diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 34a5fece3121..720355cbdf45 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -57,6 +57,7 @@ Currently, these files are in /proc/sys/vm:
 - panic_on_oom
 - percpu_pagelist_fraction
 - stat_interval
+- stat_refresh
 - swappiness
 - user_reserve_kbytes
 - vfs_cache_pressure
@@ -755,6 +756,19 @@ is 1 second.
 
 ==============================================================
 
+stat_refresh
+
+Any read or write (by root only) flushes all the per-cpu vm statistics
+into their global totals, for more accurate reports when testing
+e.g. cat /proc/sys/vm/stat_refresh /proc/meminfo
+
+As a side-effect, it also checks for negative totals (elsewhere reported
+as 0) and "fails" with EINVAL if any are found, with a warning in dmesg.
+(At time of writing, a few stats are known sometimes to be found negative,
+with no ill effects: errors and warnings on these stats are suppressed.)
+
+==============================================================
+
 swappiness
 
 This control is used to define how aggressive the kernel will swap
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 73fae8c4a5fb..02fce415b3d9 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -193,6 +193,10 @@ void quiet_vmstat(void);
 void cpu_vm_stats_fold(int cpu);
 void refresh_zone_stat_thresholds(void);
 
+struct ctl_table;
+int vmstat_refresh(struct ctl_table *, int write,
+		   void __user *buffer, size_t *lenp, loff_t *ppos);
+
 void drain_zonestat(struct zone *zone, struct per_cpu_pageset *);
 
 int calculate_pressure_threshold(struct zone *zone);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c8b318663525..2effd84d83e3 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1521,6 +1521,13 @@ static struct ctl_table vm_table[] = {
 		.mode		= 0644,
 		.proc_handler	= proc_dointvec_jiffies,
 	},
+	{
+		.procname	= "stat_refresh",
+		.data		= NULL,
+		.maxlen		= 0,
+		.mode		= 0600,
+		.proc_handler	= vmstat_refresh,
+	},
 #endif
 #ifdef CONFIG_MMU
 	{
diff --git a/mm/vmstat.c b/mm/vmstat.c
index a7de9adacbd9..c831be32a1a3 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1379,6 +1379,66 @@ static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
 int sysctl_stat_interval __read_mostly = HZ;
 static cpumask_var_t cpu_stat_off;
 
+#ifdef CONFIG_PROC_FS
+static void refresh_vm_stats(struct work_struct *work)
+{
+	refresh_cpu_vm_stats(true);
+}
+
+int vmstat_refresh(struct ctl_table *table, int write,
+		   void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	long val;
+	int err;
+	int i;
+
+	/*
+	 * The regular update, every sysctl_stat_interval, may come later
+	 * than expected: leaving a significant amount in per_cpu buckets.
+	 * This is particularly misleading when checking a quantity of HUGE
+	 * pages, immediately after running a test.  /proc/sys/vm/stat_refresh,
+	 * which can equally be echo'ed to or cat'ted from (by root),
+	 * can be used to update the stats just before reading them.
+	 *
+	 * Oh, and since global_page_state() etc. are so careful to hide
+	 * transiently negative values, report an error here if any of
+	 * the stats is negative, so we know to go looking for imbalance.
+	 */
+	err = schedule_on_each_cpu(refresh_vm_stats);
+	if (err)
+		return err;
+	for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) {
+		val = atomic_long_read(&vm_stat[i]);
+		if (val < 0) {
+			switch (i) {
+			case NR_ALLOC_BATCH:
+			case NR_PAGES_SCANNED:
+				/*
+				 * These are often seen to go negative in
+				 * recent kernels, but not to go permanently
+				 * negative.  Whilst it would be nicer not to
+				 * have exceptions, rooting them out would be
+				 * another task, of rather low priority.
+				 */
+				break;
+			default:
+				pr_warn("%s: %s %ld\n",
+					__func__, vmstat_text[i], val);
+				err = -EINVAL;
+				break;
+			}
+		}
+	}
+	if (err)
+		return err;
+	if (write)
+		*ppos += *lenp;
+	else
+		*lenp = 0;
+	return 0;
+}
+#endif /* CONFIG_PROC_FS */
+
 static void vmstat_update(struct work_struct *w)
 {
 	if (refresh_cpu_vm_stats(true)) {