perf script: Handle -i option for perf script flamegraph

If specify the perf data file with -i option, the script will try to
read the header information regardless of the file name specified,
instead it will try to access the perf.data. This simple patch use the
file name from -i option for command perf report --header-only to read
the header.

Signed-off-by: Tianyou Li <[email protected]>
Reviewed-by: Pan Deng <[email protected]>
Reviewed-by: Zhiguo Zhou <[email protected]>
Reviewed-by: Wangyang Guo <[email protected]>
Reviewed-by: Tim Chen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

Author: TianyouLi

tools/perf/scripts/python/flamegraph.py

@@ -123,7 +123,13 @@ def get_report_header(self):
             return ""
 
         try:
-            output = subprocess.check_output(["perf", "report", "--header-only"])
+            # if the file name other than perf.data is given,
+            # we read the header of that file
+            if self.args.input:
+                output = subprocess.check_output(["perf", "report", "--header-only", "-i", self.args.input])
+            else:
+                output = subprocess.check_output(["perf", "report", "--header-only"])
+
             return output.decode("utf-8")
         except Exception as err:  # pylint: disable=broad-except
             print("Error reading report header: {}".format(err), file=sys.stderr)