[PATCH] perf flamegraph: explicitly set utf-8 encoding

[Andreas Gerstmayr <agerstmayr@redhat.com>]

on some platforms the default encoding is not utf-8,
which causes an UnicodeDecodeError when reading the flamegraph template

Signed-off-by: Andreas Gerstmayr <agerstmayr@redhat.com>
---
Tested with Python 2.7 and 3.

 tools/perf/scripts/python/flamegraph.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/scripts/python/flamegraph.py b/tools/perf/scripts/python/flamegraph.py
index 61f3be9add6b..8979db910a8f 100755
--- a/tools/perf/scripts/python/flamegraph.py
+++ b/tools/perf/scripts/python/flamegraph.py
@@ -17,6 +17,7 @@
 from __future__ import print_function
 import sys
 import os
+import io
 import argparse
 import json
 
@@ -81,7 +82,7 @@ class FlameGraphCLI:
 
         if self.args.format == "html":
             try:
-                with open(self.args.template) as f:
+                with io.open(self.args.template, encoding="utf-8") as f:
                     output_str = f.read().replace("/** @flamegraph_json **/",
                                                   json_str)
             except IOError as e:
@@ -97,7 +98,7 @@ class FlameGraphCLI:
         else:
             print("dumping data to {}".format(output_fn))
             try:
-                with open(output_fn, "w") as out:
+                with io.open(output_fn, "w", encoding="utf-8") as out:
                     out.write(output_str)
             except IOError as e:
                 print("Error writing output file: {}".format(e), file=sys.stderr)
-- 
2.25.4