Feather-Trace: keep track of PID in trace record

To properly trace locking overheads, it is required to tell apart
samples from different tasks, which requires keeping track of their
PIDs.

The timestamp is shortened to 48 bits to make room for the PID.

1 files changed, 2 insertions, 1 deletions

diff --git a/include/litmus/trace.h b/include/litmus/trace.h
index e809376d6487..7efced0c3078 100644
--- a/include/litmus/trace.h
+++ b/include/litmus/trace.h
@@ -16,7 +16,8 @@ enum task_type_marker {
 };
 
 struct timestamp {
-        uint64_t                timestamp;
+        uint64_t                timestamp:48;
+        uint64_t                pid:16;
         uint32_t                seq_no;
         uint8_t                 cpu;
         uint8_t                 event;