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The legacy-hardware.json is added containing hardware events similarly to the software.json file. A difference is that for the software PMU the name is known and matches sysfs. In the legacy-hardware.json no Unit/PMU is specified for the events meaning default_core is used and the events will appear for all core PMUs. There are potentially 1216 legacy cache events, rather than list them in a json file add a make_legacy_cache.py helper to generate them. By using json for legacy hardware and cache events: descriptions of the events can be added; events can be marked as deprecated, such as those misleadingly named l2 (deprecated is also used to mark all events that weren't previously displayed in perf list); and the name lookup becomes case insensitive. The C string encoding all the perf events and metrics is increased in size by 123,499 bytes which will increase the perf binary size. Later changes will remove hard coded event parsing for legacy hardware and cache events, turning parsing overhead into a binary search during event lookup. That event descriptions are based off of those in perf_event_open man page, credit to Vince Weaver <vincent.weaver@maine.edu>. Tested-by: Thomas Richter <tmricht@linux.ibm.com> Signed-off-by: Ian Rogers <irogers@google.com> Tested-by: James Clark <james.clark@linaro.org> Signed-off-by: Namhyung Kim <namhyung@kernel.org> |
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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.