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    SubjectRe: [RFC][PATCH 2/3] perf: Take a hot regs snapshot for trace events
    On Wed, 2010-03-03 at 12:07 -0500, Steven Rostedt wrote:
    > oops, my bad :-), I thought this was in the x86 arch directory. For the
    > University, I was helping them with adding trace points for page faults
    > when I came across this in arch/x86/mm/fault.c:
    > perf_sw_event(PERF_COUNT_SW_PAGE_FAULTS, 1, 0, regs, address);
    > This is what I actually was wondering about. Why is it a "perf only"
    > trace point instead of a TRACE_EVENT()?

    Because I wanted to make perf usable without having to rely on funny
    tracepoints. That is, I am less worried about committing software
    counters to ABI than I am about TRACE_EVENT(), which still gives me a
    terribly uncomfortable feeling.

    Also, building with all CONFIG_TRACE_*=n will still yield a usable perf,
    which is something the embedded people might fancy, all that TRACE stuff
    adds lots of code.

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      Last update: 2010-03-03 18:19    [W:0.019 / U:15.884 seconds]
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