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    SubjectRe: [PATCH 2/7] perf: Create a symlink for a PMU
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    On 6/25/2021 11:44 AM, Andi Kleen wrote:
    >
    >> We have an attribute "caps/pmu_name" for the core PMU. Maybe we should
    >> add it for uncore PMU as well. For example,
    >>
    >> $ cat /sys/devices/uncore_type_0_0/caps/pmu_name
    >> cha_0
    >>
    >> Userspace tool can get clues about what type_0_0 is.
    >
    > It would break all the old tools, but I suppose it could work for
    > updated tools.
    >

    Right, users have to update their perf tool to use the new name,
    uncore_cha_0.

    > It isn't only perf that is parsing this, but some other libraries too.
    > They all would need to be updated too.
    >

    Yes, I will update the Documentation/ABI/ in V2 to indicate the changes.
    If any other libraries are broken, they may get clues from the Document.

    Thanks,
    Kan

    > I think I still prefer the symlink. It would just work and keep full
    > compatibility.
    >
    > But yes maybe there is no choice.
    >
    > -Andi
    >
    >

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