diff --git a/arch/s390/appldata/appldata_base.c b/arch/s390/appldata/appldata_base.c
index c2978cb..6844b52 100644
--- a/arch/s390/appldata/appldata_base.c
+++ b/arch/s390/appldata/appldata_base.c
@@ -423,4 +423,4 @@ EXPORT_SYMBOL_GPL(si_swapinfo);
 #endif
 EXPORT_SYMBOL_GPL(nr_threads);
 EXPORT_SYMBOL_GPL(nr_running);
-EXPORT_SYMBOL_GPL(nr_iowait);
+EXPORT_SYMBOL_GPL(nr_iowait_acct);
diff --git a/arch/s390/appldata/appldata_os.c b/arch/s390/appldata/appldata_os.c
index a363d30..fa4b278 100644
--- a/arch/s390/appldata/appldata_os.c
+++ b/arch/s390/appldata/appldata_os.c
@@ -100,7 +100,7 @@ static void appldata_get_os_data(void *data)
 
 	os_data->nr_threads = nr_threads;
 	os_data->nr_running = nr_running();
-	os_data->nr_iowait  = nr_iowait();
+	os_data->nr_iowait  = nr_iowait_acct();
 	os_data->avenrun[0] = avenrun[0] + (FIXED_1/200);
 	os_data->avenrun[1] = avenrun[1] + (FIXED_1/200);
 	os_data->avenrun[2] = avenrun[2] + (FIXED_1/200);
diff --git a/fs/proc/stat.c b/fs/proc/stat.c
index da60956..149be7a 100644
--- a/fs/proc/stat.c
+++ b/fs/proc/stat.c
@@ -180,7 +180,7 @@ static int show_stat(struct seq_file *p, void *v)
 		(unsigned long long)boottime.tv_sec,
 		total_forks,
 		nr_running(),
-		nr_iowait());
+		nr_iowait_acct());
 
 	seq_put_decimal_ull(p, "softirq ", (unsigned long long)sum_softirq);
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index ffe8f61..1e198e2 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -922,7 +922,13 @@ struct task_struct {
 
 	/* Bit to tell TOMOYO we're in execve(): */
 	unsigned			in_execve:1;
+	/* task is in iowait */
 	unsigned			in_iowait:1;
+	/*
+	 * task is in iowait and should be accounted as such. can only be set
+	 * if ->in_iowait is also set.
+	 */
+	unsigned			in_iowait_acct:1;
 #ifndef TIF_RESTORE_SIGMASK
 	unsigned			restore_sigmask:1;
 #endif
diff --git a/include/linux/sched/stat.h b/include/linux/sched/stat.h
index 0108a38..7c48a35 100644
--- a/include/linux/sched/stat.h
+++ b/include/linux/sched/stat.h
@@ -19,8 +19,14 @@ DECLARE_PER_CPU(unsigned long, process_counts);
 extern int nr_processes(void);
 extern unsigned int nr_running(void);
 extern bool single_task_running(void);
-extern unsigned int nr_iowait(void);
-extern unsigned int nr_iowait_cpu(int cpu);
+extern unsigned int nr_iowait_acct(void);
+extern unsigned int nr_iowait_acct_cpu(int cpu);
+unsigned int nr_iowait_cpu(int cpu);
+
+enum {
+	TASK_IOWAIT		= 1,
+	TASK_IOWAIT_ACCT	= 2,
+};
 
 static inline int sched_info_on(void)
 {
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 48d1552..66a3654 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3790,6 +3790,8 @@ ttwu_do_activate(struct rq *rq, struct task_struct *p, int wake_flags,
 	if (p->in_iowait) {
 		delayacct_blkio_end(p);
 		task_rq(p)->nr_iowait--;
+		if (p->in_iowait_acct)
+			task_rq(p)->nr_iowait_acct--;
 	}
 
 	activate_task(rq, p, en_flags);
@@ -4358,6 +4360,8 @@ int try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
 
 				delayacct_blkio_end(p);
 				atomic_inc(&__rq->nr_iowait_remote);
+				if (p->in_iowait_acct)
+					atomic_inc(&__rq->nr_iowait_acct_remote);
 			}
 
 			wake_flags |= WF_MIGRATED;
@@ -5463,11 +5467,11 @@ unsigned long long nr_context_switches(void)
  * it does become runnable.
  */
 
-unsigned int nr_iowait_cpu(int cpu)
+unsigned int nr_iowait_acct_cpu(int cpu)
 {
 	struct rq *rq = cpu_rq(cpu);
 
-	return rq->nr_iowait - atomic_read(&rq->nr_iowait_remote);
+	return rq->nr_iowait_acct - atomic_read(&rq->nr_iowait_acct_remote);
 }
 
 /*
@@ -5500,16 +5504,23 @@ unsigned int nr_iowait_cpu(int cpu)
  * Task CPU affinities can make all that even more 'interesting'.
  */
 
-unsigned int nr_iowait(void)
+unsigned int nr_iowait_acct(void)
 {
 	unsigned int i, sum = 0;
 
 	for_each_possible_cpu(i)
-		sum += nr_iowait_cpu(i);
+		sum += nr_iowait_acct_cpu(i);
 
 	return sum;
 }
 
+unsigned int nr_iowait_cpu(int cpu)
+{
+	struct rq *rq = cpu_rq(cpu);
+
+	return rq->nr_iowait - atomic_read(&rq->nr_iowait_remote);
+}
+
 #ifdef CONFIG_SMP
 
 /*
@@ -6686,6 +6697,8 @@ static void __sched notrace __schedule(unsigned int sched_mode)
 
 			if (prev->in_iowait) {
 				rq->nr_iowait++;
+				if (prev->in_iowait_acct)
+					rq->nr_iowait_acct++;
 				delayacct_blkio_start();
 			}
 		}
@@ -8988,18 +9001,32 @@ int __sched yield_to(struct task_struct *p, bool preempt)
 }
 EXPORT_SYMBOL_GPL(yield_to);
 
+/*
+ * Returns a token which is comprised of the two bits of iowait wait state -
+ * one is whether we're making ourselves as in iowait for cpufreq reasons,
+ * and the other is if the task should be accounted as such.
+ */
 int io_schedule_prepare(void)
 {
-	int old_iowait = current->in_iowait;
+	int old_wait_flags = 0;
+
+	if (current->in_iowait)
+		old_wait_flags |= TASK_IOWAIT;
+	if (current->in_iowait_acct)
+		old_wait_flags |= TASK_IOWAIT_ACCT;
 
 	current->in_iowait = 1;
+	current->in_iowait_acct = 1;
 	blk_flush_plug(current->plug, true);
-	return old_iowait;
+	return old_wait_flags;
 }
 
-void io_schedule_finish(int token)
+void io_schedule_finish(int old_wait_flags)
 {
-	current->in_iowait = token;
+	if (!(old_wait_flags & TASK_IOWAIT))
+		current->in_iowait = 0;
+	if (!(old_wait_flags & TASK_IOWAIT_ACCT))
+		current->in_iowait_acct = 0;
 }
 
 /*
@@ -10033,6 +10060,8 @@ void __init sched_init(void)
 #endif
 #endif /* CONFIG_SMP */
 		hrtick_rq_init(rq);
+		rq->nr_iowait_acct = 0;
+		atomic_set(&rq->nr_iowait_acct_remote, 0);
 		rq->nr_iowait = 0;
 		atomic_set(&rq->nr_iowait_remote, 0);
 
diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index 91fa5b4..abd7a93 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -1054,6 +1054,8 @@ struct rq {
 	 * modified under the rq lock (nr_iowait), and if we don't have the rq
 	 * lock, then nr_iowait_remote is used.
 	 */
+	unsigned int		nr_iowait_acct;
+	atomic_t		nr_iowait_acct_remote;
 	unsigned int		nr_iowait;
 	atomic_t		nr_iowait_remote;
 
diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 01fb50c..f6709d5 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -669,7 +669,7 @@ static void tick_nohz_stop_idle(struct tick_sched *ts, ktime_t now)
 	delta = ktime_sub(now, ts->idle_entrytime);
 
 	write_seqcount_begin(&ts->idle_sleeptime_seq);
-	if (nr_iowait_cpu(smp_processor_id()) > 0)
+	if (nr_iowait_acct_cpu(smp_processor_id()) > 0)
 		ts->iowait_sleeptime = ktime_add(ts->iowait_sleeptime, delta);
 	else
 		ts->idle_sleeptime = ktime_add(ts->idle_sleeptime, delta);
@@ -742,7 +742,7 @@ u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time)
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
 	return get_cpu_sleep_time_us(ts, &ts->idle_sleeptime,
-				     !nr_iowait_cpu(cpu), last_update_time);
+				     !nr_iowait_acct_cpu(cpu), last_update_time);
 }
 EXPORT_SYMBOL_GPL(get_cpu_idle_time_us);
 
@@ -768,7 +768,7 @@ u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time)
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
 
 	return get_cpu_sleep_time_us(ts, &ts->iowait_sleeptime,
-				     nr_iowait_cpu(cpu), last_update_time);
+				     nr_iowait_acct_cpu(cpu), last_update_time);
 }
 EXPORT_SYMBOL_GPL(get_cpu_iowait_time_us);