v4.19.13 snapshot.
diff --git a/lib/show_mem.c b/lib/show_mem.c
new file mode 100644
index 0000000..0beaa1d
--- /dev/null
+++ b/lib/show_mem.c
@@ -0,0 +1,52 @@
+/*
+ * Generic show_mem() implementation
+ *
+ * Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
+ * All code subject to the GPL version 2.
+ */
+
+#include <linux/mm.h>
+#include <linux/quicklist.h>
+#include <linux/cma.h>
+
+void show_mem(unsigned int filter, nodemask_t *nodemask)
+{
+ pg_data_t *pgdat;
+ unsigned long total = 0, reserved = 0, highmem = 0;
+
+ printk("Mem-Info:\n");
+ show_free_areas(filter, nodemask);
+
+ for_each_online_pgdat(pgdat) {
+ unsigned long flags;
+ int zoneid;
+
+ pgdat_resize_lock(pgdat, &flags);
+ for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) {
+ struct zone *zone = &pgdat->node_zones[zoneid];
+ if (!populated_zone(zone))
+ continue;
+
+ total += zone->present_pages;
+ reserved += zone->present_pages - zone->managed_pages;
+
+ if (is_highmem_idx(zoneid))
+ highmem += zone->present_pages;
+ }
+ pgdat_resize_unlock(pgdat, &flags);
+ }
+
+ printk("%lu pages RAM\n", total);
+ printk("%lu pages HighMem/MovableOnly\n", highmem);
+ printk("%lu pages reserved\n", reserved);
+#ifdef CONFIG_CMA
+ printk("%lu pages cma reserved\n", totalcma_pages);
+#endif
+#ifdef CONFIG_QUICKLIST
+ printk("%lu pages in pagetable cache\n",
+ quicklist_total_size());
+#endif
+#ifdef CONFIG_MEMORY_FAILURE
+ printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
+#endif
+}