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git.proxmox.com Git - systemd.git/blob - tools/gdb-sd_dump_hashmaps.py
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2 # -*- Mode: python; coding: utf-8; indent-tabs-mode: nil -*- */
3 # SPDX-License-Identifier: LGPL-2.1+
7 class sd_dump_hashmaps(gdb
.Command
):
8 "dump systemd's hashmaps"
11 super(sd_dump_hashmaps
, self
).__init
__("sd_dump_hashmaps", gdb
.COMMAND_DATA
, gdb
.COMPLETE_NONE
)
13 def invoke(self
, arg
, from_tty
):
14 d
= gdb
.parse_and_eval("hashmap_debug_list")
15 all_entry_sizes
= gdb
.parse_and_eval("all_entry_sizes")
16 all_direct_buckets
= gdb
.parse_and_eval("all_direct_buckets")
17 hashmap_base_t
= gdb
.lookup_type("HashmapBase")
18 uchar_t
= gdb
.lookup_type("unsigned char")
19 ulong_t
= gdb
.lookup_type("unsigned long")
20 debug_offset
= gdb
.parse_and_eval("(unsigned long)&((HashmapBase*)0)->debug")
22 print "type, hash, indirect, entries, max_entries, buckets, creator"
24 h
= gdb
.parse_and_eval("(HashmapBase*)((char*)%d - %d)" % (int(d
.cast(ulong_t
)), debug_offset
))
27 storage_ptr
= h
["indirect"]["storage"].cast(uchar_t
.pointer())
28 n_entries
= h
["indirect"]["n_entries"]
29 n_buckets
= h
["indirect"]["n_buckets"]
31 storage_ptr
= h
["direct"]["storage"].cast(uchar_t
.pointer())
32 n_entries
= h
["n_direct_entries"]
33 n_buckets
= all_direct_buckets
[int(h
["type"])];
35 t
= ["plain", "ordered", "set"][int(h
["type"])]
37 print "{}, {}, {}, {}, {}, {}, {} ({}:{})".format(t
, h
["hash_ops"], bool(h
["has_indirect"]), n_entries
, d
["max_entries"], n_buckets
, d
["func"], d
["file"], d
["line"])
39 if arg
!= "" and n_entries
> 0:
40 dib_raw_addr
= storage_ptr
+ (all_entry_sizes
[h
["type"]] * n_buckets
)
43 for i
in xrange(0, n_buckets
):
44 dib
= int(dib_raw_addr
[i
])
45 histogram
[dib
] = histogram
.get(dib
, 0) + 1
47 for dib
in sorted(iter(histogram
)):
49 print "{:>3} {:>8} {} of entries".format(dib
, histogram
[dib
], 100.0*histogram
[dib
]/n_entries
)
51 print "{:>3} {:>8} {} of slots".format(dib
, histogram
[dib
], 100.0*histogram
[dib
]/n_buckets
)
52 print "mean DIB of entries: {}".format(sum([dib
*histogram
[dib
] for dib
in iter(histogram
) if dib
!= 255])*1.0/n_entries
)
56 prev
= int(dib_raw_addr
[0])
57 for i
in xrange(1, n_buckets
):
58 dib
= int(dib_raw_addr
[i
])
59 if (dib
== 255) != (prev
== 255):
61 blocks
+= [[i
, current_len
]]
68 blocks
+= [[i
, current_len
]]
69 # a block may be wrapped around
70 if len(blocks
) > 1 and blocks
[0][0] == blocks
[0][1] and blocks
[-1][0] == n_buckets
- 1:
71 blocks
[0][1] += blocks
[-1][1]
73 print "max block: {}".format(max(blocks
, key
=lambda a
: a
[1]))
74 print "sum block lens: {}".format(sum(b
[1] for b
in blocks
))
75 print "mean block len: {}".format((1.0 * sum(b
[1] for b
in blocks
) / len(blocks
)))
77 d
= d
["debug_list_next"]