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    SubjectRe: [PATCH 2/6] perf, tools, stat: Implement CSV metrics output
    Em Wed, Feb 17, 2016 at 02:44:01PM -0800, Andi Kleen escreveu:
    > 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.
    >
    > This allows to easily plot metrics from CSV files.
    >
    > 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
    > .502457,,task-clock,502457,100.00,0.485,CPUs utilized
    > 0,,context-switches,502457,100.00,0.000,K/sec
    > 0,,cpu-migrations,502457,100.00,0.000,K/sec
    > 45,,page-faults,502457,100.00,0.090,M/sec
    > 644692,,cycles,509102,100.00,1.283,GHz
    > 423470,,stalled-cycles-frontend,509102,100.00,65.69,frontend cycles idle
    > <not supported>,,stalled-cycles-backend,0,100.00,,,,
    > 492701,,instructions,509102,100.00,0.76,insn per cycle
    > ,,,,,0.86,stalled cycles per insn
    > 97767,,branches,509102,100.00,194.578,M/sec
    > 4788,,branch-misses,509102,100.00,4.90,of all branches

    Testing here I noticed this new line with just commas:


    [root@jouet ~]# perf stat -x, usleep 1
    0.268163,,task-clock,268163,100.00,0.484,CPUs utilized
    1,,context-switches,268163,100.00,0.004,M/sec
    0,,cpu-migrations,268163,100.00,0.000,K/sec
    52,,page-faults,268163,100.00,0.194,M/sec
    815922,,cycles,270746,100.00,3.043,GHz
    <not supported>,,stalled-cycles-frontend,0,100.00,,,,
    <not supported>,,stalled-cycles-backend,0,100.00,,,,
    680198,,instructions,270746,100.00,0.83,insn per cycle
    ,,,,,,,,
    136401,,branches,270746,100.00,508.650,M/sec
    6995,,branch-misses,270746,100.00,5.13,of all branches
    [root@jouet ~]#

    Where before it wasn't there:

    cat /tmp/before
    0.282628,,task-clock,282628,100.00
    1,,context-switches,282628,100.00
    0,,cpu-migrations,282628,100.00
    52,,page-faults,282628,100.00
    861213,,cycles,285354,100.00
    <not supported>,,stalled-cycles-frontend,0,100.00
    <not supported>,,stalled-cycles-backend,0,100.00
    686082,,instructions,285354,100.00
    137846,,branches,285354,100.00
    7142,,branch-misses,285354,100.00


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