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Perf has supported the CPU_PMU_CAPS feature to display a list of CPU PMU capabilities. But on a hybrid platform, it may have several CPU PMUs (such as "cpu_core" and "cpu_atom"). The CPU_PMU_CAPS feature is hard to extend to support multiple CPU PMUs well if it needs to be compatible for the case of old perf data file + new perf tool. So for better compatibility we now create a new feature HYBRID_CPU_PMU_CAPS in the header. For the perf.data generated on hybrid platform, root@otcpl-adl-s-2:~# perf report --header-only -I # cpu_core pmu capabilities: branches=32, max_precise=3, pmu_name=alderlake_hybrid # cpu_atom pmu capabilities: branches=32, max_precise=3, pmu_name=alderlake_hybrid # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CPU_PMU_CAPS CLOCK_DATA For the perf.data generated on non-hybrid platform root@kbl-ppc:~# perf report --header-only -I # cpu pmu capabilities: branches=32, max_precise=3, pmu_name=skylake # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA HYBRID_TOPOLOGY HYBRID_CPU_PMU_CAPS Signed-off-by: Jin Yao <yao.jin@linux.intel.com> Acked-by: Jiri Olsa <jolsa@redhat.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jin Yao <yao.jin@intel.com> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lore.kernel.org/lkml/20210514122948.9472-3-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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.