lib: generic show_mem()

[~andy/linux] / lib / show_mem.c

diff --git a/lib/show_mem.c b/lib/show_mem.c
new file mode 100644 (file)
index 0000000..238e72a
--- /dev/null
+++ b/lib/show_mem.c
@@ -0,0 +1,63 @@
+/*
+ * 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/nmi.h>
+#include <linux/quicklist.h>
+
+void show_mem(void)
+{
+       pg_data_t *pgdat;
+       unsigned long total = 0, reserved = 0, shared = 0,
+               nonshared = 0, highmem = 0;
+
+       printk(KERN_INFO "Mem-Info:\n");
+       show_free_areas();
+
+       for_each_online_pgdat(pgdat) {
+               unsigned long i, flags;
+
+               pgdat_resize_lock(pgdat, &flags);
+               for (i = 0; i < pgdat->node_spanned_pages; i++) {
+                       struct page *page;
+                       unsigned long pfn = pgdat->node_start_pfn + i;
+
+                       if (unlikely(!(i % MAX_ORDER_NR_PAGES)))
+                               touch_nmi_watchdog();
+
+                       if (!pfn_valid(pfn))
+                               continue;
+
+                       page = pfn_to_page(pfn);
+
+                       if (PageHighMem(page))
+                               highmem++;
+
+                       if (PageReserved(page))
+                               reserved++;
+                       else if (page_count(page) == 1)
+                               nonshared++;
+                       else if (page_count(page) > 1)
+                               shared += page_count(page) - 1;
+
+                       total++;
+               }
+               pgdat_resize_unlock(pgdat, &flags);
+       }
+
+       printk(KERN_INFO "%lu pages RAM\n", total);
+#ifdef CONFIG_HIGHMEM
+       printk(KERN_INFO "%lu pages HighMem\n", highmem);
+#endif
+       printk(KERN_INFO "%lu pages reserved\n", reserved);
+       printk(KERN_INFO "%lu pages shared\n", shared);
+       printk(KERN_INFO "%lu pages non-shared\n", nonshared);
+#ifdef CONFIG_QUICKLIST
+       printk(KERN_INFO "%lu pages in pagetable cache\n",
+               quicklist_total_size());
+#endif
+}