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https://github.com/systemd/systemd-stable.git
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e12f397683
This GDB script was converted to use Python 3 along with all other
Python scripts in commit b95f5528cc, but still used the Python 2 print
statement syntax instead of the Python 3 print function. Fix that.
We also add the Python 2 compatibility statement, just in case some GDB
still uses Python 2 instead of Python 3.
82 lines
4.4 KiB
Python
82 lines
4.4 KiB
Python
#!/usr/bin/env python3
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# -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
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# SPDX-License-Identifier: LGPL-2.1+
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from __future__ import print_function
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import gdb
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class sd_dump_hashmaps(gdb.Command):
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"dump systemd's hashmaps"
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def __init__(self):
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super(sd_dump_hashmaps, self).__init__("sd_dump_hashmaps", gdb.COMMAND_DATA, gdb.COMPLETE_NONE)
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def invoke(self, arg, from_tty):
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d = gdb.parse_and_eval("hashmap_debug_list")
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all_entry_sizes = gdb.parse_and_eval("all_entry_sizes")
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all_direct_buckets = gdb.parse_and_eval("all_direct_buckets")
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hashmap_base_t = gdb.lookup_type("HashmapBase")
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uchar_t = gdb.lookup_type("unsigned char")
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ulong_t = gdb.lookup_type("unsigned long")
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debug_offset = gdb.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
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print("type, hash, indirect, entries, max_entries, buckets, creator")
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while d:
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h = gdb.parse_and_eval("(HashmapBase*)((char*)%d - %d)" % (int(d.cast(ulong_t)), debug_offset))
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if h["has_indirect"]:
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storage_ptr = h["indirect"]["storage"].cast(uchar_t.pointer())
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n_entries = h["indirect"]["n_entries"]
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n_buckets = h["indirect"]["n_buckets"]
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else:
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storage_ptr = h["direct"]["storage"].cast(uchar_t.pointer())
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n_entries = h["n_direct_entries"]
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n_buckets = all_direct_buckets[int(h["type"])];
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t = ["plain", "ordered", "set"][int(h["type"])]
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print("{}, {}, {}, {}, {}, {}, {} ({}:{})".format(t, h["hash_ops"], bool(h["has_indirect"]), n_entries, d["max_entries"], n_buckets, d["func"], d["file"], d["line"]))
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if arg != "" and n_entries > 0:
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dib_raw_addr = storage_ptr + (all_entry_sizes[h["type"]] * n_buckets)
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histogram = {}
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for i in xrange(0, n_buckets):
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dib = int(dib_raw_addr[i])
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histogram[dib] = histogram.get(dib, 0) + 1
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for dib in sorted(iter(histogram)):
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if dib != 255:
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print("{:>3} {:>8} {} of entries".format(dib, histogram[dib], 100.0*histogram[dib]/n_entries))
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else:
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print("{:>3} {:>8} {} of slots".format(dib, histogram[dib], 100.0*histogram[dib]/n_buckets))
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print("mean DIB of entries: {}".format(sum([dib*histogram[dib] for dib in iter(histogram) if dib != 255])*1.0/n_entries))
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blocks = []
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current_len = 1
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prev = int(dib_raw_addr[0])
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for i in xrange(1, n_buckets):
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dib = int(dib_raw_addr[i])
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if (dib == 255) != (prev == 255):
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if prev != 255:
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blocks += [[i, current_len]]
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current_len = 1
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else:
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current_len += 1
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prev = dib
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if prev != 255:
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blocks += [[i, current_len]]
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# a block may be wrapped around
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if len(blocks) > 1 and blocks[0][0] == blocks[0][1] and blocks[-1][0] == n_buckets - 1:
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blocks[0][1] += blocks[-1][1]
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blocks = blocks[0:-1]
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print("max block: {}".format(max(blocks, key=lambda a: a[1])))
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print("sum block lens: {}".format(sum(b[1] for b in blocks)))
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print("mean block len: {}".format((1.0 * sum(b[1] for b in blocks) / len(blocks))))
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d = d["debug_list_next"]
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sd_dump_hashmaps()
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