From 1e482f0862892397ece890290cc479fbe9ed3e21 Mon Sep 17 00:00:00 2001
From: adilger <adilger>
Date: Wed, 12 Mar 2003 00:58:12 +0000
Subject: [PATCH] Script to grab asm output and look for heavy stack (ab)users.
 Could be improved a bit by having it take a list of files as args and running
 objdump and then preceding each line with the filename, so we can run it on
 modules more easily than having a shell script call a perl script...

---
 lustre/tests/checkstack.pl | 92 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 lustre/tests/checkstack.pl

diff --git a/lustre/tests/checkstack.pl b/lustre/tests/checkstack.pl
new file mode 100644
index 0000000..9c0d097
--- /dev/null
+++ b/lustre/tests/checkstack.pl
@@ -0,0 +1,92 @@
+#!/usr/bin/perl
+
+#	Check the stack usage of functions
+#
+#	Copyright Joern Engel <joern@wh.fh-wedel.de>
+#	Inspired by Linus Torvalds
+#	Original idea maybe from Keith Owens
+#
+#	Usage:
+#	objdump -d vmlinux | checkstack.pl <arch>
+#
+#	find <moduledir> -name "*.o" | while read M; do
+#		objdump -d $M | perl ~/checkstack.pl <arch> | \
+#			sed "s/^/`basename $M`: /" ; done | \
+#	awk '/esp/ { print $5, $2, $4 }' | sort -nr
+#
+#	TODO :	Port to all architectures (one regex per arch)
+#		Speed this puppy up
+
+# check for arch
+# 
+# $re is used for three matches:
+# $& (whole re) matches the complete objdump line with the stack growth
+# $1 (first bracket) matches the code that will be displayed in the output
+# $2 (second bracket) matches the size of the stack growth
+#
+# use anything else and feel the pain ;)
+{
+	my $arch = shift;
+	$x	= "[0-9a-f]";	# hex character
+	$xs	= "[0-9a-f ]";	# hex character or space
+	if ($arch =~ /^i[3456]86$/) {
+		#c0105234:       81 ec ac 05 00 00       sub    $0x5ac,%esp
+		$re = qr/^.*(sub/s\$(0x$x{3,5}),\%esp)$/o;
+	} elsif ($arch =~ /^ia64$/) {
+		#                                        adds r12=-384,r12
+		$re = qr/.*(adds/sr12=-($x{3,5}),r12)/o;
+	} elsif ($arch =~ /^ppc$/) {
+		#c00029f4:       94 21 ff 30     stwu    r1,-208(r1)
+		$re = qr/.*(stwu/sr1,-($x{3,5})\(r1\))/o;
+	} elsif ($arch =~ /^s390x?$/) {
+		#   11160:       a7 fb ff 60             aghi   %r15,-160
+		$re = qr/.*(ag?hi.*\%r15,-(([0-9]{2}|[3-9])[0-9]{2}))/o;
+	} else {
+		print("wrong or unknown architecture\n");
+		exit
+	}
+}
+
+sub bysize($) {
+	($asize = $a) =~ s/$re/\2/;
+	($bsize = $b) =~ s/$re/\2/;
+	$bsize <=> $asize
+}
+
+#
+# main()
+#
+$funcre = qr/^$x* \<(.*)\>:$/;
+while ($line = <STDIN>) {
+	if ($line =~ m/$funcre/) {
+		($func = $line) =~ s/$funcre/\1/;
+		chomp($func);
+	}
+
+	if ($line =~ m/$re/) {
+		(my $addr = $line) =~ s/^($xs{8}).*/0x\1/o;
+		chomp($addr);
+
+		my $intro = "$addr $func:";
+		my $padlen = 56 - length($intro);
+		while ($padlen > 0) {
+			$intro .= '	';
+			$padlen -= 8;
+		}
+		(my $code = $line) =~ s/$re/\1/;
+
+		$stack[@stack] = "$intro $code";
+	}
+}
+
+@sortedstack = sort bysize @stack;
+
+foreach $i (@sortedstack) {
+	print("$i");
+}
+--
+Andreas Dilger
+http://sourceforge.net/projects/ext2resize/
+http://www-mddsp.enel.ucalgary.ca/People/adilger/
+
+
-- 
1.8.3.1