File: logalloc_stats.py

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#!/usr/bin/python3
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at https://mozilla.org/MPL/2.0/.


import sys

from logalloc_munge import split_log_line


def get_size(line):
    try:
        pid, tid, func, args, result = split_log_line(line)
        if func == "malloc":
            return int(args[0])
        elif func == "calloc":
            return int(args[0]) * int(args[1])
        elif func == "memalign":
            return int(args[1])
        elif func == "realloc":
            return int(args[1])
        else:
            return None
    except Exception:
        return None


def main():
    small = 0
    large = 0
    huge = 0

    for line in sys.stdin:
        size = get_size(line.strip())
        if not size:
            continue

        # Assumes a 4KiB page size, which is not true on Apple Silicon and
        # some other platforms.
        if size < 4096:
            small += 1
        elif size < 1024 * 1024:
            large += 1
        else:
            huge += 1

    total = small + large + huge

    def print_percent(name, value):
        pct = 100 * value / total
        print(f"{name:<5}: {value:>12,} {pct:6.2f}%")

    print_percent("Small", small)
    print_percent("Large", large)
    print_percent("Huge", huge)


if __name__ == "__main__":
    main()