sched code calls it "cluster". The "cstate_module" is used as the new PMU name, because - The Cstate PMU driver is a Intel specific driver. It doesn't impact other ARCHs. The name makes it consistent with the documentation. - The "cluster" mainly be used by the scheduler developer, while the user of cstate PMU is more likely a researcher reading HW docs and optimizing power. - In the Intel's SDM, the "cluster" has a different meaning/scope for topology. Using it will mislead the end users. Besides the module C6, the core C1/C6 and pkg C6 residency counters are supported in the Sierra Forest as well. Suggested-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lore.kernel.org/r/20231116142245.1233485-3-kan.liang@linux.intel.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.
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.