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When an event/alias is created for a PMU the terms are eagerly parsed using parse_events_terms. For a command like perf stat or perf record, the particular event/alias will be found, the terms parsed, the terms cloned for use in the event parsing, and then the terms used to configure the perf_event_attr. Events/aliases may be eagerly loaded, such as from sysfs or in perf list, in which case the aliases terms will be little or never used. To avoid redundant work, to avoid cloning, and to reduce memory overhead, hold the terms for an event as a string until they need handling as a term list. This may introduce duplicate parsing if an event is repeated in a list, but this situation is expected to be uncommon. Measuring the number of instructions before and after with a sysfs event and perf stat, there is a minor reduction in the number of instructions executed by 0.3%. 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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| drivers | ||
| fs | ||
| include | ||
| init | ||
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| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| virt | ||
| .clang-format | ||
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| .gitattributes | ||
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| .mailmap | ||
| .pylintrc | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
| Kconfig | ||
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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 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.