perf testsuite: Add common output checking helpers

As a form of validation, it is a common practice to check the outputs
of commands whether they contain expected patterns or match a certain
regex.

Add helpers for verifying that all regexes are found in the output, that
all lines match any pattern from a set and that a certain expression is
not present in the output.

In verbose mode these helpers log mismatches for easier failure
investigation.

Signed-off-by: Veronika Molnarova <[e-mail]>
Signed-off-by: Michael Petlan <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

tools/perf/tests/shell/common/check_all_lines_matched.pl

···
+#!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0
+
+@regexps = @ARGV;
+
+$max_printed_lines = 20;
+$max_printed_lines = $ENV{TESTLOG_ERR_MSG_MAX_LINES} if (defined $ENV{TESTLOG_ERR_MSG_MAX_LINES});
+
+$quiet = 1;
+$quiet = 0 if (defined $ENV{TESTLOG_VERBOSITY} && $ENV{TESTLOG_VERBOSITY} ge 2);
+
+$passed = 1;
+$lines_printed = 0;
+
+while (<STDIN>)
+{
+	s/\n//;
+
+	$line_matched = 0;
+	for $r (@regexps)
+	{
+		if (/$r/)
+		{
+			$line_matched = 1;
+			last;
+		}
+	}
+
+	unless ($line_matched)
+	{
+		if ($lines_printed++ < $max_printed_lines)
+		{
+			print "Line did not match any pattern: \"$_\"\n" unless $quiet;
+		}
+		$passed = 0;
+	}
+}
+
+exit ($passed == 0);

tools/perf/tests/shell/common/check_all_patterns_found.pl

···
+#!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0
+
+@regexps = @ARGV;
+
+$quiet = 1;
+$quiet = 0 if (defined $ENV{TESTLOG_VERBOSITY} && $ENV{TESTLOG_VERBOSITY} ge 2);
+
+%found = ();
+$passed = 1;
+
+while (<STDIN>)
+{
+	s/\n//;
+
+	for $r (@regexps)
+	{
+		if (/$r/)
+		{
+			$found{$r} = 1;	# FIXME: maybe add counters -- how many times was the regexp matched
+		}
+	}
+}
+
+for $r (@regexps)
+{
+	unless (exists $found{$r})
+	{
+		print "Regexp not found: \"$r\"\n" unless $quiet;
+		$passed = 0;
+	}
+}
+
+exit ($passed == 0);

tools/perf/tests/shell/common/check_no_patterns_found.pl

···
+#!/usr/bin/perl
+# SPDX-License-Identifier: GPL-2.0
+
+@regexps = @ARGV;
+
+$quiet = 1;
+$quiet = 0 if (defined $ENV{TESTLOG_VERBOSITY} && $ENV{TESTLOG_VERBOSITY} ge 2);
+
+%found = ();
+$passed = 1;
+
+while (<STDIN>)
+{
+	s/\n//;
+
+	for $r (@regexps)
+	{
+		if (/$r/)
+		{
+			$found{$r} = 1;
+		}
+	}
+}
+
+for $r (@regexps)
+{
+	if (exists $found{$r})
+	{
+		print "Regexp found: \"$r\"\n" unless $quiet;
+		$passed = 0;
+	}
+}
+
+exit ($passed == 0);