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https://github.com/systemd/systemd-stable.git
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2ea8c08306
$ sudo gdb -p 1
...
(gdb) source gdb-sd_dump_hashmaps.py
(gdb) sd_dump_hashmaps
... lists allocated hashmaps ...
(gdb) sd_dump_hashmaps 1
... lists allocated hashmaps, their DIB histograms and contiguous
blocks statistics ...
95 lines
5.0 KiB
Python
95 lines
5.0 KiB
Python
# -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
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#
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# This file is part of systemd.
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#
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# Copyright 2014 Michal Schmidt
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#
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# systemd is free software; you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# systemd is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with systemd; If not, see <http://www.gnu.org/licenses/>.
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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 "%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"])
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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 "%3d %8d %f%% of entries" % (dib, histogram[dib], 100.0*histogram[dib]/n_entries)
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else:
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print "%3d %8d %f%% of slots" % (dib, histogram[dib], 100.0*histogram[dib]/n_buckets)
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print "mean DIB of entries: %f" % (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: %s" % max(blocks, key=lambda a: a[1])
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print "sum block lens: %d" % sum(b[1] for b in blocks)
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print "mean block len: %f" % (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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