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