locking: trace system call entry/exit cost

2 files changed, 40 insertions, 0 deletions

diff --git a/litmus/locking.c b/litmus/locking.c
index 728b56835cf7..cfbc1ba59217 100644
--- a/litmus/locking.c
+++ b/litmus/locking.c
@@ -1,3 +1,5 @@
+#include <linux/sched.h>
+#include <litmus/litmus.h>
 #include <litmus/fdso.h>
 
 #ifdef CONFIG_LITMUS_LOCKING
@@ -69,6 +71,11 @@ asmlinkage long sys_litmus_lock(int lock_od)
         struct od_table_entry* entry;
         struct litmus_lock* l;
 
+        if (has_control_page(current))
+                TS_SYSCALL_IN_START(&get_control_page(current)->ts_syscall_start);
+
+        TS_SYSCALL_IN_END;
+
         TS_LOCK_START;
 
         entry = get_entry_for_od(lock_od);
@@ -82,6 +89,8 @@ asmlinkage long sys_litmus_lock(int lock_od)
          * this into account when computing overheads. */
         TS_UNLOCK_END;
 
+        TS_SYSCALL_OUT_START;
+
         return err;
 }
 
@@ -91,6 +100,11 @@ asmlinkage long sys_litmus_unlock(int lock_od)
         struct od_table_entry* entry;
         struct litmus_lock* l;
 
+        if (has_control_page(current))
+                TS_SYSCALL_IN_START(&get_control_page(current)->ts_syscall_start);
+
+        TS_SYSCALL_IN_END;
+
         TS_UNLOCK_START;
 
         entry = get_entry_for_od(lock_od);
@@ -104,6 +118,8 @@ asmlinkage long sys_litmus_unlock(int lock_od)
          * account when computing overheads. */
         TS_UNLOCK_END;
 
+        TS_SYSCALL_OUT_START;
+
         return err;
 }
 
diff --git a/litmus/trace.c b/litmus/trace.c
index e7ea1c2ab3e4..23763c19fa6b 100644
--- a/litmus/trace.c
+++ b/litmus/trace.c
@@ -37,6 +37,30 @@ static inline void __save_timestamp(unsigned long event,
         __save_timestamp_cpu(event, type, raw_smp_processor_id());
 }
 
+static inline uint8_t task_type(struct task_struct* t)
+{
+        if (!t)
+                return TSK_UNKNOWN;
+        else
+                return is_realtime(t) ? TSK_RT : TSK_BE;
+}
+
+feather_callback void save_timestamp_time(unsigned long event, unsigned long ptr)
+{
+        uint64_t* time = (uint64_t*) ptr;
+        unsigned int seq_no;
+        struct timestamp *ts;
+        seq_no = fetch_and_inc((int *) &ts_seq_no);
+        if (ft_buffer_start_write(trace_ts_buf, (void**)  &ts)) {
+                ts->event     = event;
+                ts->timestamp = *time;
+                ts->seq_no    = seq_no;
+                ts->cpu       = raw_smp_processor_id();
+                ts->task_type = task_type(current);
+                ft_buffer_finish_write(trace_ts_buf, ts);
+        }
+}
+
 feather_callback void save_timestamp(unsigned long event)
 {
         __save_timestamp(event, TSK_UNKNOWN);