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Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c319
1 files changed, 202 insertions, 117 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c13ea7538891..5b74de6702e0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -558,7 +558,8 @@ static inline void __free_one_page(struct page *page,
if (page_is_guard(buddy)) {
clear_page_guard_flag(buddy);
set_page_private(page, 0);
- __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
+ __mod_zone_freepage_state(zone, 1 << order,
+ migratetype);
} else {
list_del(&buddy->lru);
zone->free_area[order].nr_free--;
@@ -597,17 +598,6 @@ out:
zone->free_area[order].nr_free++;
}
-/*
- * free_page_mlock() -- clean up attempts to free and mlocked() page.
- * Page should not be on lru, so no need to fix that up.
- * free_pages_check() will verify...
- */
-static inline void free_page_mlock(struct page *page)
-{
- __dec_zone_page_state(page, NR_MLOCK);
- __count_vm_event(UNEVICTABLE_MLOCKFREED);
-}
-
static inline int free_pages_check(struct page *page)
{
if (unlikely(page_mapcount(page) |
@@ -668,12 +658,17 @@ static void free_pcppages_bulk(struct zone *zone, int count,
batch_free = to_free;
do {
+ int mt; /* migratetype of the to-be-freed page */
+
page = list_entry(list->prev, struct page, lru);
/* must delete as __free_one_page list manipulates */
list_del(&page->lru);
+ mt = get_freepage_migratetype(page);
/* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
- __free_one_page(page, zone, 0, page_private(page));
- trace_mm_page_pcpu_drain(page, 0, page_private(page));
+ __free_one_page(page, zone, 0, mt);
+ trace_mm_page_pcpu_drain(page, 0, mt);
+ if (is_migrate_cma(mt))
+ __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1);
} while (--to_free && --batch_free && !list_empty(list));
}
__mod_zone_page_state(zone, NR_FREE_PAGES, count);
@@ -688,7 +683,8 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
zone->pages_scanned = 0;
__free_one_page(page, zone, order, migratetype);
- __mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
+ if (unlikely(migratetype != MIGRATE_ISOLATE))
+ __mod_zone_freepage_state(zone, 1 << order, migratetype);
spin_unlock(&zone->lock);
}
@@ -721,17 +717,16 @@ static bool free_pages_prepare(struct page *page, unsigned int order)
static void __free_pages_ok(struct page *page, unsigned int order)
{
unsigned long flags;
- int wasMlocked = __TestClearPageMlocked(page);
+ int migratetype;
if (!free_pages_prepare(page, order))
return;
local_irq_save(flags);
- if (unlikely(wasMlocked))
- free_page_mlock(page);
__count_vm_events(PGFREE, 1 << order);
- free_one_page(page_zone(page), page, order,
- get_pageblock_migratetype(page));
+ migratetype = get_pageblock_migratetype(page);
+ set_freepage_migratetype(page, migratetype);
+ free_one_page(page_zone(page), page, order, migratetype);
local_irq_restore(flags);
}
@@ -811,7 +806,8 @@ static inline void expand(struct zone *zone, struct page *page,
set_page_guard_flag(&page[size]);
set_page_private(&page[size], high);
/* Guard pages are not available for any usage */
- __mod_zone_page_state(zone, NR_FREE_PAGES, -(1 << high));
+ __mod_zone_freepage_state(zone, -(1 << high),
+ migratetype);
continue;
}
#endif
@@ -915,7 +911,7 @@ static int fallbacks[MIGRATE_TYPES][4] = {
* Note that start_page and end_pages are not aligned on a pageblock
* boundary. If alignment is required, use move_freepages_block()
*/
-static int move_freepages(struct zone *zone,
+int move_freepages(struct zone *zone,
struct page *start_page, struct page *end_page,
int migratetype)
{
@@ -951,6 +947,7 @@ static int move_freepages(struct zone *zone,
order = page_order(page);
list_move(&page->lru,
&zone->free_area[order].free_list[migratetype]);
+ set_freepage_migratetype(page, migratetype);
page += 1 << order;
pages_moved += 1 << order;
}
@@ -1135,8 +1132,11 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
if (!is_migrate_cma(mt) && mt != MIGRATE_ISOLATE)
mt = migratetype;
}
- set_page_private(page, mt);
+ set_freepage_migratetype(page, mt);
list = &page->lru;
+ if (is_migrate_cma(mt))
+ __mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
+ -(1 << order));
}
__mod_zone_page_state(zone, NR_FREE_PAGES, -(i << order));
spin_unlock(&zone->lock);
@@ -1296,16 +1296,13 @@ void free_hot_cold_page(struct page *page, int cold)
struct per_cpu_pages *pcp;
unsigned long flags;
int migratetype;
- int wasMlocked = __TestClearPageMlocked(page);
if (!free_pages_prepare(page, 0))
return;
migratetype = get_pageblock_migratetype(page);
- set_page_private(page, migratetype);
+ set_freepage_migratetype(page, migratetype);
local_irq_save(flags);
- if (unlikely(wasMlocked))
- free_page_mlock(page);
__count_vm_event(PGFREE);
/*
@@ -1380,20 +1377,16 @@ void split_page(struct page *page, unsigned int order)
}
/*
- * Similar to split_page except the page is already free. As this is only
- * being used for migration, the migratetype of the block also changes.
- * As this is called with interrupts disabled, the caller is responsible
- * for calling arch_alloc_page() and kernel_map_page() after interrupts
- * are enabled.
- *
- * Note: this is probably too low level an operation for use in drivers.
- * Please consult with lkml before using this in your driver.
+ * Similar to the split_page family of functions except that the page
+ * required at the given order and being isolated now to prevent races
+ * with parallel allocators
*/
-int split_free_page(struct page *page)
+int capture_free_page(struct page *page, int alloc_order, int migratetype)
{
unsigned int order;
unsigned long watermark;
struct zone *zone;
+ int mt;
BUG_ON(!PageBuddy(page));
@@ -1409,12 +1402,16 @@ int split_free_page(struct page *page)
list_del(&page->lru);
zone->free_area[order].nr_free--;
rmv_page_order(page);
- __mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order));
- /* Split into individual pages */
- set_page_refcounted(page);
- split_page(page, order);
+ mt = get_pageblock_migratetype(page);
+ if (unlikely(mt != MIGRATE_ISOLATE))
+ __mod_zone_freepage_state(zone, -(1UL << order), mt);
+ if (alloc_order != order)
+ expand(zone, page, alloc_order, order,
+ &zone->free_area[order], migratetype);
+
+ /* Set the pageblock if the captured page is at least a pageblock */
if (order >= pageblock_order - 1) {
struct page *endpage = page + (1 << order) - 1;
for (; page < endpage; page += pageblock_nr_pages) {
@@ -1425,7 +1422,35 @@ int split_free_page(struct page *page)
}
}
- return 1 << order;
+ return 1UL << order;
+}
+
+/*
+ * Similar to split_page except the page is already free. As this is only
+ * being used for migration, the migratetype of the block also changes.
+ * As this is called with interrupts disabled, the caller is responsible
+ * for calling arch_alloc_page() and kernel_map_page() after interrupts
+ * are enabled.
+ *
+ * Note: this is probably too low level an operation for use in drivers.
+ * Please consult with lkml before using this in your driver.
+ */
+int split_free_page(struct page *page)
+{
+ unsigned int order;
+ int nr_pages;
+
+ BUG_ON(!PageBuddy(page));
+ order = page_order(page);
+
+ nr_pages = capture_free_page(page, order, 0);
+ if (!nr_pages)
+ return 0;
+
+ /* Split into individual pages */
+ set_page_refcounted(page);
+ split_page(page, order);
+ return nr_pages;
}
/*
@@ -1484,7 +1509,8 @@ again:
spin_unlock(&zone->lock);
if (!page)
goto failed;
- __mod_zone_page_state(zone, NR_FREE_PAGES, -(1 << order));
+ __mod_zone_freepage_state(zone, -(1 << order),
+ get_pageblock_migratetype(page));
}
__count_zone_vm_events(PGALLOC, zone, 1 << order);
@@ -1501,19 +1527,6 @@ failed:
return NULL;
}
-/* The ALLOC_WMARK bits are used as an index to zone->watermark */
-#define ALLOC_WMARK_MIN WMARK_MIN
-#define ALLOC_WMARK_LOW WMARK_LOW
-#define ALLOC_WMARK_HIGH WMARK_HIGH
-#define ALLOC_NO_WATERMARKS 0x04 /* don't check watermarks at all */
-
-/* Mask to get the watermark bits */
-#define ALLOC_WMARK_MASK (ALLOC_NO_WATERMARKS-1)
-
-#define ALLOC_HARDER 0x10 /* try to alloc harder */
-#define ALLOC_HIGH 0x20 /* __GFP_HIGH set */
-#define ALLOC_CPUSET 0x40 /* check for correct cpuset */
-
#ifdef CONFIG_FAIL_PAGE_ALLOC
static struct {
@@ -1608,7 +1621,11 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark,
min -= min / 2;
if (alloc_flags & ALLOC_HARDER)
min -= min / 4;
-
+#ifdef CONFIG_CMA
+ /* If allocation can't use CMA areas don't use free CMA pages */
+ if (!(alloc_flags & ALLOC_CMA))
+ free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES);
+#endif
if (free_pages <= min + lowmem_reserve)
return false;
for (o = 0; o < order; o++) {
@@ -1782,6 +1799,22 @@ static void zlc_clear_zones_full(struct zonelist *zonelist)
bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
}
+static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
+{
+ return node_isset(local_zone->node, zone->zone_pgdat->reclaim_nodes);
+}
+
+static void __paginginit init_zone_allows_reclaim(int nid)
+{
+ int i;
+
+ for_each_online_node(i)
+ if (node_distance(nid, i) <= RECLAIM_DISTANCE)
+ node_set(i, NODE_DATA(nid)->reclaim_nodes);
+ else
+ zone_reclaim_mode = 1;
+}
+
#else /* CONFIG_NUMA */
static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags)
@@ -1802,6 +1835,15 @@ static void zlc_mark_zone_full(struct zonelist *zonelist, struct zoneref *z)
static void zlc_clear_zones_full(struct zonelist *zonelist)
{
}
+
+static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
+{
+ return true;
+}
+
+static inline void init_zone_allows_reclaim(int nid)
+{
+}
#endif /* CONFIG_NUMA */
/*
@@ -1886,7 +1928,8 @@ zonelist_scan:
did_zlc_setup = 1;
}
- if (zone_reclaim_mode == 0)
+ if (zone_reclaim_mode == 0 ||
+ !zone_allows_reclaim(preferred_zone, zone))
goto this_zone_full;
/*
@@ -2105,7 +2148,7 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
bool *contended_compaction, bool *deferred_compaction,
unsigned long *did_some_progress)
{
- struct page *page;
+ struct page *page = NULL;
if (!order)
return NULL;
@@ -2118,10 +2161,16 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
current->flags |= PF_MEMALLOC;
*did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask,
nodemask, sync_migration,
- contended_compaction);
+ contended_compaction, &page);
current->flags &= ~PF_MEMALLOC;
- if (*did_some_progress != COMPACT_SKIPPED) {
+ /* If compaction captured a page, prep and use it */
+ if (page) {
+ prep_new_page(page, order, gfp_mask);
+ goto got_page;
+ }
+
+ if (*did_some_progress != COMPACT_SKIPPED) {
/* Page migration frees to the PCP lists but we want merging */
drain_pages(get_cpu());
put_cpu();
@@ -2131,6 +2180,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
alloc_flags & ~ALLOC_NO_WATERMARKS,
preferred_zone, migratetype);
if (page) {
+got_page:
+ preferred_zone->compact_blockskip_flush = false;
preferred_zone->compact_considered = 0;
preferred_zone->compact_defer_shift = 0;
if (order >= preferred_zone->compact_order_failed)
@@ -2315,7 +2366,10 @@ gfp_to_alloc_flags(gfp_t gfp_mask)
unlikely(test_thread_flag(TIF_MEMDIE))))
alloc_flags |= ALLOC_NO_WATERMARKS;
}
-
+#ifdef CONFIG_CMA
+ if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
+ alloc_flags |= ALLOC_CMA;
+#endif
return alloc_flags;
}
@@ -2362,9 +2416,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
goto nopage;
restart:
- if (!(gfp_mask & __GFP_NO_KSWAPD))
- wake_all_kswapd(order, zonelist, high_zoneidx,
- zone_idx(preferred_zone));
+ wake_all_kswapd(order, zonelist, high_zoneidx,
+ zone_idx(preferred_zone));
/*
* OK, we're below the kswapd watermark and have kicked background
@@ -2441,7 +2494,7 @@ rebalance:
* system then fail the allocation instead of entering direct reclaim.
*/
if ((deferred_compaction || contended_compaction) &&
- (gfp_mask & __GFP_NO_KSWAPD))
+ (gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE)
goto nopage;
/* Try direct reclaim and then allocating */
@@ -2541,6 +2594,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
struct page *page = NULL;
int migratetype = allocflags_to_migratetype(gfp_mask);
unsigned int cpuset_mems_cookie;
+ int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET;
gfp_mask &= gfp_allowed_mask;
@@ -2569,9 +2623,13 @@ retry_cpuset:
if (!preferred_zone)
goto out;
+#ifdef CONFIG_CMA
+ if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
+ alloc_flags |= ALLOC_CMA;
+#endif
/* First allocation attempt */
page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order,
- zonelist, high_zoneidx, ALLOC_WMARK_LOW|ALLOC_CPUSET,
+ zonelist, high_zoneidx, alloc_flags,
preferred_zone, migratetype);
if (unlikely(!page))
page = __alloc_pages_slowpath(gfp_mask, order,
@@ -2852,7 +2910,8 @@ void show_free_areas(unsigned int filter)
" unevictable:%lu"
" dirty:%lu writeback:%lu unstable:%lu\n"
" free:%lu slab_reclaimable:%lu slab_unreclaimable:%lu\n"
- " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n",
+ " mapped:%lu shmem:%lu pagetables:%lu bounce:%lu\n"
+ " free_cma:%lu\n",
global_page_state(NR_ACTIVE_ANON),
global_page_state(NR_INACTIVE_ANON),
global_page_state(NR_ISOLATED_ANON),
@@ -2869,7 +2928,8 @@ void show_free_areas(unsigned int filter)
global_page_state(NR_FILE_MAPPED),
global_page_state(NR_SHMEM),
global_page_state(NR_PAGETABLE),
- global_page_state(NR_BOUNCE));
+ global_page_state(NR_BOUNCE),
+ global_page_state(NR_FREE_CMA_PAGES));
for_each_populated_zone(zone) {
int i;
@@ -2901,6 +2961,7 @@ void show_free_areas(unsigned int filter)
" pagetables:%lukB"
" unstable:%lukB"
" bounce:%lukB"
+ " free_cma:%lukB"
" writeback_tmp:%lukB"
" pages_scanned:%lu"
" all_unreclaimable? %s"
@@ -2930,6 +2991,7 @@ void show_free_areas(unsigned int filter)
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_UNSTABLE_NFS)),
K(zone_page_state(zone, NR_BOUNCE)),
+ K(zone_page_state(zone, NR_FREE_CMA_PAGES)),
K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
zone->pages_scanned,
(zone->all_unreclaimable ? "yes" : "no")
@@ -3328,21 +3390,13 @@ static void build_zonelists(pg_data_t *pgdat)
j = 0;
while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
- int distance = node_distance(local_node, node);
-
- /*
- * If another node is sufficiently far away then it is better
- * to reclaim pages in a zone before going off node.
- */
- if (distance > RECLAIM_DISTANCE)
- zone_reclaim_mode = 1;
-
/*
* We don't want to pressure a particular node.
* So adding penalty to the first node in same
* distance group to make it round-robin.
*/
- if (distance != node_distance(local_node, prev_node))
+ if (node_distance(local_node, node) !=
+ node_distance(local_node, prev_node))
node_load[node] = load;
prev_node = node;
@@ -4438,11 +4492,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
zone->spanned_pages = size;
zone->present_pages = realsize;
-#if defined CONFIG_COMPACTION || defined CONFIG_CMA
- zone->compact_cached_free_pfn = zone->zone_start_pfn +
- zone->spanned_pages;
- zone->compact_cached_free_pfn &= ~(pageblock_nr_pages-1);
-#endif
#ifdef CONFIG_NUMA
zone->node = nid;
zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio)
@@ -4521,6 +4570,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
+ init_zone_allows_reclaim(nid);
calculate_node_totalpages(pgdat, zones_size, zholes_size);
alloc_node_mem_map(pgdat);
@@ -4879,7 +4929,7 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
zone_movable_pfn[i] << PAGE_SHIFT);
}
- /* Print out the early_node_map[] */
+ /* Print out the early node map */
printk("Early memory node ranges\n");
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, &nid)
printk(" node %3d: [mem %#010lx-%#010lx]\n", nid,
@@ -5619,47 +5669,28 @@ static unsigned long pfn_max_align_up(unsigned long pfn)
pageblock_nr_pages));
}
-static struct page *
-__alloc_contig_migrate_alloc(struct page *page, unsigned long private,
- int **resultp)
-{
- gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;
-
- if (PageHighMem(page))
- gfp_mask |= __GFP_HIGHMEM;
-
- return alloc_page(gfp_mask);
-}
-
/* [start, end) must belong to a single zone. */
-static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
+static int __alloc_contig_migrate_range(struct compact_control *cc,
+ unsigned long start, unsigned long end)
{
/* This function is based on compact_zone() from compaction.c. */
-
+ unsigned long nr_reclaimed;
unsigned long pfn = start;
unsigned int tries = 0;
int ret = 0;
- struct compact_control cc = {
- .nr_migratepages = 0,
- .order = -1,
- .zone = page_zone(pfn_to_page(start)),
- .sync = true,
- };
- INIT_LIST_HEAD(&cc.migratepages);
-
migrate_prep_local();
- while (pfn < end || !list_empty(&cc.migratepages)) {
+ while (pfn < end || !list_empty(&cc->migratepages)) {
if (fatal_signal_pending(current)) {
ret = -EINTR;
break;
}
- if (list_empty(&cc.migratepages)) {
- cc.nr_migratepages = 0;
- pfn = isolate_migratepages_range(cc.zone, &cc,
- pfn, end);
+ if (list_empty(&cc->migratepages)) {
+ cc->nr_migratepages = 0;
+ pfn = isolate_migratepages_range(cc->zone, cc,
+ pfn, end, true);
if (!pfn) {
ret = -EINTR;
break;
@@ -5670,12 +5701,16 @@ static int __alloc_contig_migrate_range(unsigned long start, unsigned long end)
break;
}
- ret = migrate_pages(&cc.migratepages,
- __alloc_contig_migrate_alloc,
+ nr_reclaimed = reclaim_clean_pages_from_list(cc->zone,
+ &cc->migratepages);
+ cc->nr_migratepages -= nr_reclaimed;
+
+ ret = migrate_pages(&cc->migratepages,
+ alloc_migrate_target,
0, false, MIGRATE_SYNC);
}
- putback_lru_pages(&cc.migratepages);
+ putback_lru_pages(&cc->migratepages);
return ret > 0 ? 0 : ret;
}
@@ -5754,6 +5789,15 @@ int alloc_contig_range(unsigned long start, unsigned long end,
unsigned long outer_start, outer_end;
int ret = 0, order;
+ struct compact_control cc = {
+ .nr_migratepages = 0,
+ .order = -1,
+ .zone = page_zone(pfn_to_page(start)),
+ .sync = true,
+ .ignore_skip_hint = true,
+ };
+ INIT_LIST_HEAD(&cc.migratepages);
+
/*
* What we do here is we mark all pageblocks in range as
* MIGRATE_ISOLATE. Because pageblock and max order pages may
@@ -5781,9 +5825,9 @@ int alloc_contig_range(unsigned long start, unsigned long end,
ret = start_isolate_page_range(pfn_max_align_down(start),
pfn_max_align_up(end), migratetype);
if (ret)
- goto done;
+ return ret;
- ret = __alloc_contig_migrate_range(start, end);
+ ret = __alloc_contig_migrate_range(&cc, start, end);
if (ret)
goto done;
@@ -5832,7 +5876,7 @@ int alloc_contig_range(unsigned long start, unsigned long end,
__reclaim_pages(zone, GFP_HIGHUSER_MOVABLE, end-start);
/* Grab isolated pages from freelists. */
- outer_end = isolate_freepages_range(outer_start, end);
+ outer_end = isolate_freepages_range(&cc, outer_start, end);
if (!outer_end) {
ret = -EBUSY;
goto done;
@@ -5874,6 +5918,7 @@ static int __meminit __zone_pcp_update(void *data)
local_irq_save(flags);
if (pcp->count > 0)
free_pcppages_bulk(zone, pcp->count, pcp);
+ drain_zonestat(zone, pset);
setup_pageset(pset, batch);
local_irq_restore(flags);
}
@@ -5890,10 +5935,16 @@ void __meminit zone_pcp_update(struct zone *zone)
void zone_pcp_reset(struct zone *zone)
{
unsigned long flags;
+ int cpu;
+ struct per_cpu_pageset *pset;
/* avoid races with drain_pages() */
local_irq_save(flags);
if (zone->pageset != &boot_pageset) {
+ for_each_online_cpu(cpu) {
+ pset = per_cpu_ptr(zone->pageset, cpu);
+ drain_zonestat(zone, pset);
+ }
free_percpu(zone->pageset);
zone->pageset = &boot_pageset;
}
@@ -6047,3 +6098,37 @@ void dump_page(struct page *page)
dump_page_flags(page->flags);
mem_cgroup_print_bad_page(page);
}
+
+/* reset zone->present_pages */
+void reset_zone_present_pages(void)
+{
+ struct zone *z;
+ int i, nid;
+
+ for_each_node_state(nid, N_HIGH_MEMORY) {
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ z = NODE_DATA(nid)->node_zones + i;
+ z->present_pages = 0;
+ }
+ }
+}
+
+/* calculate zone's present pages in buddy system */
+void fixup_zone_present_pages(int nid, unsigned long start_pfn,
+ unsigned long end_pfn)
+{
+ struct zone *z;
+ unsigned long zone_start_pfn, zone_end_pfn;
+ int i;
+
+ for (i = 0; i < MAX_NR_ZONES; i++) {
+ z = NODE_DATA(nid)->node_zones + i;
+ zone_start_pfn = z->zone_start_pfn;
+ zone_end_pfn = zone_start_pfn + z->spanned_pages;
+
+ /* if the two regions intersect */
+ if (!(zone_start_pfn >= end_pfn || zone_end_pfn <= start_pfn))
+ z->present_pages += min(end_pfn, zone_end_pfn) -
+ max(start_pfn, zone_start_pfn);
+ }
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-23 19:52:04 +0300