long nr_swap_pages;
int percpu_pagelist_fraction;
+#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
+int pageblock_order __read_mostly;
+#endif
+
static void __free_pages_ok(struct page *page, unsigned int order);
/*
/*
* Move the free pages in a range to the free lists of the requested type.
- * Note that start_page and end_pages are not aligned in a MAX_ORDER_NR_PAGES
+ * Note that start_page and end_pages are not aligned on a pageblock
* boundary. If alignment is required, use move_freepages_block()
*/
int move_freepages(struct zone *zone,
struct page *start_page, *end_page;
start_pfn = page_to_pfn(page);
- start_pfn = start_pfn & ~(MAX_ORDER_NR_PAGES-1);
+ start_pfn = start_pfn & ~(pageblock_nr_pages-1);
start_page = pfn_to_page(start_pfn);
- end_page = start_page + MAX_ORDER_NR_PAGES - 1;
- end_pfn = start_pfn + MAX_ORDER_NR_PAGES - 1;
+ end_page = start_page + pageblock_nr_pages - 1;
+ end_pfn = start_pfn + pageblock_nr_pages - 1;
/* Do not cross zone boundaries */
if (start_pfn < zone->zone_start_pfn)
* back for a reclaimable kernel allocation, be more
* agressive about taking ownership of free pages
*/
- if (unlikely(current_order >= MAX_ORDER / 2) ||
+ if (unlikely(current_order >= (pageblock_order >> 1)) ||
start_migratetype == MIGRATE_RECLAIMABLE) {
unsigned long pages;
pages = move_freepages_block(zone, page,
start_migratetype);
/* Claim the whole block if over half of it is free */
- if (pages >= (1 << (MAX_ORDER-2)))
+ if (pages >= (1 << (pageblock_order-1)))
set_pageblock_migratetype(page,
start_migratetype);
__mod_zone_page_state(zone, NR_FREE_PAGES,
-(1UL << order));
- if (current_order == MAX_ORDER - 1)
+ if (current_order == pageblock_order)
set_pageblock_migratetype(page,
start_migratetype);
* made on memory-hotadd so a system can start with mobility
* disabled and enable it later
*/
- if (vm_total_pages < (MAX_ORDER_NR_PAGES * MIGRATE_TYPES))
+ if (vm_total_pages < (pageblock_nr_pages * MIGRATE_TYPES))
page_group_by_mobility_disabled = 1;
else
page_group_by_mobility_disabled = 0;
#define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
/*
- * Mark a number of MAX_ORDER_NR_PAGES blocks as MIGRATE_RESERVE. The number
+ * Mark a number of pageblocks as MIGRATE_RESERVE. The number
* of blocks reserved is based on zone->pages_min. The memory within the
* reserve will tend to store contiguous free pages. Setting min_free_kbytes
* higher will lead to a bigger reserve which will get freed as contiguous
/* Get the start pfn, end pfn and the number of blocks to reserve */
start_pfn = zone->zone_start_pfn;
end_pfn = start_pfn + zone->spanned_pages;
- reserve = roundup(zone->pages_min, MAX_ORDER_NR_PAGES) >> (MAX_ORDER-1);
+ reserve = roundup(zone->pages_min, pageblock_nr_pages) >>
+ pageblock_order;
- for (pfn = start_pfn; pfn < end_pfn; pfn += MAX_ORDER_NR_PAGES) {
+ for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
if (!pfn_valid(pfn))
continue;
page = pfn_to_page(pfn);
* the start are marked MIGRATE_RESERVE by
* setup_zone_migrate_reserve()
*/
- if ((pfn & (MAX_ORDER_NR_PAGES-1)))
+ if ((pfn & (pageblock_nr_pages-1)))
set_pageblock_migratetype(page, MIGRATE_MOVABLE);
INIT_LIST_HEAD(&page->lru);
#ifndef CONFIG_SPARSEMEM
/*
* Calculate the size of the zone->blockflags rounded to an unsigned long
- * Start by making sure zonesize is a multiple of MAX_ORDER-1 by rounding up
- * Then figure 1 NR_PAGEBLOCK_BITS worth of bits per MAX_ORDER-1, finally
+ * Start by making sure zonesize is a multiple of pageblock_order by rounding
+ * up. Then use 1 NR_PAGEBLOCK_BITS worth of bits per pageblock, finally
* round what is now in bits to nearest long in bits, then return it in
* bytes.
*/
{
unsigned long usemapsize;
- usemapsize = roundup(zonesize, MAX_ORDER_NR_PAGES);
- usemapsize = usemapsize >> (MAX_ORDER-1);
+ usemapsize = roundup(zonesize, pageblock_nr_pages);
+ usemapsize = usemapsize >> pageblock_order;
usemapsize *= NR_PAGEBLOCK_BITS;
usemapsize = roundup(usemapsize, 8 * sizeof(unsigned long));
struct zone *zone, unsigned long zonesize) {}
#endif /* CONFIG_SPARSEMEM */
+#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
+/* Initialise the number of pages represented by NR_PAGEBLOCK_BITS */
+static inline void __init set_pageblock_order(unsigned int order)
+{
+ /* Check that pageblock_nr_pages has not already been setup */
+ if (pageblock_order)
+ return;
+
+ /*
+ * Assume the largest contiguous order of interest is a huge page.
+ * This value may be variable depending on boot parameters on IA64
+ */
+ pageblock_order = order;
+}
+#else /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
+
+/* Defined this way to avoid accidently referencing HUGETLB_PAGE_ORDER */
+#define set_pageblock_order(x) do {} while (0)
+
+#endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */
+
/*
* Set up the zone data structures:
* - mark all pages reserved
if (!size)
continue;
+ set_pageblock_order(HUGETLB_PAGE_ORDER);
setup_usemap(pgdat, zone, size);
ret = init_currently_empty_zone(zone, zone_start_pfn,
size, MEMMAP_EARLY);
{
#ifdef CONFIG_SPARSEMEM
pfn &= (PAGES_PER_SECTION-1);
- return (pfn >> (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS;
+ return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#else
pfn = pfn - zone->zone_start_pfn;
- return (pfn >> (MAX_ORDER-1)) * NR_PAGEBLOCK_BITS;
+ return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#endif /* CONFIG_SPARSEMEM */
}
/**
- * get_pageblock_flags_group - Return the requested group of flags for the MAX_ORDER_NR_PAGES block of pages
+ * get_pageblock_flags_group - Return the requested group of flags for the pageblock_nr_pages block of pages
* @page: The page within the block of interest
* @start_bitidx: The first bit of interest to retrieve
* @end_bitidx: The last bit of interest
}
/**
- * set_pageblock_flags_group - Set the requested group of flags for a MAX_ORDER_NR_PAGES block of pages
+ * set_pageblock_flags_group - Set the requested group of flags for a pageblock_nr_pages block of pages
* @page: The page within the block of interest
* @start_bitidx: The first bit of interest
* @end_bitidx: The last bit of interest
projects / linux-2.6 / blobdiff