Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
25 lines
1.0 KiB
Plaintext
25 lines
1.0 KiB
Plaintext
What: /sys/bus/event_source/devices/<dev>/caps
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Date: May 2022
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KernelVersion: 5.19
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description:
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Attribute group to describe the capabilities exposed
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for a particular pmu. Each attribute of this group can
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expose information specific to a PMU, say pmu_name, so that
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userspace can understand some of the feature which the
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platform specific PMU supports.
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One of the example available capability in supported platform
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like Intel is pmu_name, which exposes underlying CPU name known
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to the PMU driver.
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Example output in powerpc:
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grep . /sys/bus/event_source/devices/cpu/caps/*
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/sys/bus/event_source/devices/cpu/caps/pmu_name:POWER9
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The "branch_counter_nr" in the supported platform exposes the
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maximum number of counters which can be shown in the u64 counters
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of PERF_SAMPLE_BRANCH_COUNTERS, while the "branch_counter_width"
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exposes the width of each counter. Both of them can be used by
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the perf tool to parse the logged counters in each branch.
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