Re: [PATCH] perf script: add flamegraph.py script

[Kim Phillips]

On 4/2/20 8:04 AM, Andreas Gerstmayr wrote:
> On 26.03.20 20:04, Kim Phillips wrote:
>> I now get a SIGSEGV when executing perf script report flamegraph.
>>
>> Here's a trace:
>>
>> #0Â 0x000055555590a9b2 in regs_map (regs=0x7fffffffbfc8, mask=16715775,
>> ÂÂÂÂ bf=0x7fffffffba60 "", size=512) at util/scripting-engines/trace-event-python.c:696
>> #1Â 0x000055555590ab03 in set_regs_in_dict (dict=0x7ffff61dd500, sample=0x7fffffffbf20,
>> ÂÂÂÂ evsel=0x555555d7a700) at util/scripting-engines/trace-event-python.c:718
> 
> This error seems unrelated to flamegraph.py (occurs also with the stackcollapse.py script).
> 
> Looks like the intr_regs->regs can be 0 when running in DWARF mode (this error doesn't occur in the default mode). I've added a check and sent a patch. While at it, valgrind reported an invalid read in a different code path, which is fixed by the other patch I just sent a few minutes ago.
> 
> Can you please test again and report if there are any other issues?

This flamegraph patch works for me now:

Tested-by: Kim Phillips <kim.phillips@xxxxxxx>

Thanks,

Kim