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#!/usr/bin/python
# SPDX-License-Identifier: GPL-2.0
# Determine the maximum size of branch stacks in a perf.data file.
import argparse
import sys
import perf
def main():
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--input", default="perf.data", help="Input file name")
args = ap.parse_args()
bmax = 0
def process_event(sample):
nonlocal bmax
try:
brstack = sample.brstack
if brstack:
n = len(list(brstack))
if n > bmax:
bmax = n
except AttributeError:
pass
session = None
try:
session = perf.session(perf.data(args.input), sample=process_event)
session.process_events()
print("max brstack", bmax)
except Exception as e:
print(f"Error processing events: {e}", file=sys.stderr)
sys.exit(1)
finally:
session = None
if __name__ == "__main__":
main()
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