I noticed that the 2.1.29 kernel image is much bigger than the 2.0.29
image. To check it out I wrote a small perl script to compare
"nm --size-sort -t d" listings. It only gives a rough estimate of course
but it is still a useful bloat-o-meter.
Here is some data from a 2.0.29-2.1.29 comparison. It was generated
by sizean 2.0.29-map 2.1.29-map | grep -v new |sort -n +3:
Symbol Old size New size Delta Change
SHATransform 00006796 00000364 -6432 -94.6439
[ A good guy :) ]
[...]
add_timer 00000052 00000352 300 +576.923
sys_init_module 00001028 00001328 300 +29.1828
create_aout_tables 00000208 00000516 308 +148.076
ncr_getclock 00000216 00000528 312 +144.444
raw_sendto 00000392 00000712 320 +81.6326
udp_err 00000212 00000532 320 +150.943
unix_bind 00000332 00000656 324 +97.5903
ip_getsockopt 00000864 00001200 336 +38.8888
locks_mandatory_area 00000004 00000344 340 +8500
sys_olduname 00000164 00000504 340 +207.317
get_module_list 00000436 00000784 348 +79.8165
arp_req_set 00000732 00001088 356 +48.6338
igmp_send_report 00000220 00000584 364 +165.454
ncr_init 00000996 00001388 392 +39.3574
ncr_complete 00001280 00001680 400 +31.25
set_multicast_list 00000060 00000476 416 +693.333
read_zero 00000060 00000524 464 +773.333
ip_rt_event 00000056 00000540 484 +864.285
timer_bh 00000332 00000824 492 +148.192
fd_ioctl 00003108 00003604 496 +15.9588
udp_sendto 00000232 00000832 600 +258.620
ip_setsockopt 00001472 00002080 608 +41.3043
sock_getsockopt 00000432 00001044 612 +141.666
ip_rt_redirect 00000336 00001016 680 +202.380
ncr_attach 00001288 00001988 700 +54.3478
ip_rt_ioctl 00000164 00000892 728 +443.902
ppp_tty_ioctl 00002200 00002936 736 +33.4545
vt_ioctl 00006980 00009248 2268 +32.4928
[ Not sure where this comes from. I hope a few s/get_user/__get_user/
and s/put_user/__put_user/ will help. ]
ext2_sync_file 00000164 00003092 2928 +1785.36
[ This can be easily fixed for little endian machines. ]
rp_sidt 00000025 00003625 3600 +14400
The big increase in the _ioctl() functions seem to suggest that the
new _user() user memory access primitives generate much more code
than the 2.0 routines.
Here is the sizean script:
#!/usr/bin/perl
# - bloat-o-meter -
# by Andi Kleen
# f1 and f2 are nm --size-sort -t d x.o files
die "usage: $0 file1 file2\n" if $#ARGV < 1 || $#ARGV>2;
open(F1,"<$ARGV[0]") || die "cannot open $AGRV[0] ($!)\n";
open(F2,"<$ARGV[1]") || die "cannot open $ARGV[1] ($!)\n";
while (<F1>) {
($size, $type, $name) = split;
if ($type !~ /[tT]/) { next; }
$t1{$name} = $size;
}
while(<F2>) {
($size, $type, $name) = split;
next if $type !~ /[tT]/;
if (defined $t1{$name}) {
$olds=$t1{$name};
next if $olds == $size; # only changed sizes
$delta = $size-$olds;
$change = (($size-$old)/($olds == 0 ? 1 : $olds))*100-100;
$change=($change>0 ? "+":"") . "$change";
write;
} else {
$olds = "(new)";
$delta = $size;
$change = "";
write;
}
}
format STDOUT_TOP =
Symbol Old size New size Delta Change
.
format STDOUT =
@<<<<<<<<<<<<<<<<<<<<<<<<<<<<< @<<<<<<< @<<<<<<< @<<<<<<< @<<<<<<<
$name $olds $size $delta $change
.
-Andi