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How could I get my program's functions when using perf and converting the data in JSON?

matburnx
matburnx Posts: 2
in Kernel Development

Hello,
I'd like to use the tool perf to know how much time was needed to execute each method of a program I've made in Smalltalk (Pharo), however I'd also like to get the data in JSON through the perf data convert --to-json command after having done perf record ....
For now, it only gives the system calls whereas if I do the perf report > file.txt I get the Smalltalk's methods but the data is not really parsable.
Does anyone have any idea of how I could fix that?

Answers

  • matburnx
    matburnx Posts: 2

    The version of my kernel is 6.8.0
    From the txt file I get something like this :

        12.42%     0.00%  pharo            libPharoVMCore.so                            [.] runOnMainThread (inlined)
            |
            ---runOnMainThread (inlined)
               runVMThread (inlined)
               |          
               |--8.50%--loadPharoImage
               |          readImageNamed
               |          allocateMemoryForImagewithHeader.isra.0
               |          initializeObjectMemory
               |          |          
               |           --0.51%--lastPointerOfWhileSwizzling
               |          
                --3.93%--interpret
                          enterSmalltalkExecutiveImplementation
                          interpret
                          |          
                           --3.24%--primitiveAllInstances
                                     allInstancesOf

    And the JSON file gives me something like this (they do not represent the same sample but come from the same perf.data file) :

    {
"timestamp": 19015602195292,
"pid": 19473,
"tid": 19473,
"comm": "pharo",
"callchain": [
{
    "ip": "0xffffffff92611bfa",
    "symbol": "handle_mm_fault",
    "dso": "[kernel.kallsyms]"
},
{
    "ip": "0xffffffff922cb588",
    "symbol": "do_user_addr_fault",
    "dso": "[kernel.kallsyms]"
},
{
    "ip": "0xffffffff933e2693",
    "symbol": "exc_page_fault",
    "dso": "[kernel.kallsyms]"
},
{
    "ip": "0xffffffff93400ba7",
    "symbol": "asm_exc_page_fault",
    "dso": "[kernel.kallsyms]"
}
]
},

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