Revision beaeb4f39bc31d5a5eb6d05465a86af4fe147732 authored by Linus Torvalds on 21 September 2020, 15:53:48 UTC, committed by Linus Torvalds on 21 September 2020, 15:53:48 UTC
Pull kvm fixes from Paolo Bonzini: "ARM: - fix fault on page table writes during instruction fetch s390: - doc improvement x86: - The obvious patches are always the ones that turn out to be completely broken. /me hangs his head in shame" * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: Revert "KVM: Check the allocation of pv cpu mask" KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite() KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch docs: kvm: add documentation for KVM_CAP_S390_DIAG318
stackdelta
#!/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;
}
}
Computing file changes ...