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Linux/scripts/stackdelta

  1 #!/usr/bin/perl
  2 
  3 # Read two files produced by the stackusage script, and show the
  4 # delta between them.
  5 #
  6 # Currently, only shows changes for functions listed in both files. We
  7 # could add an option to show also functions which have vanished or
  8 # appeared (which would often be due to gcc making other inlining
  9 # decisions).
 10 #
 11 # Another possible option would be a minimum absolute value for the
 12 # delta.
 13 #
 14 # A third possibility is for sorting by delta, but that can be
 15 # achieved by piping to sort -k5,5g.
 16 
 17 sub read_stack_usage_file {
 18     my %su;
 19     my $f = shift;
 20     open(my $fh, '<', $f)
 21         or die "cannot open $f: $!";
 22     while (<$fh>) {
 23         chomp;
 24         my ($file, $func, $size, $type) = split;
 25         # Old versions of gcc (at least 4.7) have an annoying quirk in
 26         # that a (static) function whose name has been changed into
 27         # for example ext4_find_unwritten_pgoff.isra.11 will show up
 28         # in the .su file with a name of just "11". Since such a
 29         # numeric suffix is likely to change across different
 30         # commits/compilers/.configs or whatever else we're trying to
 31         # tweak, we can't really track those functions, so we just
 32         # silently skip them.
 33         #
 34         # Newer gcc (at least 5.0) report the full name, so again,
 35         # since the suffix is likely to change, we strip it.
 36         next if $func =~ m/^[0-9]+$/;
 37         $func =~ s/\..*$//;
 38         # Line numbers are likely to change; strip those.
 39         $file =~ s/:[0-9]+$//;
 40         $su{"${file}\t${func}"} = {size => $size, type => $type};
 41     }
 42     close($fh);
 43     return \%su;
 44 }
 45 
 46 @ARGV == 2
 47     or die "usage: $0 <old> <new>";
 48 
 49 my $old = read_stack_usage_file($ARGV[0]);
 50 my $new = read_stack_usage_file($ARGV[1]);
 51 my @common = sort grep {exists $new->{$_}} keys %$old;
 52 for (@common) {
 53     my $x = $old->{$_}{size};
 54     my $y = $new->{$_}{size};
 55     my $delta = $y - $x;
 56     if ($delta) {
 57         printf "%s\t%d\t%d\t%+d\n", $_, $x, $y, $delta;
 58     }
 59 }

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