Top 100 inline functions (make allyesconfig) was Re: [ANNOUNCE] pahole and other DWARF2 utilities

Arnaldo Carvalho de Melo
2006-11-04T21:03:44Z

On Fri, Nov 03, 2006 at 04:07:29PM -0300, Arnaldo Carvalho de Melo wrote:
> On Mon, Oct 30, 2006 at 08:33:34PM -0800, Andrew Morton wrote:
> > On Mon, 30 Oct 2006 18:33:19 -0300
> > Arnaldo Carvalho de Melo <acme@mandriva.com> wrote:
> >
> > > Further ideas on how to use the DWARF2 information include tools
> > > that will show where inlines are being used, how much code is added by
> > > inline functions,
> >
> > It would be quite useful to be able to identify inlined functions which are
> > good candidates for uninlining.
>
> Top 50 inline functions expanded more than once by sum of its expansions
> in a vmlinux file built for qemu, most things are modules, columns are
> (inline function name, number of times it was expanded, sum in bytes of
> its expansions, number of source files where expansions ocurred):
>
> [acme@newtoy guinea_pig-2.6]$ pfunct --total_inline_stats
> ../../acme/OUTPUT/qemu/net-2.6/vmlinux | grep -v ': 1 ' | sort -k3 -nr |
> head -50
>
> get_current 676 5732 155

Ok, this time for a 'make allyesconfig' build, top 100, for the list of
all 6021 inline functions that were expanded more than once in this 281
MB vmlinux image download the 93 KB files at:

http://oops.merseine.nu:81/acme/vmlinux.allyesconfig.inlines.txt.gz

totsz = Total size of all expansions for this inline function
nrexp = Number of times this function was expanded (inlined)
avgsz = Average expansion size
nrsrc = number of source files where this function was expanded

Some cases are bogus due to namespace colisions, I'll work on mangling
the function name with the file where it was defined, but most should
be ok.

- Arnaldo

name totsz / nrexp = avgsz nrsrc
-------------------------------------------------------------
1 outb 65077 8180 7 505
2 __fswab16 58827 2313 25 459
3 __memcpy 54640 2241 24 1141
4 writel 49011 5989 8 364
5 __constant_c_and_count_memset 42967 3163 13 1708
6 skb_put 41512 741 56 416
7 kmalloc 38684 2345 16 1366
8 __constant_memcpy 35716 2536 14 1633
9 get_current 31233 4058 7 886
10 cfi_build_cmd 28439 131 217 7
11 strcmp 23324 1008 23 329
12 kzalloc 22413 1326 16 1014
13 current_thread_info 21816 2815 7 1319
14 readl 21575 3953 5 363
15 __constant_c_memset 21014 732 28 578
16 strcpy 20681 1420 14 611
17 __fswab32 19797 3566 5 442
18 init_hw 18441 7 2634 12
19 strncmp 18199 596 30 212
20 writeb 17825 2611 6 205
21 INIT_LIST_HEAD 15476 1713 9 746
22 __OUTPLL 15399 125 123 4
23 inb 15174 3246 4 499
24 snd_echo_create 15098 5 3019 5
25 NCR5380_information_transfer 14699 6 2449 6
26 __INPLL 14541 117 124 4
27 outw 14475 1437 10 135
28 up 14467 796 18 189
29 down 13710 396 34 152
30 do_write_buffer 13674 3 4558 3
31 pci_write_config_byte 13069 527 24 176
32 outb_p 12659 1241 10 97
33 strlen 12658 931 13 435
34 load_firmware 12616 7 1802 13
35 pci_read_config_byte 12369 560 22 218
36 cfi_send_gen_cmd 11559 41 281 5
37 module_put 11462 265 43 203
38 skb_push 11297 259 43 182
39 set_bit 11160 1296 8 676
40 readb 11015 1728 6 219
41 radeon_pll_errata_after_data 10855 127 85 4
42 skb_pull 10812 303 35 187
43 outl 10718 1151 9 128
44 netif_wake_queue 10355 348 29 173
45 add_timer 9896 390 25 252
46 pci_free_consistent 9834 376 26 130
47 clear_bit 9654 962 10 600
48 list_add_tail 9570 712 13 434
49 __fswab64 9553 521 18 97
50 ahd_outb 9538 295 32 4
51 hscx_int_main 9526 12 793 12
52 prefetch 9467 1764 5 720
53 pci_read_config_dword 9247 425 21 163
54 pci_write_config_dword 9116 402 22 140
55 dev_alloc_skb 9072 221 41 209
56 constant_test_bit 8764 1955 4 1034
57 dev_kfree_skb_irq 8617 98 87 104
58 writew 8569 1148 7 128
59 ahc_outb 8426 261 32 6
60 netif_stop_queue 8364 495 16 187
61 brelse 8354 822 10 155
62 skb_reserve 8187 444 18 320
63 ahc_inb 8182 303 27 6
64 pci_read_config_word 8174 359 22 178
65 skb_trim 8153 112 72 101
66 i_size_read 8071 181 44 67
67 list_del_init 7916 461 17 210
68 pci_map_single 7756 186 41 103
69 jedec_reset 7689 6 1281 1
70 WriteHSCXCMDR 7576 78 97 17
71 frontend_init 7352 7 1050 7
72 le_key_k_type 7302 60 121 12
73 pci_write_config_word 7123 284 25 137
74 dst_release 7059 125 56 71
75 ahd_set_modes 6930 55 126 4
76 strncpy 6651 296 22 153
77 usb_serial_debug_data 6380 61 104 25
78 pci_alloc_consistent 6352 214 29 129
79 atomic_inc 6235 1022 6 683
80 readw 6170 1001 6 122
81 block_til_ready 6146 10 614 10
82 load_dsp 6141 5 1228 12
83 test_and_set_bit 6096 605 10 394
84 try_module_get 6065 176 34 151
85 input_report_key 5939 208 28 65
86 load_module 5933 2 2966 2
87 usb_fill_bulk_urb 5846 114 51 62
88 skb_queue_head_init 5783 151 38 110
89 ahd_inb 5739 208 27 4
90 device_init 5689 2 2844 2
91 sctp_add_cmd_sf 5665 197 28 2
92 pci_set_drvdata 5595 496 11 268
93 skb_tailroom 5432 313 17 117
94 port_detect 5419 2 2709 2
95 dequeue_rx 5339 3 1779 3
96 dev_to_shost 5338 167 31 22
97 skb_header_pointer 5289 120 44 53
98 prism2_init_local_data 5226 3 1742 3
99 sb_bread 5216 164 31 87
100 strchr 5171 195 26 115