575024a8aa
Introduce two new APIs rapl_package_add_pmu()/rapl_package_remove_pmu(). RAPL driver can invoke these APIs to expose its supported energy counters via perf PMU. The new RAPL PMU is fully compatible with current MSR RAPL PMU, including using the same PMU name and events name/id/unit/scale, etc. For example, use below command perf stat -e power/energy-pkg/ -e power/energy-ram/ FOO to get the energy consumption if power/energy-pkg/ and power/energy-ram/ events are available in the "perf list" output. This does not introduce any conflict because TPMI RAPL is the only user of these APIs currently, and it never co-exists with MSR RAPL. Note that RAPL Packages can be probed/removed dynamically, and the events supported by each TPMI RAPL device can be different. Thus the RAPL PMU support is done on demand, which means 1. PMU is registered only if it is needed by a RAPL Package. PMU events for unsupported counters are not exposed. 2. PMU is unregistered and registered when a new RAPL Package is probed and supports new counters that are not supported by current PMU. For example, on a dual-package system using TPMI RAPL, it is possible that Package 1 behaves as TPMI domain root and supports Psys domain. In this case, register PMU without Psys event when probing Package 0, and re-register the PMU with Psys event when probing Package 1. 3. PMU is unregistered when all registered RAPL Packages don't need PMU. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| 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 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.