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Linux kernel source tree
c760174401
Fewer than 32k logical CPUs are currently supported by perf. A cpumap is indexed by an integer (see perf_cpu_map__cpu) yielding a perf_cpu that wraps a 4-byte int for the logical CPU - the wrapping is done deliberately to avoid confusing a logical CPU with an index into a cpumap. Using a 4-byte int within the perf_cpu is larger than required so this patch reduces it to the 2-byte int16_t. For a cpumap containing 16 entries this will reduce the array size from 64 to 32 bytes. For very large servers with lots of logical CPUs the size savings will be greater. Signed-off-by: Ian Rogers <irogers@google.com> Reviewed-by: James Clark <james.clark@linaro.org> Link: https://lore.kernel.org/r/20250210191231.156294-1-irogers@google.com Signed-off-by: Namhyung Kim <namhyung@kernel.org> |
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
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| net | ||
| rust | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
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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.