perfetto_simple_producer: Mention permissions issue in the instructions
BUG=b:212218972
TEST=None
Change-Id: I561dadb80e7a14d464ecb0b866f390dacf2f5559
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform2/+/3360458
Tested-by: Wei Lee <wtlee@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Reviewed-by: Cheng-Hao Yang <chenghaoyang@chromium.org>
Commit-Queue: Wei Lee <wtlee@chromium.org>
diff --git a/perfetto_simple_producer/README.md b/perfetto_simple_producer/README.md
index 8973ff5..021135d 100644
--- a/perfetto_simple_producer/README.md
+++ b/perfetto_simple_producer/README.md
@@ -45,4 +45,5 @@
4. Collect the trace at `/tmp/perfetto-trace`. It can be uploaded to the
[perfetto UI website](https://ui.perfetto.dev) and check if there are 4 tracks on the corresponding
- threads.
+ threads. And note that when uploading the file please make sure the file is
+ readable by user `chronos`. Otherwise, the site will throw an error.
