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    SubjectRe: [PATCH 4/8] perf, tools, stat: Implement CSV metrics output
    On Sat, Jan 30, 2016 at 09:06:52AM -0800, Andi Kleen wrote:
    > From: Andi Kleen <ak@linux.intel.com>
    >
    > Now support CSV output for metrics. With the new output callbacks
    > this is relatively straight forward by creating new callbacks.
    >
    > The new line callback needs to know the number of fields to skip them
    > correctly
    >
    > Example output before:
    >
    > % perf stat -x, true
    > 0.200687,,task-clock,200687,100.00
    > 0,,context-switches,200687,100.00
    > 0,,cpu-migrations,200687,100.00
    > 40,,page-faults,200687,100.00
    > 730871,,cycles,203601,100.00
    > 551056,,stalled-cycles-frontend,203601,100.00
    > <not supported>,,stalled-cycles-backend,0,100.00
    > 385523,,instructions,203601,100.00
    > 78028,,branches,203601,100.00
    > 3946,,branch-misses,203601,100.00
    >
    > After:
    >
    > % perf stat -x, true
    > 0.341119,,task-clock,0.461,CPUs utilized,0.00%,324342,100.00
    > 0,,context-switches,0.000,K/sec,0.00%,324342,100.00
    > 0,,cpu-migrations,0.000,K/sec,0.00%,324342,100.00
    > 41,,page-faults,0.126,M/sec,0.00%,324342,100.00
    > 674068,,cycles,2.078,GHz,0.00%,330887,100.00
    > 508189,,stalled-cycles-frontend,82.31,frontend cycles idle,0.00%,330887,100.00
    > <not supported>,,stalled-cycles-backend,,,0.00%,0,100.00
    > 374932,,instructions,0.61,insn per cycle
    > ,,,1.20,stalled cycles per insn,0.00%,330887,100.00
    > 76540,,branches,235.985,M/sec,0.00%,330887,100.00
    > 3091,,branch-misses,4.09,of all branches,0.00%,330887,100.00

    $ ./perf stat -x, true
    0.279104,,task-clock,0.461,CPUs utilized,279104,100.00
    0,,context-switches,0.000,K/sec,279104,100.00
    0,,cpu-migrations,0.000,K/sec,279104,100.00
    42,,page-faults,0.150,M/sec,279104,100.00
    658540,,cycles,2.359,GHz,281617,100.00
    <not supported>,,stalled-cycles-frontend,,,,,0,100.00
    <not supported>,,stalled-cycles-backend,,,,,0,100.00
    428955,,instructions,0.65,insn per cycle

    ,,,,,,,281617,100.00
    ^^^^^^^^^^^^^^^^^^^^ it does not look like this one is correct

    84032,,branches,301.078,M/sec,281617,100.00
    3628,,branch-misses,4.32,of all branches,281617,100.00

    >
    > Two new fields are added: metric value and metric name before
    > the running/enabled fields.

    I see, I thought it was meant to be the other way around,
    so I need to ask now, wouldn't this break existing parsers?

    thanks,
    jirka

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