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    SubjectRe: [PATCH 0/4] perf: Fix the ctx->pmu for a hybrid system
    On Wed, Jun 16, 2021 at 11:55:30AM -0700, kan.liang@linux.intel.com wrote:

    > To fix the issue, the generic perf codes have to understand the
    > supported CPU mask of a specific hybrid PMU. So it can update the
    > ctx->pmu accordingly, when a task is scheduled on a CPU which has
    > a different type of PMU from the previous CPU. The supported_cpus
    > has to be moved to the struct pmu.

    Urghh.. I so hate this :-/

    I *did* point you to:

    https://lore.kernel.org/lkml/20181010104559.GO5728@hirez.programming.kicks-ass.net/

    when you started this whole hybrid crud, and I think that's still the
    correct thing to do.

    Still, let me consider if there's a workable short-term cludge I hate
    less.

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