]>
git.ipfire.org Git - thirdparty/systemd.git/blob - tools/gdb-sd_dump_hashmaps.py
2 # -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
4 # This file is part of systemd.
6 # Copyright 2014 Michal Schmidt
8 # systemd is free software; you can redistribute it and/or modify it
9 # under the terms of the GNU Lesser General Public License as published by
10 # the Free Software Foundation; either version 2.1 of the License, or
11 # (at your option) any later version.
13 # systemd is distributed in the hope that it will be useful, but
14 # WITHOUT ANY WARRANTY; without even the implied warranty of
15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 # Lesser General Public License for more details.
18 # You should have received a copy of the GNU Lesser General Public License
19 # along with systemd; If not, see <http://www.gnu.org/licenses/>.
23 class sd_dump_hashmaps(gdb
.Command
):
24 "dump systemd's hashmaps"
27 super(sd_dump_hashmaps
, self
).__init
__("sd_dump_hashmaps", gdb
.COMMAND_DATA
, gdb
.COMPLETE_NONE
)
29 def invoke(self
, arg
, from_tty
):
30 d
= gdb
.parse_and_eval("hashmap_debug_list")
31 all_entry_sizes
= gdb
.parse_and_eval("all_entry_sizes")
32 all_direct_buckets
= gdb
.parse_and_eval("all_direct_buckets")
33 hashmap_base_t
= gdb
.lookup_type("HashmapBase")
34 uchar_t
= gdb
.lookup_type("unsigned char")
35 ulong_t
= gdb
.lookup_type("unsigned long")
36 debug_offset
= gdb
.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
38 print "type, hash, indirect, entries, max_entries, buckets, creator"
40 h
= gdb
.parse_and_eval("(HashmapBase*)((char*)%d - %d)" % (int(d
.cast(ulong_t
)), debug_offset
))
43 storage_ptr
= h
["indirect"]["storage"].cast(uchar_t
.pointer())
44 n_entries
= h
["indirect"]["n_entries"]
45 n_buckets
= h
["indirect"]["n_buckets"]
47 storage_ptr
= h
["direct"]["storage"].cast(uchar_t
.pointer())
48 n_entries
= h
["n_direct_entries"]
49 n_buckets
= all_direct_buckets
[int(h
["type"])];
51 t
= ["plain", "ordered", "set"][int(h
["type"])]
53 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"])
55 if arg
!= "" and n_entries
> 0:
56 dib_raw_addr
= storage_ptr
+ (all_entry_sizes
[h
["type"]] * n_buckets
)
59 for i
in xrange(0, n_buckets
):
60 dib
= int(dib_raw_addr
[i
])
61 histogram
[dib
] = histogram
.get(dib
, 0) + 1
63 for dib
in sorted(iter(histogram
)):
65 print "%3d %8d %f%% of entries" % (dib
, histogram
[dib
], 100.0*histogram
[dib
]/n_entries
)
67 print "%3d %8d %f%% of slots" % (dib
, histogram
[dib
], 100.0*histogram
[dib
]/n_buckets
)
68 print "mean DIB of entries: %f" % (sum([dib
*histogram
[dib
] for dib
in iter(histogram
) if dib
!= 255])*1.0/n_entries
)
72 prev
= int(dib_raw_addr
[0])
73 for i
in xrange(1, n_buckets
):
74 dib
= int(dib_raw_addr
[i
])
75 if (dib
== 255) != (prev
== 255):
77 blocks
+= [[i
, current_len
]]
84 blocks
+= [[i
, current_len
]]
85 # a block may be wrapped around
86 if len(blocks
) > 1 and blocks
[0][0] == blocks
[0][1] and blocks
[-1][0] == n_buckets
- 1:
87 blocks
[0][1] += blocks
[-1][1]
89 print "max block: %s" % max(blocks
, key
=lambda a
: a
[1])
90 print "sum block lens: %d" % sum(b
[1] for b
in blocks
)
91 print "mean block len: %f" % (1.0 * sum(b
[1] for b
in blocks
) / len(blocks
))
93 d
= d
["debug_list_next"]