diff --git a/fs/procfs/fs_procfsproc.c b/fs/procfs/fs_procfsproc.c
index 39d3f76702..10056341d9 100644
--- a/fs/procfs/fs_procfsproc.c
+++ b/fs/procfs/fs_procfsproc.c
@@ -762,6 +762,7 @@ static ssize_t proc_critmon(FAR struct proc_file_s *procfile,
                             size_t buflen, off_t offset)
 {
   struct timespec maxtime;
+  struct timespec runtime;
   size_t remaining;
   size_t linesize;
   size_t copysize;
@@ -851,12 +852,18 @@ static ssize_t proc_critmon(FAR struct proc_file_s *procfile,
   /* Reset the maximum */
 
   tcb->run_max = 0;
+  up_perf_convert(tcb->run_time, &runtime);
 
-  /* Generate output for maximum time thread running */
+  /* Output the maximum time the thread has run and
+   * the total time the thread has run
+   */
 
-  linesize = procfs_snprintf(procfile->line, STATUS_LINELEN, "%lu.%09lu\n",
+  linesize = procfs_snprintf(procfile->line, STATUS_LINELEN,
+                             "%lu.%09lu,%lu.%09lu\n",
                              (unsigned long)maxtime.tv_sec,
-                             (unsigned long)maxtime.tv_nsec);
+                             (unsigned long)maxtime.tv_nsec,
+                             (unsigned long)runtime.tv_sec,
+                             (unsigned long)(runtime.tv_nsec));
   copysize = procfs_memcpy(procfile->line, linesize, buffer, remaining,
                            &offset);
 
diff --git a/include/nuttx/sched.h b/include/nuttx/sched.h
index 8cd49978da..1a163f6ac5 100644
--- a/include/nuttx/sched.h
+++ b/include/nuttx/sched.h
@@ -639,6 +639,7 @@ struct tcb_s
   unsigned long crit_max;                /* Max time in critical section    */
   unsigned long run_start;               /* Time when thread begin run      */
   unsigned long run_max;                 /* Max time thread run             */
+  unsigned long run_time;                /* Total time thread run           */
 #endif
 
   /* State save areas *******************************************************/
diff --git a/sched/sched/sched_critmonitor.c b/sched/sched/sched_critmonitor.c
index 6425dfbb80..293e0a4b3e 100644
--- a/sched/sched/sched_critmonitor.c
+++ b/sched/sched/sched_critmonitor.c
@@ -297,6 +297,7 @@ void nxsched_suspend_critmon(FAR struct tcb_s *tcb)
   unsigned long current = up_perf_gettime();
   unsigned long elapsed = current - tcb->run_start;
 
+  tcb->run_time += elapsed;
   if (elapsed > tcb->run_max)
     {
       tcb->run_max = elapsed;