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Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c135
1 files changed, 68 insertions, 67 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d8ac0147456..7bf22e04531 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -69,7 +69,7 @@ EXPORT_SYMBOL(node_states);
unsigned long totalram_pages __read_mostly;
unsigned long totalreserve_pages __read_mostly;
-long nr_swap_pages;
+unsigned long highest_memmap_pfn __read_mostly;
int percpu_pagelist_fraction;
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
@@ -223,19 +223,41 @@ static inline int bad_range(struct zone *zone, struct page *page)
static void bad_page(struct page *page)
{
- printk(KERN_EMERG "Bad page state in process '%s'\n" KERN_EMERG
- "page:%p flags:0x%0*lx mapping:%p mapcount:%d count:%d\n",
- current->comm, page, (int)(2*sizeof(unsigned long)),
- (unsigned long)page->flags, page->mapping,
- page_mapcount(page), page_count(page));
+ static unsigned long resume;
+ static unsigned long nr_shown;
+ static unsigned long nr_unshown;
+
+ /*
+ * Allow a burst of 60 reports, then keep quiet for that minute;
+ * or allow a steady drip of one report per second.
+ */
+ if (nr_shown == 60) {
+ if (time_before(jiffies, resume)) {
+ nr_unshown++;
+ goto out;
+ }
+ if (nr_unshown) {
+ printk(KERN_ALERT
+ "BUG: Bad page state: %lu messages suppressed\n",
+ nr_unshown);
+ nr_unshown = 0;
+ }
+ nr_shown = 0;
+ }
+ if (nr_shown++ == 0)
+ resume = jiffies + 60 * HZ;
+
+ printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n",
+ current->comm, page_to_pfn(page));
+ printk(KERN_ALERT
+ "page:%p flags:%p count:%d mapcount:%d mapping:%p index:%lx\n",
+ page, (void *)page->flags, page_count(page),
+ page_mapcount(page), page->mapping, page->index);
- printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n"
- KERN_EMERG "Backtrace:\n");
dump_stack();
- page->flags &= ~PAGE_FLAGS_CLEAR_WHEN_BAD;
- set_page_count(page, 0);
- reset_page_mapcount(page);
- page->mapping = NULL;
+out:
+ /* Leave bad fields for debug, except PageBuddy could make trouble */
+ __ClearPageBuddy(page);
add_taint(TAINT_BAD_PAGE);
}
@@ -292,25 +314,31 @@ void prep_compound_gigantic_page(struct page *page, unsigned long order)
}
#endif
-static void destroy_compound_page(struct page *page, unsigned long order)
+static int destroy_compound_page(struct page *page, unsigned long order)
{
int i;
int nr_pages = 1 << order;
+ int bad = 0;
- if (unlikely(compound_order(page) != order))
+ if (unlikely(compound_order(page) != order) ||
+ unlikely(!PageHead(page))) {
bad_page(page);
+ bad++;
+ }
- if (unlikely(!PageHead(page)))
- bad_page(page);
__ClearPageHead(page);
+
for (i = 1; i < nr_pages; i++) {
struct page *p = page + i;
- if (unlikely(!PageTail(p) |
- (p->first_page != page)))
+ if (unlikely(!PageTail(p) | (p->first_page != page))) {
bad_page(page);
+ bad++;
+ }
__ClearPageTail(p);
}
+
+ return bad;
}
static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
@@ -430,7 +458,8 @@ static inline void __free_one_page(struct page *page,
int migratetype = get_pageblock_migratetype(page);
if (unlikely(PageCompound(page)))
- destroy_compound_page(page, order);
+ if (unlikely(destroy_compound_page(page, order)))
+ return;
page_idx = page_to_pfn(page) & ((1 << MAX_ORDER) - 1);
@@ -467,18 +496,13 @@ static inline int free_pages_check(struct page *page)
if (unlikely(page_mapcount(page) |
(page->mapping != NULL) |
(page_count(page) != 0) |
- (page->flags & PAGE_FLAGS_CHECK_AT_FREE)))
+ (page->flags & PAGE_FLAGS_CHECK_AT_FREE))) {
bad_page(page);
- if (PageDirty(page))
- __ClearPageDirty(page);
- if (PageSwapBacked(page))
- __ClearPageSwapBacked(page);
- /*
- * For now, we report if PG_reserved was found set, but do not
- * clear it, and do not free the page. But we shall soon need
- * to do more, for when the ZERO_PAGE count wraps negative.
- */
- return PageReserved(page);
+ return 1;
+ }
+ if (page->flags & PAGE_FLAGS_CHECK_AT_PREP)
+ page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
+ return 0;
}
/*
@@ -523,11 +547,11 @@ static void __free_pages_ok(struct page *page, unsigned int order)
{
unsigned long flags;
int i;
- int reserved = 0;
+ int bad = 0;
for (i = 0 ; i < (1 << order) ; ++i)
- reserved += free_pages_check(page + i);
- if (reserved)
+ bad += free_pages_check(page + i);
+ if (bad)
return;
if (!PageHighMem(page)) {
@@ -612,23 +636,11 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
if (unlikely(page_mapcount(page) |
(page->mapping != NULL) |
(page_count(page) != 0) |
- (page->flags & PAGE_FLAGS_CHECK_AT_PREP)))
+ (page->flags & PAGE_FLAGS_CHECK_AT_PREP))) {
bad_page(page);
-
- /*
- * For now, we report if PG_reserved was found set, but do not
- * clear it, and do not allocate the page: as a safety net.
- */
- if (PageReserved(page))
return 1;
+ }
- page->flags &= ~(1 << PG_uptodate | 1 << PG_error | 1 << PG_reclaim |
- 1 << PG_referenced | 1 << PG_arch_1 |
- 1 << PG_owner_priv_1 | 1 << PG_mappedtodisk
-#ifdef CONFIG_UNEVICTABLE_LRU
- | 1 << PG_mlocked
-#endif
- );
set_page_private(page, 0);
set_page_refcounted(page);
@@ -2609,6 +2621,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
unsigned long pfn;
struct zone *z;
+ if (highest_memmap_pfn < end_pfn - 1)
+ highest_memmap_pfn = end_pfn - 1;
+
z = &NODE_DATA(nid)->node_zones[zone];
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
/*
@@ -3381,10 +3396,8 @@ static void __init setup_usemap(struct pglist_data *pgdat,
{
unsigned long usemapsize = usemap_size(zonesize);
zone->pageblock_flags = NULL;
- if (usemapsize) {
+ if (usemapsize)
zone->pageblock_flags = alloc_bootmem_node(pgdat, usemapsize);
- memset(zone->pageblock_flags, 0, usemapsize);
- }
}
#else
static void inline setup_usemap(struct pglist_data *pgdat,
@@ -3469,9 +3482,10 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT;
if (realsize >= memmap_pages) {
realsize -= memmap_pages;
- printk(KERN_DEBUG
- " %s zone: %lu pages used for memmap\n",
- zone_names[j], memmap_pages);
+ if (memmap_pages)
+ printk(KERN_DEBUG
+ " %s zone: %lu pages used for memmap\n",
+ zone_names[j], memmap_pages);
} else
printk(KERN_WARNING
" %s zone: %lu pages exceeds realsize %lu\n",
@@ -4316,7 +4330,7 @@ void setup_per_zone_pages_min(void)
* 1TB 101 10GB
* 10TB 320 32GB
*/
-void setup_per_zone_inactive_ratio(void)
+static void setup_per_zone_inactive_ratio(void)
{
struct zone *zone;
@@ -4573,19 +4587,6 @@ void *__init alloc_large_system_hash(const char *tablename,
return table;
}
-#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE
-struct page *pfn_to_page(unsigned long pfn)
-{
- return __pfn_to_page(pfn);
-}
-unsigned long page_to_pfn(struct page *page)
-{
- return __page_to_pfn(page);
-}
-EXPORT_SYMBOL(pfn_to_page);
-EXPORT_SYMBOL(page_to_pfn);
-#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
-
/* Return a pointer to the bitmap storing bits affecting a block of pages */
static inline unsigned long *get_pageblock_bitmap(struct zone *zone,
unsigned long pfn)