lib: generic show_mem()

This implements a platform-independent version of show_mem().

Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Bryan Wu <cooloney@kernel.org>
Cc: Chris Zankel <chris@zankel.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Greg Ungerer <gerg@uclinux.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: Hirokazu Takata <takata@linux-m32r.org>
Cc: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 64 insertions, 1 deletions

diff --git a/lib/Makefile b/lib/Makefile
index 942c7250f603..3b1f94bbe9de 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -11,7 +11,7 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
          rbtree.o radix-tree.o dump_stack.o \
          idr.o int_sqrt.o extable.o prio_tree.o \
          sha1.o irq_regs.o reciprocal_div.o argv_split.o \
-         proportions.o prio_heap.o ratelimit.o
+         proportions.o prio_heap.o ratelimit.o show_mem.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
diff --git a/lib/show_mem.c b/lib/show_mem.c
new file mode 100644
index 000000000000..238e72a18ce1
--- /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
+}