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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061#!/usr/bin/env perl# SPDX-License-Identifier: GPL-2.0
# Read two files produced by the stackusage script, and show the# delta between them.## Currently, only shows changes for functions listed in both files. We# could add an option to show also functions which have vanished or# appeared (which would often be due to gcc making other inlining# decisions).## Another possible option would be a minimum absolute value for the# delta.## A third possibility is for sorting by delta, but that can be# achieved by piping to sort -k5,5g.
sub read_stack_usage_file { my %su; my $f = shift; open(my $fh, '<', $f) or die "cannot open $f: $!"; while (<$fh>) { chomp; my ($file, $func, $size, $type) = split; # Old versions of gcc (at least 4.7) have an annoying quirk in # that a (static) function whose name has been changed into # for example ext4_find_unwritten_pgoff.isra.11 will show up # in the .su file with a name of just "11". Since such a # numeric suffix is likely to change across different # commits/compilers/.configs or whatever else we're trying to # tweak, we can't really track those functions, so we just # silently skip them. # # Newer gcc (at least 5.0) report the full name, so again, # since the suffix is likely to change, we strip it. next if $func =~ m/^[0-9]+$/; $func =~ s/\..*$//; # Line numbers are likely to change; strip those. $file =~ s/:[0-9]+$//; $su{"${file}\t${func}"} = {size => $size, type => $type}; } close($fh); return \%su;}
@ARGV == 2 or die "usage: $0 <old> <new>";
my $old = read_stack_usage_file($ARGV[0]);my $new = read_stack_usage_file($ARGV[1]);my @common = sort grep {exists $new->{$_}} keys %$old;for (@common) { my $x = $old->{$_}{size}; my $y = $new->{$_}{size}; my $delta = $y - $x; if ($delta) { printf "%s\t%d\t%d\t%+d\n", $_, $x, $y, $delta; }}