x86/perf: Improve sysfs enumeration for cpu pmu

From: Andi Kleen
Date: Tue Aug 22 2017 - 14:52:12 EST

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Some improvements for the sysfs enumeration for the cpu pmu to make
it easier for user programs to discover what is supported.

-Andi

Next message: Andi Kleen: "[PATCH v1 1/2] x86/perf: Only show format attributes when supported"
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