perf scripts python: Add Python 3 support to sched-migration.py

Support both Python 2 and Python 3 in the sched-migration.py script.
This should have no functional change.

Signed-off-by: Jeremy Cline <jeremy@jcline.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Herton Krzesinski <herton@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/0100016341a737a5-44ec436f-3440-4cac-a03f-ddfa589bf308-000000@email.amazonses.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/scripts/python/sched-migration.py b/tools/perf/scripts/python/sched-migration.py
index de66cb3..3473e7f 100644 (file)
--- a/tools/perf/scripts/python/sched-migration.py
+++ b/tools/perf/scripts/python/sched-migration.py
@@ -9,13 +9,17 @@
 # This software is distributed under the terms of the GNU General
 # Public License ("GPL") version 2 as published by the Free Software
 # Foundation.
-
+from __future__ import print_function
 
 import os
 import sys
 
 from collections import defaultdict
-from UserList import UserList
+try:
+    from UserList import UserList
+except ImportError:
+    # Python 3: UserList moved to the collections package
+    from collections import UserList
 
 sys.path.append(os.environ['PERF_EXEC_PATH'] + \
        '/scripts/python/Perf-Trace-Util/lib/Perf/Trace')
@@ -300,7 +304,7 @@ class TimeSliceList(UserList):
                if i == -1:
                        return
 
-               for i in xrange(i, len(self.data)):
+               for i in range(i, len(self.data)):
                        timeslice = self.data[i]
                        if timeslice.start > end:
                                return
@@ -336,8 +340,8 @@ class SchedEventProxy:
                on_cpu_task = self.current_tsk[headers.cpu]
 
                if on_cpu_task != -1 and on_cpu_task != prev_pid:
-                       print "Sched switch event rejected ts: %s cpu: %d prev: %s(%d) next: %s(%d)" % \
-                               (headers.ts_format(), headers.cpu, prev_comm, prev_pid, next_comm, next_pid)
+                       print("Sched switch event rejected ts: %s cpu: %d prev: %s(%d) next: %s(%d)" % \
+                               headers.ts_format(), headers.cpu, prev_comm, prev_pid, next_comm, next_pid)
 
                threads[prev_pid] = prev_comm
                threads[next_pid] = next_comm