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+#!/usr/bin/perl -w
+#
+# range-perf	Extract a time range from Linux "perf script" output.
+#
+# USAGE EXAMPLE:
+#
+# perf record -F 100 -a -- sleep 60
+# perf script | ./perf2range.pl 10 20	# range 10 to 20 seconds only
+# perf script | ./perf2range.pl 0 0.5	# first half second only
+#
+# MAKING A SERIES OF FLAME GRAPHS:
+#
+# Let's say you had the output of "perf script" in a file, out.stacks01, which
+# was for a 180 second profile. The following command creates a series of
+# flame graphs for each 10 second interval:
+# 
+# for i in `seq 0 10 170`; do cat out.stacks01 | \
+#    ./perf2range.pl $i $((i + 10)) | ./stackcollapse-perf.pl | \
+#    grep -v cpu_idle | ./flamegraph.pl --hash --color=java \
+#    --title="range $i $((i + 10))" > out.range_$i.svg; echo $i done; done
+#
+# In that example, I used "--color=java" for the Java palette, and excluded
+# the idle CPU task. Customize as needed.
+#
+# Copyright 2017 Netflix, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License")
+#
+# 21-Feb-2017	Brendan Gregg	Created this.
+
+use strict;
+
+sub usage {
+	die <<USAGE_END;
+USAGE: $0 min_seconds max_seconds
+	eg,
+	$0 10 20	# only include samples between 10 and 20 seconds
+USAGE_END
+}
+
+if (@ARGV < 2 || $ARGV[0] eq "-h" || $ARGV[0] eq "--help") {
+	usage();
+	exit;
+}
+my $start = $ARGV[0];
+my $end = $ARGV[1];
+
+my $line;
+my $begin = 0;
+my $ok = 0;
+my ($cpu, $ts, $event);
+
+while (1) {
+	# skip comments
+
+	$line = <STDIN>;
+	last unless defined $line;
+	next if $line =~ /^#/;
+
+	#
+	# Parsing
+	#
+	# ip only examples:
+	# 
+	# java 52025 [026] 99161.926202: cycles: 
+	# java 14341 [016] 252732.474759: cycles:      7f36571947c0 nmethod::is_nmethod() const (/...
+	# java 14514 [022] 28191.353083: cpu-clock:      7f92b4fdb7d4 Ljava_util_List$size$0;::call (/tmp/perf-11936.map)
+	#
+	# stack examples (-g):
+	#
+	# swapper     0 [021] 28648.467059: cpu-clock: 
+	#	ffffffff810013aa xen_hypercall_sched_op ([kernel.kallsyms])
+	#	ffffffff8101cb2f default_idle ([kernel.kallsyms])
+	#	ffffffff8101d406 arch_cpu_idle ([kernel.kallsyms])
+	#	ffffffff810bf475 cpu_startup_entry ([kernel.kallsyms])
+	#	ffffffff81010228 cpu_bringup_and_idle ([kernel.kallsyms])
+	#
+	# java 14375 [022] 28648.467079: cpu-clock: 
+	#	    7f92bdd98965 Ljava/io/OutputStream;::write (/tmp/perf-11936.map)
+	#	    7f8808cae7a8 [unknown] ([unknown])
+	#
+	# swapper     0 [005]  5076.836336: cpu-clock: 
+	#	ffffffff81051586 native_safe_halt ([kernel.kallsyms])
+	#	ffffffff8101db4f default_idle ([kernel.kallsyms])
+	#	ffffffff8101e466 arch_cpu_idle ([kernel.kallsyms])
+	#	ffffffff810c2b31 cpu_startup_entry ([kernel.kallsyms])
+	#	ffffffff810427cd start_secondary ([kernel.kallsyms])
+	#
+	if ($line =~ / \d+ \[(\d+)\] +(\S+): (\S+):/) {
+		($cpu, $ts, $event) = ($1, $2, $3);
+		$begin = $ts if $begin == 0;
+
+		my $time = $ts - $begin;
+		$ok = 1 if $time >= $start;
+		exit if $time > $end;
+	}
+
+	print $line if $ok;
+}