2 # -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
3 # SPDX-License-Identifier: LGPL-2.1+
5 # This file is part of elogind.
7 # Copyright 2014 Michal Schmidt
9 # elogind is free software; you can redistribute it and/or modify it
10 # under the terms of the GNU Lesser General Public License as published by
11 # the Free Software Foundation; either version 2.1 of the License, or
12 # (at your option) any later version.
14 # elogind is distributed in the hope that it will be useful, but
15 # WITHOUT ANY WARRANTY; without even the implied warranty of
16 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 # Lesser General Public License for more details.
19 # You should have received a copy of the GNU Lesser General Public License
20 # along with elogind; If not, see <http://www.gnu.org/licenses/>.
24 class sd_dump_hashmaps(gdb.Command):
25 "dump elogind's hashmaps"
28 super(sd_dump_hashmaps, self).__init__("sd_dump_hashmaps", gdb.COMMAND_DATA, gdb.COMPLETE_NONE)
30 def invoke(self, arg, from_tty):
31 d = gdb.parse_and_eval("hashmap_debug_list")
32 all_entry_sizes = gdb.parse_and_eval("all_entry_sizes")
33 all_direct_buckets = gdb.parse_and_eval("all_direct_buckets")
34 hashmap_base_t = gdb.lookup_type("HashmapBase")
35 uchar_t = gdb.lookup_type("unsigned char")
36 ulong_t = gdb.lookup_type("unsigned long")
37 debug_offset = gdb.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
39 print "type, hash, indirect, entries, max_entries, buckets, creator"
41 h = gdb.parse_and_eval("(HashmapBase*)((char*)%d - %d)" % (int(d.cast(ulong_t)), debug_offset))
44 storage_ptr = h["indirect"]["storage"].cast(uchar_t.pointer())
45 n_entries = h["indirect"]["n_entries"]
46 n_buckets = h["indirect"]["n_buckets"]
48 storage_ptr = h["direct"]["storage"].cast(uchar_t.pointer())
49 n_entries = h["n_direct_entries"]
50 n_buckets = all_direct_buckets[int(h["type"])];
52 t = ["plain", "ordered", "set"][int(h["type"])]
54 print "%s, %s, %s, %d, %d, %d, %s (%s:%d)" % (t, h["hash_ops"], bool(h["has_indirect"]), n_entries, d["max_entries"], n_buckets, d["func"], d["file"], d["line"])
56 if arg != "" and n_entries > 0:
57 dib_raw_addr = storage_ptr + (all_entry_sizes[h["type"]] * n_buckets)
60 for i in xrange(0, n_buckets):
61 dib = int(dib_raw_addr[i])
62 histogram[dib] = histogram.get(dib, 0) + 1
64 for dib in sorted(iter(histogram)):
66 print "%3d %8d %f%% of entries" % (dib, histogram[dib], 100.0*histogram[dib]/n_entries)
68 print "%3d %8d %f%% of slots" % (dib, histogram[dib], 100.0*histogram[dib]/n_buckets)
69 print "mean DIB of entries: %f" % (sum([dib*histogram[dib] for dib in iter(histogram) if dib != 255])*1.0/n_entries)
73 prev = int(dib_raw_addr[0])
74 for i in xrange(1, n_buckets):
75 dib = int(dib_raw_addr[i])
76 if (dib == 255) != (prev == 255):
78 blocks += [[i, current_len]]
85 blocks += [[i, current_len]]
86 # a block may be wrapped around
87 if len(blocks) > 1 and blocks[0][0] == blocks[0][1] and blocks[-1][0] == n_buckets - 1:
88 blocks[0][1] += blocks[-1][1]
90 print "max block: %s" % max(blocks, key=lambda a: a[1])
91 print "sum block lens: %d" % sum(b[1] for b in blocks)
92 print "mean block len: %f" % (1.0 * sum(b[1] for b in blocks) / len(blocks))
94 d = d["debug_list_next"]