diff --git a/kernel/futex.c b/kernel/futex.c
index b9999093..373e59b3 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -788,6 +788,15 @@ static int futex_wait(uint32_t __user *uaddr, int fshared,
 	if (!bitset)
 		return -EINVAL;
 
+#ifdef PROFILE_ENABLE
+	if (cpu_local_var(current)->profile &&
+			cpu_local_var(current)->profile_start_ts) {
+		cpu_local_var(current)->profile_elapsed_ts +=
+			(rdtsc() - cpu_local_var(current)->profile_start_ts);
+		cpu_local_var(current)->profile_start_ts = 0;
+	}
+#endif
+
 	q.bitset = bitset;
 	q.requeue_pi_key = NULL;
 
@@ -822,6 +831,11 @@ retry:
 out_put_key:
 	put_futex_key(fshared, &q.key);
 out:
+#ifdef PROFILE_ENABLE
+	if (cpu_local_var(current)->profile) {
+		cpu_local_var(current)->profile_start_ts = rdtsc();
+	}
+#endif
 	return ret;
 }
 
diff --git a/kernel/include/process.h b/kernel/include/process.h
index 67773fc4..79efc9b7 100644
--- a/kernel/include/process.h
+++ b/kernel/include/process.h
@@ -554,6 +554,7 @@ struct process {
 	int profile;
 	mcs_lock_node_t profile_lock;
 	struct profile_event *profile_events;
+	unsigned long profile_elapsed_ts;
 #endif // PROFILE_ENABLE
 	int nr_processes; /* For partitioned execution */
 };
@@ -631,6 +632,8 @@ struct thread {
 #ifdef PROFILE_ENABLE
 	int profile;
 	struct profile_event *profile_events;
+	unsigned long profile_start_ts;
+	unsigned long profile_elapsed_ts;
 #endif // PROFILE_ENABLE
 
 	// signal
diff --git a/kernel/process.c b/kernel/process.c
index 11cfbb14..537f7787 100644
--- a/kernel/process.c
+++ b/kernel/process.c
@@ -2966,6 +2966,19 @@ redo:
 				perf_start(next->proc->monitoring_event);
 			}
 		}
+
+#ifdef PROFILE_ENABLE
+		if (prev->profile && prev->profile_start_ts != 0) {
+			prev->profile_elapsed_ts +=
+				(rdtsc() - prev->profile_start_ts);
+			prev->profile_start_ts = 0;
+		}
+
+		if (next->profile && next->profile_start_ts == 0) {
+			next->profile_start_ts = rdtsc();
+		}
+#endif
+
 		if (prev) {
 			last = ihk_mc_switch_context(&prev->ctx, &next->ctx, prev);
 		}
diff --git a/kernel/profile.c b/kernel/profile.c
index aba2f985..14cb9f01 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -74,6 +74,7 @@ mcs_lock_node_t job_profile_lock = {0, NULL};
 struct profile_event *job_profile_events = NULL;
 int job_nr_processes = -1;
 int job_nr_processes_left = -1;
+unsigned long job_elapsed_ts;
 
 
 
@@ -111,16 +112,26 @@ void profile_print_thread_stats(struct thread *thread)
 	int i;
 	unsigned long flags;
 
-	if (!thread->profile_events) return;
+	if (!thread->profile_events)
+		return;
+
+	/* Not yet accumulated period? */
+	if (thread->profile_start_ts) {
+		thread->profile_elapsed_ts += (rdtsc() - thread->profile_start_ts);
+	}
 
 	flags = kprintf_lock();
 
+	__kprintf("TID: %4d elapsed cycles (excluding idle): %luk\n",
+			thread->tid,
+			thread->profile_elapsed_ts / 1000);
+
 	for (i = 0; i < PROFILE_SYSCALL_MAX; ++i) {
 		if (!thread->profile_events[i].cnt &&
-				!thread->profile_events[i + PROFILE_SYSCALL_MAX].cnt) 
+				!thread->profile_events[i + PROFILE_SYSCALL_MAX].cnt)
 			continue;
 
-		__kprintf("TID: %4d (%3d,%20s): %6u %6luk offl: %6u %6luk\n",
+		__kprintf("TID: %4d (%3d,%20s): %6u %6luk offl: %6u %6luk (%2d.%2d%%)\n",
 				thread->tid,
 				i,
 				syscall_name[i],
@@ -133,7 +144,13 @@ void profile_print_thread_stats(struct thread *thread)
 				(thread->profile_events[i + PROFILE_SYSCALL_MAX].tsc /
 				 (thread->profile_events[i + PROFILE_SYSCALL_MAX].cnt ?
 				  thread->profile_events[i + PROFILE_SYSCALL_MAX].cnt : 1))
-				/ 1000
+				/ 1000,
+				 (thread->profile_events[i].tsc ?
+				  thread->profile_events[i].tsc * 100
+				  / thread->profile_elapsed_ts : 0),
+				 (thread->profile_events[i].tsc ?
+				  (thread->profile_events[i].tsc * 10000
+				  / thread->profile_elapsed_ts) % 100 : 0)
 				);
 	}
 
@@ -149,7 +166,14 @@ void profile_print_thread_stats(struct thread *thread)
 				(thread->profile_events[i].tsc /
 				 (thread->profile_events[i].cnt ?
 				  thread->profile_events[i].cnt : 1))
-				/ 1000);
+				/ 1000,
+				(thread->profile_events[i].tsc ?
+				 thread->profile_events[i].tsc * 100
+				 / thread->profile_elapsed_ts : 0),
+				(thread->profile_events[i].tsc ?
+				 (thread->profile_events[i].tsc * 10000
+				  / thread->profile_elapsed_ts) % 100 : 0)
+				);
 	}
 
 
@@ -161,16 +185,20 @@ void profile_print_proc_stats(struct process *proc)
 	int i;
 	unsigned long flags;
 
-	if (!proc->profile_events) return;
+	if (!proc->profile_events || !proc->profile_elapsed_ts)
+		return;
 
 	flags = kprintf_lock();
+	__kprintf("PID: %4d elapsed cycles for all threads (excluding idle): %luk\n",
+			proc->pid,
+			proc->profile_elapsed_ts / 1000);
 
 	for (i = 0; i < PROFILE_SYSCALL_MAX; ++i) {
 		if (!proc->profile_events[i].cnt &&
-				!proc->profile_events[i + PROFILE_SYSCALL_MAX].cnt) 
+				!proc->profile_events[i + PROFILE_SYSCALL_MAX].cnt)
 			continue;
 
-		__kprintf("PID: %4d (%3d,%20s): %6u %6luk offl: %6u %6luk\n",
+		__kprintf("PID: %4d (%3d,%20s): %6u %6luk offl: %6u %6luk (%2d.%2d%%)\n",
 				proc->pid,
 				i,
 				syscall_name[i],
@@ -183,7 +211,13 @@ void profile_print_proc_stats(struct process *proc)
 				(proc->profile_events[i + PROFILE_SYSCALL_MAX].tsc /
 				 (proc->profile_events[i + PROFILE_SYSCALL_MAX].cnt ?
 				  proc->profile_events[i + PROFILE_SYSCALL_MAX].cnt : 1))
-				/ 1000
+				/ 1000,
+				(proc->profile_events[i].tsc ?
+				 proc->profile_events[i].tsc * 100
+				 / proc->profile_elapsed_ts : 0),
+				(proc->profile_events[i].tsc ?
+				 (proc->profile_events[i].tsc * 10000
+				  / proc->profile_elapsed_ts) % 100 : 0)
 				);
 	}
 
@@ -199,7 +233,16 @@ void profile_print_proc_stats(struct process *proc)
 				(proc->profile_events[i].tsc /
 				 (proc->profile_events[i].cnt ?
 				  proc->profile_events[i].cnt : 1))
-				/ 1000);
+				/ 1000,
+				(proc->profile_events[i].tsc &&
+				 proc->profile_elapsed_ts ?
+				 proc->profile_events[i].tsc * 100
+				 / proc->profile_elapsed_ts : 0),
+				(proc->profile_events[i].tsc &&
+				 proc->profile_elapsed_ts ?
+				 (proc->profile_events[i].tsc * 10000
+				  / proc->profile_elapsed_ts) % 100 : 0)
+				);
 	}
 
 	kprintf_unlock(flags);
@@ -217,6 +260,7 @@ int profile_accumulate_and_print_job_events(struct process *proc)
 	if (job_nr_processes == -1) {
 		job_nr_processes = proc->nr_processes;
 		job_nr_processes_left = proc->nr_processes;
+		job_elapsed_ts = 0;
 	}
 
 	--job_nr_processes_left;
@@ -248,16 +292,21 @@ int profile_accumulate_and_print_job_events(struct process *proc)
 		proc->profile_events[i].cnt = 0;
 	}
 
+	job_elapsed_ts += proc->profile_elapsed_ts;
+
 	/* Last process? */
 	if (job_nr_processes_left == 0) {
 		flags = kprintf_lock();
+		__kprintf("JOB: (%2d) elapsed cycles for all threads (excluding idle): %luk\n",
+				job_nr_processes,
+				job_elapsed_ts / 1000);
 
 		for (i = 0; i < PROFILE_SYSCALL_MAX; ++i) {
 			if (!job_profile_events[i].cnt &&
 					!job_profile_events[i + PROFILE_SYSCALL_MAX].cnt)
 				continue;
 
-			__kprintf("JOB: (%2d) (%3d,%20s): %6u %6luk offl: %6u %6luk\n",
+			__kprintf("JOB: (%2d) (%3d,%20s): %6u %6luk offl: %6u %6luk (%2d.%2d%%)\n",
 					job_nr_processes,
 					i,
 					syscall_name[i],
@@ -270,7 +319,13 @@ int profile_accumulate_and_print_job_events(struct process *proc)
 					(job_profile_events[i + PROFILE_SYSCALL_MAX].tsc /
 					 (job_profile_events[i + PROFILE_SYSCALL_MAX].cnt ?
 					  job_profile_events[i + PROFILE_SYSCALL_MAX].cnt : 1))
-					/ 1000
+					/ 1000,
+					(job_profile_events[i].tsc ?
+					 job_profile_events[i].tsc * 100
+					 / job_elapsed_ts : 0),
+					(job_profile_events[i].tsc ?
+					 (job_profile_events[i].tsc * 10000
+					  / job_elapsed_ts) % 100 : 0)
 					);
 
 			job_profile_events[i].tsc = 0;
@@ -302,6 +357,7 @@ int profile_accumulate_and_print_job_events(struct process *proc)
 		/* Reset job process indicators */
 		job_nr_processes = -1;
 		job_nr_processes_left = -1;
+		job_elapsed_ts = 0;
 	}
 
 	mcs_lock_unlock(&job_profile_lock, &mcs_node);
@@ -326,6 +382,12 @@ void profile_accumulate_events(struct thread *thread,
 		thread->profile_events[i].cnt = 0;
 	}
 
+	proc->profile_elapsed_ts += thread->profile_elapsed_ts;
+	if (thread->profile_start_ts) {
+		proc->profile_elapsed_ts +=
+			(rdtsc() - thread->profile_start_ts);
+	}
+
 	mcs_lock_unlock(&proc->profile_lock, &mcs_node);
 }
 
@@ -381,6 +443,7 @@ void profile_dealloc_proc_events(struct process *proc)
 
 void static profile_clear_process(struct process *proc)
 {
+	proc->profile_elapsed_ts = 0;
 	if (!proc->profile_events) return;
 
 	memset(proc->profile_events, 0,
@@ -389,6 +452,8 @@ void static profile_clear_process(struct process *proc)
 
 void static profile_clear_thread(struct thread *thread)
 {
+	thread->profile_start_ts = 0;
+	thread->profile_elapsed_ts = 0;
 	if (!thread->profile_events) return;
 
 	memset(thread->profile_events, 0,
@@ -399,6 +464,7 @@ int do_profile(int flag)
 {
 	struct thread *thread = cpu_local_var(current);
 	struct process *proc = thread->proc;
+	unsigned long now_ts = rdtsc();
 
 	/* Job level? */
 	if (flag & PROF_JOB) {
@@ -444,7 +510,14 @@ int do_profile(int flag)
 				_thread->profile = 1;
 			}
 			else if (flag & PROF_OFF) {
-				_thread->profile = 0;
+				if (_thread->profile) {
+					_thread->profile = 0;
+					if (_thread->profile_start_ts) {
+						_thread->profile_elapsed_ts +=
+							(now_ts - _thread->profile_start_ts);
+					}
+					_thread->profile_start_ts = 0;
+				}
 			}
 		}
 
@@ -460,7 +533,9 @@ int do_profile(int flag)
 
 		/* Make sure future threads profile as well */
 		if (flag & PROF_ON) {
-			proc->profile = 1;
+			if (!proc->profile) {
+				proc->profile = 1;
+			}
 		}
 		else if (flag & PROF_OFF) {
 			proc->profile = 0;
@@ -476,13 +551,28 @@ int do_profile(int flag)
 
 		if (flag & PROF_CLEAR) {
 			profile_clear_thread(thread);
+			/* If profiling, reset start and elapsed */
+			if (thread->profile) {
+				thread->profile_start_ts = 0;
+				thread->profile_elapsed_ts = 0;
+			}
 		}
 
 		if (flag & PROF_ON) {
-			thread->profile = 1;
+			if (!thread->profile) {
+				thread->profile = 1;
+				thread->profile_start_ts = 0;
+			}
 		}
 		else if (flag & PROF_OFF) {
-			thread->profile = 0;
+			if (thread->profile) {
+				thread->profile = 0;
+				if (thread->profile_start_ts) {
+					thread->profile_elapsed_ts +=
+						(now_ts - thread->profile_start_ts);
+				}
+				thread->profile_start_ts = 0;
+			}
 		}
 	}
 
diff --git a/kernel/syscall.c b/kernel/syscall.c
index c6cb8359..0bc6f224 100644
--- a/kernel/syscall.c
+++ b/kernel/syscall.c
@@ -9307,9 +9307,6 @@ set_cputime(int mode)
 long syscall(int num, ihk_mc_user_context_t *ctx)
 {
 	long l;
-#ifdef PROFILE_ENABLE
-	uint64_t t_s;
-#endif // PROFILE_ENABLE
 	struct thread *thread = cpu_local_var(current);
 
 #ifdef DISABLE_SCHED_YIELD
@@ -9317,6 +9314,14 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
 #endif // DISABLE_SCHED_YIELD
 		set_cputime(1);
 
+#ifdef PROFILE_ENABLE
+	if (thread->profile && thread->profile_start_ts) {
+		unsigned long ts = rdtsc();
+		thread->profile_elapsed_ts += (ts - thread->profile_start_ts);
+		thread->profile_start_ts = ts;
+	}
+#endif // PROFILE_ENABLE
+
 	if(cpu_local_var(current)->proc->status == PS_EXITED &&
 	   (num != __NR_exit && num != __NR_exit_group)){
 		check_signal(-EINVAL, NULL, 0);
@@ -9356,10 +9361,6 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
 #endif
     dkprintf("\n");
 
-#ifdef PROFILE_ENABLE
-	t_s = rdtsc();
-#endif // PROFILE_ENABLE
-
 	if ((0 <= num) && (num < (sizeof(syscall_table) / sizeof(syscall_table[0])))
 			&& (syscall_table[num] != NULL)) {
 		l = syscall_table[num](num, ctx);
@@ -9381,13 +9382,22 @@ long syscall(int num, ihk_mc_user_context_t *ctx)
 	}
 
 #ifdef PROFILE_ENABLE
-	if (num < PROFILE_SYSCALL_MAX) {
-		profile_event_add(num, (rdtsc() - t_s));
-	}
-	else {
-		if (num != __NR_profile) {
-			dkprintf("%s: syscall > %d ?? : %d\n",
-					__FUNCTION__, PROFILE_SYSCALL_MAX, num);
+	if (thread->profile) {
+		unsigned long ts = rdtsc();
+
+		/*
+		 * futex_wait() and schedule() will internally reset
+		 * thread->profile_start_ts so that actual wait time
+		 * is not accounted for.
+		 */
+		if (num < PROFILE_SYSCALL_MAX) {
+			profile_event_add(num, (ts - thread->profile_start_ts));
+		}
+		else {
+			if (num != __NR_profile) {
+				dkprintf("%s: syscall > %d ?? : %d\n",
+						__FUNCTION__, PROFILE_SYSCALL_MAX, num);
+			}
 		}
 	}
 #endif // PROFILE_ENABLE