perf script python: Add Python3 support to net_dropmonitor.py

Support both Python2 and Python3 in the net_dropmonitor.py script

There may be differences in the ordering of output lines due to
differences in dictionary ordering etc.  However the format within lines
should be unchanged.

The use of 'from __future__' implies the minimum supported Python2 version
is now v2.6

Signed-off-by: Tony Jones <tonyj@suse.de>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Link: http://lkml.kernel.org/r/20190222230619.17887-9-tonyj@suse.de
Signed-off-by: Seeteena Thoufeek <s1seetee@linux.vnet.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/scripts/python/net_dropmonitor.py b/tools/perf/scripts/python/net_dropmonitor.py
index a150164..212557a 100755 (executable)
--- a/tools/perf/scripts/python/net_dropmonitor.py
+++ b/tools/perf/scripts/python/net_dropmonitor.py
@@ -1,6 +1,8 @@
 # Monitor the system for dropped packets and proudce a report of drop locations and counts
 # SPDX-License-Identifier: GPL-2.0
 
+from __future__ import print_function
+
 import os
 import sys
 
@@ -50,19 +52,19 @@ def get_sym(sloc):
                return (None, 0)
 
 def print_drop_table():
-       print "%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT")
+       print("%25s %25s %25s" % ("LOCATION", "OFFSET", "COUNT"))
        for i in drop_log.keys():
                (sym, off) = get_sym(i)
                if sym == None:
                        sym = i
-               print "%25s %25s %25s" % (sym, off, drop_log[i])
+               print("%25s %25s %25s" % (sym, off, drop_log[i]))
 
 
 def trace_begin():
-       print "Starting trace (Ctrl-C to dump results)"
+       print("Starting trace (Ctrl-C to dump results)")
 
 def trace_end():
-       print "Gathering kallsyms data"
+       print("Gathering kallsyms data")
        get_kallsyms_table()
        print_drop_table()