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 <tianyou.li@intel.com>
Reviewed-by: Pan Deng <pan.deng@intel.com>
Reviewed-by: Zhiguo Zhou <zhiguo.zhou@intel.com>
Reviewed-by: Wangyang Guo <wangyang.guo@intel.com>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Link: https://lore.kernel.org/r/20250610040536.2390060-1-tianyou.li@intel.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/tools/perf/scripts/python/flamegraph.py b/tools/perf/scripts/python/flamegraph.py
index cf7ce8229a6c..4f82dfea0a70 100755
--- a/tools/perf/scripts/python/flamegraph.py
+++ b/tools/perf/scripts/python/flamegraph.py
@@ -123,7 +123,13 @@ class FlameGraphCLI:
             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)