pps: Config tweaks to avoid loosing traces

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28058>

src/tool/pps/cfg/system.cfg

@@ -1,3 +1,16 @@
+# Enable periodic flushing of the trace buffer into the output file.
+write_into_file: true
+
+# Writes the userspace buffer into the file every .5 seconds.
+file_write_period_ms: 500
+
+# Commits the trace from the shared memory buffer to the central buffer
+# periodically. Otherwise, the --full-sort option will be required for
+# trace_processor_shell and traceconv when importing the trace.
+flush_period_ms: 2000
+
+duration_ms: 7000
+
 buffers {
   size_kb: 65536
   fill_policy: DISCARD
@@ -146,5 +159,3 @@ producers {
   shm_size_kb: 4096
   page_size_kb: 4
 }
-
-duration_ms: 7000