66 lines
1.8 KiB
Python
66 lines
1.8 KiB
Python
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#!/usr/bin/env python3
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#
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# Copyright (c) 2023 KNS Group LLC (YADRO)
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# Copyright (c) 2020 Yonatan Goldschmidt <yon.goldschmidt@gmail.com>
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#
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# SPDX-License-Identifier: Apache-2.0
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"""
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Stack compressor for FlameGraph
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This translate stack samples captured by perf subsystem into format
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used by flamegraph.pl. Translation uses .elf file to get function names
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from addresses
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Usage:
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./script/perf/stackcollapse.py <file with perf printbuf output> <ELF file>
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"""
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import re
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import sys
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import struct
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import binascii
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from functools import lru_cache
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from elftools.elf.elffile import ELFFile
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@lru_cache(maxsize=None)
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def addr_to_sym(addr, elf):
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symtab = elf.get_section_by_name(".symtab")
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for sym in symtab.iter_symbols():
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if sym.entry.st_info.type == "STT_FUNC" and sym.entry.st_value <= addr < sym.entry.st_value + sym.entry.st_size:
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return sym.name
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if addr == 0:
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return "nullptr"
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return "[unknown]"
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def collapse(buf, elf):
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while buf:
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count, = struct.unpack_from(">Q", buf)
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assert count > 0
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addrs = struct.unpack_from(f">{count}Q", buf, 8)
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func_trace = reversed(list(map(lambda a: addr_to_sym(a, elf), addrs)))
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prev_func = next(func_trace)
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line = prev_func
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# merge dublicate functions
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for func in func_trace:
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if prev_func != func:
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prev_func = func
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line += ";" + func
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print(line, 1)
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buf = buf[8 + 8 * count:]
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if __name__ == "__main__":
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elf = ELFFile(open(sys.argv[2], "rb"))
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with open(sys.argv[1], "r") as f:
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inp = f.read()
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lines = inp.splitlines()
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assert int(re.match(r"Perf buf length (\d+)", lines[0]).group(1)) == len(lines) - 1
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buf = binascii.unhexlify("".join(lines[1:]))
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collapse(buf, elf)
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