]>
git.ipfire.org Git - thirdparty/systemd.git/blob - tools/gdb-sd_dump_hashmaps.py
2 # SPDX-License-Identifier: LGPL-2.1-or-later
6 class sd_dump_hashmaps(gdb
.Command
):
7 "dump systemd's hashmaps"
10 super().__init
__("sd_dump_hashmaps", gdb
.COMMAND_DATA
, gdb
.COMPLETE_NONE
)
12 def invoke(self
, arg
, from_tty
):
13 d
= gdb
.parse_and_eval("hashmap_debug_list")
14 hashmap_type_info
= gdb
.parse_and_eval("hashmap_type_info")
15 uchar_t
= gdb
.lookup_type("unsigned char")
16 ulong_t
= gdb
.lookup_type("unsigned long")
17 debug_offset
= gdb
.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
19 print("type, hash, indirect, entries, max_entries, buckets, creator")
21 h
= gdb
.parse_and_eval(f
"(HashmapBase*)((char*){int(d.cast(ulong_t))} - {debug_offset})")
24 storage_ptr
= h
["indirect"]["storage"].cast(uchar_t
.pointer())
25 n_entries
= h
["indirect"]["n_entries"]
26 n_buckets
= h
["indirect"]["n_buckets"]
28 storage_ptr
= h
["direct"]["storage"].cast(uchar_t
.pointer())
29 n_entries
= h
["n_direct_entries"]
30 n_buckets
= hashmap_type_info
[h
["type"]]["n_direct_buckets"]
32 t
= ["plain", "ordered", "set"][int(h
["type"])]
34 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"]}')
36 if arg
!= "" and n_entries
> 0:
37 dib_raw_addr
= storage_ptr
+ hashmap_type_info
[h
["type"]]["entry_size"] * n_buckets
40 for i
in range(0, n_buckets
):
41 dib
= int(dib_raw_addr
[i
])
42 histogram
[dib
] = histogram
.get(dib
, 0) + 1
44 for dib
in sorted(histogram
):
46 print(f
"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_entries):.0%} of entries")
48 print(f
"{dib:>3} {histogram[dib]:>8} {float(histogram[dib]/n_buckets):.0%} of slots")
49 s
= sum(dib
*count
for (dib
, count
) in histogram
.items() if dib
!= 255) / n_entries
50 print(f
"mean DIB of entries: {s}")
54 prev
= int(dib_raw_addr
[0])
55 for i
in range(1, n_buckets
):
56 dib
= int(dib_raw_addr
[i
])
57 if (dib
== 255) != (prev
== 255):
59 blocks
+= [[i
, current_len
]]
66 blocks
+= [[i
, current_len
]]
67 # a block may be wrapped around
68 if len(blocks
) > 1 and blocks
[0][0] == blocks
[0][1] and blocks
[-1][0] == n_buckets
- 1:
69 blocks
[0][1] += blocks
[-1][1]
71 print("max block: {}".format(max(blocks
, key
=lambda a
: a
[1])))
72 print("sum block lens: {}".format(sum(b
[1] for b
in blocks
)))
73 print("mean block len: {}".format(sum(b
[1] for b
in blocks
) / len(blocks
)))
75 d
= d
["debug_list_next"]