mm: verify the page links and memory model
Print out information on how the page flags are being used if mminit_loglevel
is MMINIT_VERIFY or higher and unconditionally performs sanity checks on the
flags regardless of loglevel.
When the page flags are updated with section, node and zone information, a
check are made to ensure the values can be retrieved correctly. Finally we
confirm that pfn_to_page and page_to_pfn are the correct inverse functions.
[akpm@linux-foundation.org: fix printk warnings]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/mm_init.c b/mm/mm_init.c
index c01d8df..e16990d 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -7,9 +7,80 @@
*/
#include <linux/kernel.h>
#include <linux/init.h>
+#include "internal.h"
int __meminitdata mminit_loglevel;
+void __init mminit_verify_pageflags_layout(void)
+{
+ int shift, width;
+ unsigned long or_mask, add_mask;
+
+ shift = 8 * sizeof(unsigned long);
+ width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH;
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
+ "Section %d Node %d Zone %d Flags %d\n",
+ SECTIONS_WIDTH,
+ NODES_WIDTH,
+ ZONES_WIDTH,
+ NR_PAGEFLAGS);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
+ "Section %d Node %d Zone %d\n",
+#ifdef SECTIONS_SHIFT
+ SECTIONS_SHIFT,
+#else
+ 0,
+#endif
+ NODES_SHIFT,
+ ZONES_SHIFT);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_offsets",
+ "Section %lu Node %lu Zone %lu\n",
+ (unsigned long)SECTIONS_PGSHIFT,
+ (unsigned long)NODES_PGSHIFT,
+ (unsigned long)ZONES_PGSHIFT);
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_zoneid",
+ "Zone ID: %lu -> %lu\n",
+ (unsigned long)ZONEID_PGOFF,
+ (unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT));
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_usage",
+ "location: %d -> %d unused %d -> %d flags %d -> %d\n",
+ shift, width, width, NR_PAGEFLAGS, NR_PAGEFLAGS, 0);
+#ifdef NODE_NOT_IN_PAGE_FLAGS
+ mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodeflags",
+ "Node not in page flags");
+#endif
+
+ if (SECTIONS_WIDTH) {
+ shift -= SECTIONS_WIDTH;
+ BUG_ON(shift != SECTIONS_PGSHIFT);
+ }
+ if (NODES_WIDTH) {
+ shift -= NODES_WIDTH;
+ BUG_ON(shift != NODES_PGSHIFT);
+ }
+ if (ZONES_WIDTH) {
+ shift -= ZONES_WIDTH;
+ BUG_ON(shift != ZONES_PGSHIFT);
+ }
+
+ /* Check for bitmask overlaps */
+ or_mask = (ZONES_MASK << ZONES_PGSHIFT) |
+ (NODES_MASK << NODES_PGSHIFT) |
+ (SECTIONS_MASK << SECTIONS_PGSHIFT);
+ add_mask = (ZONES_MASK << ZONES_PGSHIFT) +
+ (NODES_MASK << NODES_PGSHIFT) +
+ (SECTIONS_MASK << SECTIONS_PGSHIFT);
+ BUG_ON(or_mask != add_mask);
+}
+
+void __meminit mminit_verify_page_links(struct page *page, enum zone_type zone,
+ unsigned long nid, unsigned long pfn)
+{
+ BUG_ON(page_to_nid(page) != nid);
+ BUG_ON(page_zonenum(page) != zone);
+ BUG_ON(page_to_pfn(page) != pfn);
+}
+
static __init int set_mminit_loglevel(char *str)
{
get_option(&str, &mminit_loglevel);