add script which measures stack consumption.
Current top users: 0x08052f52 uncompress []: 393312 0x080c8a58 input_tab []: 82104 0x08092d5b ifaddrlist []: 32828 0x08056163 loadfont_main []: 32796 0x0806e508 colon []: 16532 0x08056095 do_loadfont []: 16400 0x0806da70 place_cursor []: 16388 0x080792e8 login_main []: 9176 393 kb of stack??? OMG...
This commit is contained in:
Denis Vlasenko
parent
77e44d60e6
commit
d4fea900bd
@ -79,9 +79,13 @@ baseline: busybox_unstripped
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objsizes: busybox_unstripped
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$(srctree)/scripts/objsizes
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.PHONY: stksizes
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stksizes: busybox_unstripped
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$(CROSS_COMPILE)objdump -d busybox_unstripped | $(srctree)/scripts/checkstack.pl $(ARCH)
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.PHONY: bigdata
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bigdata: busybox_unstripped
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nm --size-sort busybox_unstripped | grep -vi ' [tr] ' | tail -20
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$(CROSS_COMPILE)nm --size-sort busybox_unstripped | grep -vi ' [tr] '
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# Documentation Targets
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.PHONY: doc
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@ -39,4 +39,6 @@ help:
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@echo ' release - create a distribution tarball'
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@echo ' sizes - show size of all enabled busybox symbols'
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@echo ' objsizes - show size of each .o object built'
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@echo ' bigdata - show data objects, biggest first'
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@echo ' stksizes - show stack users, biggest first'
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@echo
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137
scripts/checkstack.pl
Executable file
137
scripts/checkstack.pl
Executable file
@ -0,0 +1,137 @@
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#!/usr/bin/perl
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# Stolen from Linux kernel :)
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# Check the stack usage of functions
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#
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# Copyright Joern Engel <joern@wh.fh-wedel.de>
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# Inspired by Linus Torvalds
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# Original idea maybe from Keith Owens
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# s390 port and big speedup by Arnd Bergmann <arnd@bergmann-dalldorf.de>
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# Mips port by Juan Quintela <quintela@mandrakesoft.com>
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# IA64 port via Andreas Dilger
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# Arm port by Holger Schurig
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# sh64 port by Paul Mundt
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# Random bits by Matt Mackall <mpm@selenic.com>
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# M68k port by Geert Uytterhoeven and Andreas Schwab
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#
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# Usage:
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# objdump -d vmlinux | checkstack.pl [arch]
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#
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# TODO : Port to all architectures (one regex per arch)
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# check for arch
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#
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# $re is used for two matches:
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# $& (whole re) matches the complete objdump line with the stack growth
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# $1 (first bracket) matches the size of the stack growth
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#
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# use anything else and feel the pain ;)
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my (@stack, $re, $x, $xs);
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{
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my $arch = shift;
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if ($arch eq "") {
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$arch = `uname -m`;
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}
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$x = "[0-9a-f]"; # hex character
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$xs = "[0-9a-f ]"; # hex character or space
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if ($arch eq 'arm') {
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#c0008ffc: e24dd064 sub sp, sp, #100 ; 0x64
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$re = qr/.*sub.*sp, sp, #(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch =~ /^i[3456]86$/) {
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#c0105234: 81 ec ac 05 00 00 sub $0x5ac,%esp
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$re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%esp$/o;
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} elsif ($arch eq 'x86_64') {
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# 2f60: 48 81 ec e8 05 00 00 sub $0x5e8,%rsp
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$re = qr/^.*[as][du][db] \$(0x$x{1,8}),\%rsp$/o;
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} elsif ($arch eq 'ia64') {
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#e0000000044011fc: 01 0f fc 8c adds r12=-384,r12
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$re = qr/.*adds.*r12=-(([0-9]{2}|[3-9])[0-9]{2}),r12/o;
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} elsif ($arch eq 'm68k') {
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# 2b6c: 4e56 fb70 linkw %fp,#-1168
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# 1df770: defc ffe4 addaw #-28,%sp
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$re = qr/.*(?:linkw %fp,|addaw )#-([0-9]{1,4})(?:,%sp)?$/o;
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} elsif ($arch eq 'mips64') {
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#8800402c: 67bdfff0 daddiu sp,sp,-16
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$re = qr/.*daddiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'mips') {
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#88003254: 27bdffe0 addiu sp,sp,-32
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$re = qr/.*addiu.*sp,sp,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch eq 'ppc') {
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#c00029f4: 94 21 ff 30 stwu r1,-208(r1)
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$re = qr/.*stwu.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch eq 'ppc64') {
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#XXX
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$re = qr/.*stdu.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch eq 'powerpc') {
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$re = qr/.*st[dw]u.*r1,-($x{1,8})\(r1\)/o;
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} elsif ($arch =~ /^s390x?$/) {
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# 11160: a7 fb ff 60 aghi %r15,-160
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$re = qr/.*ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2})/o;
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} elsif ($arch =~ /^sh64$/) {
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#XXX: we only check for the immediate case presently,
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# though we will want to check for the movi/sub
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# pair for larger users. -- PFM.
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#a00048e0: d4fc40f0 addi.l r15,-240,r15
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$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
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} else {
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print("wrong or unknown architecture\n");
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exit
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}
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}
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sub bysize($) {
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my ($asize, $bsize);
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($asize = $a) =~ s/.*: *(.*)$/$1/;
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($bsize = $b) =~ s/.*: *(.*)$/$1/;
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$bsize <=> $asize
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}
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#
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# main()
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#
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my $funcre = qr/^$x* <(.*)>:$/;
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my $func;
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my $file, $lastslash;
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while (my $line = <STDIN>) {
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if ($line =~ m/$funcre/) {
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$func = $1;
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}
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elsif ($line =~ m/(.*):\s*file format/) {
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$file = $1;
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$file =~ s/\.ko//;
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$lastslash = rindex($file, "/");
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if ($lastslash != -1) {
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$file = substr($file, $lastslash + 1);
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}
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}
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elsif ($line =~ m/$re/) {
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my $size = $1;
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$size = hex($size) if ($size =~ /^0x/);
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if ($size > 0xf0000000) {
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$size = - $size;
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$size += 0x80000000;
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$size += 0x80000000;
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}
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next if ($size > 0x10000000);
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next if $line !~ m/^($xs*)/;
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my $addr = $1;
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$addr =~ s/ /0/g;
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$addr = "0x$addr";
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my $intro = "$addr $func [$file]:";
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my $padlen = 56 - length($intro);
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while ($padlen > 0) {
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$intro .= ' ';
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$padlen -= 8;
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}
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next if ($size < 100);
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push @stack, "$intro$size\n";
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}
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}
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print sort bysize @stack;
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