From b750101eb236130cf056c675997decbac904cc49 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 17:35:18 +0200 Subject: Adding upstream version 252.22. Signed-off-by: Daniel Baumann --- tools/gdb-sd_dump_hashmaps.py | 77 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 tools/gdb-sd_dump_hashmaps.py (limited to 'tools/gdb-sd_dump_hashmaps.py') diff --git a/tools/gdb-sd_dump_hashmaps.py b/tools/gdb-sd_dump_hashmaps.py new file mode 100644 index 0000000..d2388b7 --- /dev/null +++ b/tools/gdb-sd_dump_hashmaps.py @@ -0,0 +1,77 @@ +#!/usr/bin/env python3 +# SPDX-License-Identifier: LGPL-2.1-or-later + +import gdb + +class sd_dump_hashmaps(gdb.Command): + "dump systemd's hashmaps" + + def __init__(self): + super().__init__("sd_dump_hashmaps", gdb.COMMAND_DATA, gdb.COMPLETE_NONE) + + def invoke(self, arg, from_tty): + d = gdb.parse_and_eval("hashmap_debug_list") + hashmap_type_info = gdb.parse_and_eval("hashmap_type_info") + uchar_t = gdb.lookup_type("unsigned char") + ulong_t = gdb.lookup_type("unsigned long") + debug_offset = gdb.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug") + + print("type, hash, indirect, entries, max_entries, buckets, creator") + while d: + h = gdb.parse_and_eval(f"(HashmapBase*)((char*){int(d.cast(ulong_t))} - {debug_offset})") + + if h["has_indirect"]: + storage_ptr = h["indirect"]["storage"].cast(uchar_t.pointer()) + n_entries = h["indirect"]["n_entries"] + n_buckets = h["indirect"]["n_buckets"] + else: + storage_ptr = h["direct"]["storage"].cast(uchar_t.pointer()) + n_entries = h["n_direct_entries"] + n_buckets = hashmap_type_info[h["type"]]["n_direct_buckets"] + + t = ["plain", "ordered", "set"][int(h["type"])] + + print(f'{t}, {h["hash_ops"]}, {bool(h["has_indirect"])}, {n_entries}, {d["max_entries"]}, {n_buckets}, {d["func"].string()}, {d["file"].string()}:{d["line"]}') + + if arg != "" and n_entries > 0: + dib_raw_addr = storage_ptr + hashmap_type_info[h["type"]]["entry_size"] * n_buckets + + histogram = {} + for i in range(0, n_buckets): + dib = int(dib_raw_addr[i]) + histogram[dib] = histogram.get(dib, 0) + 1 + + for dib in sorted(histogram): + if dib != 255: + print(f"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_entries):.0%} of entries") + else: + print(f"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_buckets):.0%} of slots") + s = sum(dib*count for (dib, count) in histogram.items() if dib != 255) / n_entries + print(f"mean DIB of entries: {s}") + + blocks = [] + current_len = 1 + prev = int(dib_raw_addr[0]) + for i in range(1, n_buckets): + dib = int(dib_raw_addr[i]) + if (dib == 255) != (prev == 255): + if prev != 255: + blocks += [[i, current_len]] + current_len = 1 + else: + current_len += 1 + + prev = dib + if prev != 255: + blocks += [[i, current_len]] + # a block may be wrapped around + if len(blocks) > 1 and blocks[0][0] == blocks[0][1] and blocks[-1][0] == n_buckets - 1: + blocks[0][1] += blocks[-1][1] + blocks = blocks[0:-1] + print("max block: {}".format(max(blocks, key=lambda a: a[1]))) + print("sum block lens: {}".format(sum(b[1] for b in blocks))) + print("mean block len: {}".format(sum(b[1] for b in blocks) / len(blocks))) + + d = d["debug_list_next"] + +sd_dump_hashmaps() -- cgit v1.2.3