linux-kernel - Re: [PATCH 4/6] tracing, page-allocator: Add a postprocessing script for page-allocator-related ftrace events

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Date:	Fri, 7 Aug 2009 12:10:05 -0700 (PDT)
From:	"Li, Ming Chun" <macli@....ubc.ca>
To:	Mel Gorman <mel@....ul.ie>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 4/6] tracing, page-allocator: Add a postprocessing script
 for page-allocator-related ftrace events

On Fri, 7 Aug 2009, Mel Gorman wrote:

> +sub generate_traceevent_regex {
> +	my $event = shift;
> +	my $default = shift;
> +	my @fields = @_;
> +	my $regex;

You are using shift to retrieve parameters below, @fields is not used 
anywhere.

> +
> +	# Read the event format or use the default
> +	if (!open (FORMAT, "/sys/kernel/debug/tracing/events/$event/format")) {
> +		$regex = $default;
> +	} else {
> +		my $line;
> +		while (!eof(FORMAT)) {
> +			$line = <FORMAT>;
> +			if ($line =~ /^print fmt:\s"(.*)",.*/) {
> +				$regex = $1;
> +				$regex =~ s/%p/\([0-9a-f]*\)/g;
> +				$regex =~ s/%d/\([-0-9]*\)/g;
> +				$regex =~ s/%lu/\([0-9]*\)/g;
> +			}
> +		}
> +	}
> +
> +	# Verify fields are in the right order
> +	my $tuple;
> +	foreach $tuple (split /\s/, $regex) {
> +		my ($key, $value) = split(/=/, $tuple);
> +		my $expected = shift;
> +		if ($key ne $expected) {
> +			print("WARNING: Format not as expected '$key' != '$expected'");
> +			$regex =~ s/$key=\((.*)\)/$key=$1/;
> +		}
> +	}
> +	if (defined $_) {
> +		die("Fewer fields than expected in format");
> +	}
> +

How about:
	if (defined shift) {
		die("Fewer fields than expected in format");
	}
? 

I don't know, just ask if it is clear.

> +	return $regex;
> +}


Vincent Li
Biomedical Research Center
University of British Columbia
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