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    SubjectRe: [PATCH] sched: Provide iowait counters
    Peter Zijlstra wrote:
    >
    > It might be nice to put a tracepoint there as well, now if there was a
    > way to specify perf counter attributes in the TRACE_EVENT() magic so
    > that we can feed stuff into perf_tpcounter_event().
    >
    > TP_perf_addr() -- defaults to 0 when not specified
    > TP_perf_count() -- defaults to 1 when not specified.
    >
    > Steve, Frederic, is there any way to make that happen?
    >
    > Failing that we could put an actual swcounter in there I suppose.
    >
    > That way we could profile applications based on IO-wait, which would be
    > cool.

    it'd be nice if this was also a perfcounter event, no doubt about that
    (I already have some usages in mind).... but that'd be a separate patch.


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