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f466e5ed6c
Extend --threads option in perf record command line interface. The option can have a value in the form of masks that specify CPUs to be monitored with data streaming threads and its layout in system topology. The masks can be filtered using CPU mask provided via -C option. The specification value can be user defined list of masks. Masks separated by colon define CPUs to be monitored by one thread and affinity mask of that thread is separated by slash. For example: <cpus mask 1>/<affinity mask 1>:<cpu mask 2>/<affinity mask 2> specifies parallel threads layout that consists of two threads with corresponding assigned CPUs to be monitored. The specification value can be a string e.g. "cpu", "core" or "package" meaning creation of data streaming thread for every CPU or core or package to monitor distinct CPUs or CPUs grouped by core or package. The option provided with no or empty value defaults to per-cpu parallel threads layout creating data streaming thread for every CPU being monitored. Document --threads option syntax and parallel data streaming modes in Documentation/perf-record.txt. Suggested-by: Jiri Olsa <jolsa@kernel.org> Suggested-by: Namhyung Kim <namhyung@kernel.org> Reviewed-by: Riccardo Mancini <rickyman7@gmail.com> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@linux.intel.com> Tested-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Riccardo Mancini <rickyman7@gmail.com> Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Namhyung Kim <namhyung@gmail.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Antonov <alexander.antonov@linux.intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Budankov <abudankov@huawei.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/079e2619be70c465317cf7c9fdaf5fa069728c32.1642440724.git.alexey.v.bayduraev@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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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 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.