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authorMel Gorman <mel@csn.ul.ie>2008-07-23 21:26:51 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:13 -0700
commit708614e6180f398cd307ea0048d48ba6fa274610 (patch)
tree8fedf22cf9a2f404e2aef10c5b3858b99880c4c2 /mm/page_alloc.c
parent6b74ab97bc12ce74acec900f1d89a4aee2e4d70d (diff)
downloadop-kernel-dev-708614e6180f398cd307ea0048d48ba6fa274610.zip
op-kernel-dev-708614e6180f398cd307ea0048d48ba6fa274610.tar.gz
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>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0908352..acab6ad 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2534,6 +2534,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
}
page = pfn_to_page(pfn);
set_page_links(page, zone, nid, pfn);
+ mminit_verify_page_links(page, zone, nid, pfn);
init_page_count(page);
reset_page_mapcount(page);
SetPageReserved(page);
@@ -2836,6 +2837,12 @@ __meminit int init_currently_empty_zone(struct zone *zone,
zone->zone_start_pfn = zone_start_pfn;
+ mminit_dprintk(MMINIT_TRACE, "memmap_init",
+ "Initialising map node %d zone %lu pfns %lu -> %lu\n",
+ pgdat->node_id,
+ (unsigned long)zone_idx(zone),
+ zone_start_pfn, (zone_start_pfn + size));
+
zone_init_free_lists(zone);
return 0;
@@ -3961,6 +3968,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
early_node_map[i].end_pfn);
/* Initialise every node */
+ mminit_verify_pageflags_layout();
setup_nr_node_ids();
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
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