static char *zone_names[MAX_NR_ZONES] = { "DMA", "Normal", "HighMem" };
int min_free_kbytes = 1024;
-static unsigned long __initdata nr_kernel_pages;
-static unsigned long __initdata nr_all_pages;
+unsigned long __initdata nr_kernel_pages;
+unsigned long __initdata nr_all_pages;
/*
* Temporary debugging check for pages not lying within a given zone.
{
printk(KERN_EMERG "Bad page state at %s (in process '%s', page %p)\n",
function, current->comm, page);
- printk(KERN_EMERG "flags:0x%08lx mapping:%p mapcount:%d count:%d\n",
- (unsigned long)page->flags, page->mapping,
- (int)page->mapcount, page_count(page));
+ printk(KERN_EMERG "flags:0x%0*lx mapping:%p mapcount:%d count:%d\n",
+ (int)(2*sizeof(page_flags_t)), (unsigned long)page->flags,
+ page->mapping, page_mapcount(page), page_count(page));
printk(KERN_EMERG "Backtrace:\n");
dump_stack();
printk(KERN_EMERG "Trying to fix it up, but a reboot is needed\n");
1 << PG_lru |
1 << PG_active |
1 << PG_dirty |
- 1 << PG_maplock |
- 1 << PG_anon |
1 << PG_swapcache |
1 << PG_writeback);
set_page_count(page, 0);
+ reset_page_mapcount(page);
page->mapping = NULL;
- page->mapcount = 0;
}
#ifndef CONFIG_HUGETLB_PAGE
1 << PG_active |
1 << PG_reclaim |
1 << PG_slab |
- 1 << PG_maplock |
- 1 << PG_anon |
1 << PG_swapcache |
1 << PG_writeback )))
bad_page(function, page);
LIST_HEAD(list);
int i;
+ arch_free_page(page, order);
+
mod_page_state(pgfree, 1 << order);
for (i = 0 ; i < (1 << order) ; ++i)
free_pages_check(__FUNCTION__, page + i);
1 << PG_active |
1 << PG_dirty |
1 << PG_reclaim |
- 1 << PG_maplock |
- 1 << PG_anon |
1 << PG_swapcache |
1 << PG_writeback )))
bad_page(__FUNCTION__, page);
struct per_cpu_pages *pcp;
unsigned long flags;
+ arch_free_page(page, 0);
+
kernel_map_pages(page, 1, 0);
inc_page_state(pgfree);
+ if (PageAnon(page))
+ page->mapping = NULL;
free_pages_check(__FUNCTION__, page);
pcp = &zone->pageset[get_cpu()].pcp[cold];
local_irq_save(flags);
{
const int wait = gfp_mask & __GFP_WAIT;
unsigned long min;
- struct zone **zones;
+ struct zone **zones, *z;
struct page *page;
struct reclaim_state reclaim_state;
struct task_struct *p = current;
int i;
int alloc_type;
int do_retry;
+ int can_try_harder;
might_sleep_if(wait);
+ /*
+ * The caller may dip into page reserves a bit more if the caller
+ * cannot run direct reclaim, or is the caller has realtime scheduling
+ * policy
+ */
+ can_try_harder = (unlikely(rt_task(p)) && !in_interrupt()) || !wait;
+
zones = zonelist->zones; /* the list of zones suitable for gfp_mask */
- if (zones[0] == NULL) /* no zones in the zonelist */
+
+ if (unlikely(zones[0] == NULL)) {
+ /* Should this ever happen?? */
return NULL;
+ }
alloc_type = zone_idx(zones[0]);
/* Go through the zonelist once, looking for a zone with enough free */
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *z = zones[i];
-
- min = (1<<order) + z->protection[alloc_type];
+ for (i = 0; (z = zones[i]) != NULL; i++) {
+ min = z->pages_low + (1<<order) + z->protection[alloc_type];
- /*
- * We let real-time tasks dip their real-time paws a little
- * deeper into reserves.
- */
- if (rt_task(p))
- min -= z->pages_low >> 1;
+ if (z->free_pages < min)
+ continue;
- if (z->free_pages >= min ||
- (!wait && z->free_pages >= z->pages_high)) {
- page = buffered_rmqueue(z, order, gfp_mask);
- if (page) {
- zone_statistics(zonelist, z);
- goto got_pg;
- }
- }
+ page = buffered_rmqueue(z, order, gfp_mask);
+ if (page)
+ goto got_pg;
}
- /* we're somewhat low on memory, failed to find what we needed */
- for (i = 0; zones[i] != NULL; i++)
- wakeup_kswapd(zones[i]);
-
- /* Go through the zonelist again, taking __GFP_HIGH into account */
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *z = zones[i];
-
- min = (1<<order) + z->protection[alloc_type];
+ for (i = 0; (z = zones[i]) != NULL; i++)
+ wakeup_kswapd(z);
+ /*
+ * Go through the zonelist again. Let __GFP_HIGH and allocations
+ * coming from realtime tasks to go deeper into reserves
+ */
+ for (i = 0; (z = zones[i]) != NULL; i++) {
+ min = z->pages_min;
if (gfp_mask & __GFP_HIGH)
- min -= z->pages_low >> 2;
- if (rt_task(p))
- min -= z->pages_low >> 1;
+ min /= 2;
+ if (can_try_harder)
+ min -= min / 4;
+ min += (1<<order) + z->protection[alloc_type];
- if (z->free_pages >= min ||
- (!wait && z->free_pages >= z->pages_high)) {
- page = buffered_rmqueue(z, order, gfp_mask);
- if (page) {
- zone_statistics(zonelist, z);
- goto got_pg;
- }
- }
- }
+ if (z->free_pages < min)
+ continue;
- /* here we're in the low on memory slow path */
+ page = buffered_rmqueue(z, order, gfp_mask);
+ if (page)
+ goto got_pg;
+ }
-rebalance:
+ /* This allocation should allow future memory freeing. */
if ((p->flags & (PF_MEMALLOC | PF_MEMDIE)) && !in_interrupt()) {
/* go through the zonelist yet again, ignoring mins */
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *z = zones[i];
-
+ for (i = 0; (z = zones[i]) != NULL; i++) {
page = buffered_rmqueue(z, order, gfp_mask);
- if (page) {
- zone_statistics(zonelist, z);
+ if (page)
goto got_pg;
- }
}
goto nopage;
}
if (!wait)
goto nopage;
+rebalance:
+ /* We now go into synchronous reclaim */
p->flags |= PF_MEMALLOC;
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;
p->flags &= ~PF_MEMALLOC;
/* go through the zonelist yet one more time */
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *z = zones[i];
+ for (i = 0; (z = zones[i]) != NULL; i++) {
+ min = z->pages_min;
+ if (gfp_mask & __GFP_HIGH)
+ min /= 2;
+ if (can_try_harder)
+ min -= min / 4;
+ min += (1<<order) + z->protection[alloc_type];
- min = (1UL << order) + z->protection[alloc_type];
+ if (z->free_pages < min)
+ continue;
- if (z->free_pages >= min ||
- (!wait && z->free_pages >= z->pages_high)) {
- page = buffered_rmqueue(z, order, gfp_mask);
- if (page) {
- zone_statistics(zonelist, z);
- goto got_pg;
- }
- }
+ page = buffered_rmqueue(z, order, gfp_mask);
+ if (page)
+ goto got_pg;
}
/*
* Don't let big-order allocations loop unless the caller explicitly
* requests that. Wait for some write requests to complete then retry.
*
- * In this implementation, __GFP_REPEAT means __GFP_NOFAIL, but that
- * may not be true in other implementations.
+ * In this implementation, __GFP_REPEAT means __GFP_NOFAIL for order
+ * <= 3, but that may not be true in other implementations.
*/
do_retry = 0;
if (!(gfp_mask & __GFP_NORETRY)) {
}
return NULL;
got_pg:
+ zone_statistics(zonelist, z);
kernel_map_pages(page, 1 << order, 1);
return page;
}
fastcall void free_pages(unsigned long addr, unsigned int order)
{
if (addr != 0) {
- BUG_ON(!virt_addr_valid(addr));
- __free_pages(virt_to_page(addr), order);
+ BUG_ON(!virt_addr_valid((void *)addr));
+ __free_pages(virt_to_page((void *)addr), order);
}
}
return ret;
}
+void __get_zone_counts(unsigned long *active, unsigned long *inactive,
+ unsigned long *free, struct pglist_data *pgdat)
+{
+ struct zone *zones = pgdat->node_zones;
+ int i;
+
+ *active = 0;
+ *inactive = 0;
+ *free = 0;
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ *active += zones[i].nr_active;
+ *inactive += zones[i].nr_inactive;
+ *free += zones[i].free_pages;
+ }
+}
+
void get_zone_counts(unsigned long *active,
unsigned long *inactive, unsigned long *free)
{
- struct zone *zone;
+ struct pglist_data *pgdat;
*active = 0;
*inactive = 0;
*free = 0;
- for_each_zone(zone) {
- *active += zone->nr_active;
- *inactive += zone->nr_inactive;
- *free += zone->free_pages;
+ for_each_pgdat(pgdat) {
+ unsigned long l, m, n;
+ __get_zone_counts(&l, &m, &n, pgdat);
+ *active += l;
+ *inactive += m;
+ *free += n;
}
}
* up by free_all_bootmem() once the early boot process is
* done. Non-atomic initialization, single-pass.
*/
-void __init memmap_init_zone(struct page *start, unsigned long size, int nid,
- unsigned long zone, unsigned long start_pfn)
+void __init memmap_init_zone(unsigned long size, int nid, unsigned long zone,
+ unsigned long start_pfn)
{
+ struct page *start = pfn_to_page(start_pfn);
struct page *page;
for (page = start; page < (start + size); page++) {
set_page_zone(page, NODEZONE(nid, zone));
set_page_count(page, 0);
+ reset_page_mapcount(page);
SetPageReserved(page);
INIT_LIST_HEAD(&page->lru);
#ifdef WANT_PAGE_VIRTUAL
}
}
+/*
+ * Page buddy system uses "index >> (i+1)", where "index" is
+ * at most "size-1".
+ *
+ * The extra "+3" is to round down to byte size (8 bits per byte
+ * assumption). Thus we get "(size-1) >> (i+4)" as the last byte
+ * we can access.
+ *
+ * The "+1" is because we want to round the byte allocation up
+ * rather than down. So we should have had a "+7" before we shifted
+ * down by three. Also, we have to add one as we actually _use_ the
+ * last bit (it's [0,n] inclusive, not [0,n[).
+ *
+ * So we actually had +7+1 before we shift down by 3. But
+ * (n+8) >> 3 == (n >> 3) + 1 (modulo overflows, which we do not have).
+ *
+ * Finally, we LONG_ALIGN because all bitmap operations are on longs.
+ */
+unsigned long pages_to_bitmap_size(unsigned long order, unsigned long nr_pages)
+{
+ unsigned long bitmap_size;
+
+ bitmap_size = (nr_pages-1) >> (order+4);
+ bitmap_size = LONG_ALIGN(bitmap_size+1);
+
+ return bitmap_size;
+}
+
+void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone, unsigned long size)
+{
+ int order;
+ for (order = 0; ; order++) {
+ unsigned long bitmap_size;
+
+ INIT_LIST_HEAD(&zone->free_area[order].free_list);
+ if (order == MAX_ORDER-1) {
+ zone->free_area[order].map = NULL;
+ break;
+ }
+
+ bitmap_size = pages_to_bitmap_size(order, size);
+ zone->free_area[order].map =
+ (unsigned long *) alloc_bootmem_node(pgdat, bitmap_size);
+ }
+}
+
#ifndef __HAVE_ARCH_MEMMAP_INIT
-#define memmap_init(start, size, nid, zone, start_pfn) \
- memmap_init_zone((start), (size), (nid), (zone), (start_pfn))
+#define memmap_init(size, nid, zone, start_pfn) \
+ memmap_init_zone((size), (nid), (zone), (start_pfn))
#endif
/*
unsigned long i, j;
const unsigned long zone_required_alignment = 1UL << (MAX_ORDER-1);
int cpu, nid = pgdat->node_id;
- struct page *lmem_map = pgdat->node_mem_map;
unsigned long zone_start_pfn = pgdat->node_start_pfn;
pgdat->nr_zones = 0;
pgdat->nr_zones = j+1;
- zone->zone_mem_map = lmem_map;
+ zone->zone_mem_map = pfn_to_page(zone_start_pfn);
zone->zone_start_pfn = zone_start_pfn;
if ((zone_start_pfn) & (zone_required_alignment-1))
printk("BUG: wrong zone alignment, it will crash\n");
- memmap_init(lmem_map, size, nid, j, zone_start_pfn);
+ memmap_init(size, nid, j, zone_start_pfn);
zone_start_pfn += size;
- lmem_map += size;
-
- for (i = 0; ; i++) {
- unsigned long bitmap_size;
-
- INIT_LIST_HEAD(&zone->free_area[i].free_list);
- if (i == MAX_ORDER-1) {
- zone->free_area[i].map = NULL;
- break;
- }
- /*
- * Page buddy system uses "index >> (i+1)",
- * where "index" is at most "size-1".
- *
- * The extra "+3" is to round down to byte
- * size (8 bits per byte assumption). Thus
- * we get "(size-1) >> (i+4)" as the last byte
- * we can access.
- *
- * The "+1" is because we want to round the
- * byte allocation up rather than down. So
- * we should have had a "+7" before we shifted
- * down by three. Also, we have to add one as
- * we actually _use_ the last bit (it's [0,n]
- * inclusive, not [0,n[).
- *
- * So we actually had +7+1 before we shift
- * down by 3. But (n+8) >> 3 == (n >> 3) + 1
- * (modulo overflows, which we do not have).
- *
- * Finally, we LONG_ALIGN because all bitmap
- * operations are on longs.
- */
- bitmap_size = (size-1) >> (i+4);
- bitmap_size = LONG_ALIGN(bitmap_size+1);
- zone->free_area[i].map =
- (unsigned long *) alloc_bootmem_node(pgdat, bitmap_size);
- }
+ zone_init_free_lists(pgdat, zone, zone->spanned_pages);
}
}
-void __init free_area_init_node(int nid, struct pglist_data *pgdat,
- struct page *node_mem_map, unsigned long *zones_size,
- unsigned long node_start_pfn, unsigned long *zholes_size)
+void __init node_alloc_mem_map(struct pglist_data *pgdat)
{
unsigned long size;
+ size = (pgdat->node_spanned_pages + 1) * sizeof(struct page);
+ pgdat->node_mem_map = alloc_bootmem_node(pgdat, size);
+#ifndef CONFIG_DISCONTIGMEM
+ mem_map = contig_page_data.node_mem_map;
+#endif
+}
+
+void __init free_area_init_node(int nid, struct pglist_data *pgdat,
+ unsigned long *zones_size, unsigned long node_start_pfn,
+ unsigned long *zholes_size)
+{
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
calculate_zone_totalpages(pgdat, zones_size, zholes_size);
- if (!node_mem_map) {
- size = (pgdat->node_spanned_pages + 1) * sizeof(struct page);
- node_mem_map = alloc_bootmem_node(pgdat, size);
- }
- pgdat->node_mem_map = node_mem_map;
+
+ if (!pfn_to_page(node_start_pfn))
+ node_alloc_mem_map(pgdat);
free_area_init_core(pgdat, zones_size, zholes_size);
}
void __init free_area_init(unsigned long *zones_size)
{
- free_area_init_node(0, &contig_page_data, NULL, zones_size,
+ free_area_init_node(0, &contig_page_data, zones_size,
__pa(PAGE_OFFSET) >> PAGE_SHIFT, NULL);
- mem_map = contig_page_data.node_mem_map;
}
#endif
* We never protect zones that don't have memory
* in them (j>max_zone) or zones that aren't in
* the zonelists for a certain type of
- * allocation (j>i). We have to assign these to
- * zero because the lower zones take
+ * allocation (j>=i). We have to assign these
+ * to zero because the lower zones take
* contributions from the higher zones.
*/
- if (j > max_zone || j > i) {
+ if (j > max_zone || j >= i) {
zone->protection[i] = 0;
continue;
}
*/
zone->protection[i] = higherzone_val(zone,
max_zone, i);
- zone->protection[i] += zone->pages_low;
}
}
}
unsigned int *_hash_shift,
unsigned int *_hash_mask)
{
- unsigned long mem, max, log2qty, size;
+ unsigned long long max;
+ unsigned long log2qty, size;
void *table;
- /* round applicable memory size up to nearest megabyte */
- mem = consider_highmem ? nr_all_pages : nr_kernel_pages;
- mem += (1UL << (20 - PAGE_SHIFT)) - 1;
- mem >>= 20 - PAGE_SHIFT;
- mem <<= 20 - PAGE_SHIFT;
-
- /* limit to 1 bucket per 2^scale bytes of low memory (rounded up to
- * nearest power of 2 in size) */
- if (scale > PAGE_SHIFT)
- mem >>= (scale - PAGE_SHIFT);
- else
- mem <<= (PAGE_SHIFT - scale);
-
- mem = 1UL << (long_log2(mem) + 1);
+ /* allow the kernel cmdline to have a say */
+ if (!numentries) {
+ /* round applicable memory size up to nearest megabyte */
+ numentries = consider_highmem ? nr_all_pages : nr_kernel_pages;
+ numentries += (1UL << (20 - PAGE_SHIFT)) - 1;
+ numentries >>= 20 - PAGE_SHIFT;
+ numentries <<= 20 - PAGE_SHIFT;
+
+ /* limit to 1 bucket per 2^scale bytes of low memory */
+ if (scale > PAGE_SHIFT)
+ numentries >>= (scale - PAGE_SHIFT);
+ else
+ numentries <<= (PAGE_SHIFT - scale);
+ }
+ /* rounded up to nearest power of 2 in size */
+ numentries = 1UL << (long_log2(numentries) + 1);
- /* limit allocation size */
- max = (1UL << (PAGE_SHIFT + MAX_SYS_HASH_TABLE_ORDER)) / bucketsize;
- if (max > mem)
- max = mem;
+ /* limit allocation size to 1/16 total memory */
+ max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
+ do_div(max, bucketsize);
- /* allow the kernel cmdline to have a say */
- if (!numentries || numentries > max)
+ if (numentries > max)
numentries = max;
log2qty = long_log2(numentries);
do {
size = bucketsize << log2qty;
-
- table = (void *) alloc_bootmem(size);
-
- } while (!table && size > PAGE_SIZE);
+ table = alloc_bootmem(size);
+ } while (!table && size > PAGE_SIZE && --log2qty);
if (!table)
panic("Failed to allocate %s hash table\n", tablename);
git://git.onelab.eu / linux-2.6.git / blobdiff