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authorLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 17:52:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-08 17:52:23 -0700
commitf6f7a6369203fa3e07efb7f35cfd81efe9f25b07 (patch)
tree97bec9ddd999040822acf314647eaf4208213589 /mm/page_alloc.c
parent839fe9156fbe89c3157aa6146d22090f8cffddd8 (diff)
parentdf69f52d990bd85159727bd26e819d3a6e49c666 (diff)
downloadlinux-f6f7a6369203fa3e07efb7f35cfd81efe9f25b07.tar.bz2
Merge branch 'akpm' (patches from Andrew)
Merge second patch-bomb from Andrew Morton: "Almost all of the rest of MM. There was an unusually large amount of MM material this time" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (141 commits) zpool: remove no-op module init/exit mm: zbud: constify the zbud_ops mm: zpool: constify the zpool_ops mm: swap: zswap: maybe_preload & refactoring zram: unify error reporting zsmalloc: remove null check from destroy_handle_cache() zsmalloc: do not take class lock in zs_shrinker_count() zsmalloc: use class->pages_per_zspage zsmalloc: consider ZS_ALMOST_FULL as migrate source zsmalloc: partial page ordering within a fullness_list zsmalloc: use shrinker to trigger auto-compaction zsmalloc: account the number of compacted pages zsmalloc/zram: introduce zs_pool_stats api zsmalloc: cosmetic compaction code adjustments zsmalloc: introduce zs_can_compact() function zsmalloc: always keep per-class stats zsmalloc: drop unused variable `nr_to_migrate' mm/memblock.c: fix comment in __next_mem_range() mm/page_alloc.c: fix type information of memoryless node memory-hotplug: fix comments in zone_spanned_pages_in_node() and zone_spanned_pages_in_node() ...
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c80
1 files changed, 50 insertions, 30 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b401d40cb4fd..48aaf7b9f253 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -125,6 +125,24 @@ unsigned long dirty_balance_reserve __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
+/*
+ * A cached value of the page's pageblock's migratetype, used when the page is
+ * put on a pcplist. Used to avoid the pageblock migratetype lookup when
+ * freeing from pcplists in most cases, at the cost of possibly becoming stale.
+ * Also the migratetype set in the page does not necessarily match the pcplist
+ * index, e.g. page might have MIGRATE_CMA set but be on a pcplist with any
+ * other index - this ensures that it will be put on the correct CMA freelist.
+ */
+static inline int get_pcppage_migratetype(struct page *page)
+{
+ return page->index;
+}
+
+static inline void set_pcppage_migratetype(struct page *page, int migratetype)
+{
+ page->index = migratetype;
+}
+
#ifdef CONFIG_PM_SLEEP
/*
* The following functions are used by the suspend/hibernate code to temporarily
@@ -791,7 +809,11 @@ static void free_pcppages_bulk(struct zone *zone, int count,
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);
+
+ mt = get_pcppage_migratetype(page);
+ /* MIGRATE_ISOLATE page should not go to pcplists */
+ VM_BUG_ON_PAGE(is_migrate_isolate(mt), page);
+ /* Pageblock could have been isolated meanwhile */
if (unlikely(has_isolate_pageblock(zone)))
mt = get_pageblock_migratetype(page);
@@ -955,7 +977,6 @@ static void __free_pages_ok(struct page *page, unsigned int order)
migratetype = get_pfnblock_migratetype(page, pfn);
local_irq_save(flags);
__count_vm_events(PGFREE, 1 << order);
- set_freepage_migratetype(page, migratetype);
free_one_page(page_zone(page), page, pfn, order, migratetype);
local_irq_restore(flags);
}
@@ -1383,7 +1404,7 @@ struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
rmv_page_order(page);
area->nr_free--;
expand(zone, page, order, current_order, area, migratetype);
- set_freepage_migratetype(page, migratetype);
+ set_pcppage_migratetype(page, migratetype);
return page;
}
@@ -1460,7 +1481,6 @@ 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;
}
@@ -1630,14 +1650,13 @@ __rmqueue_fallback(struct zone *zone, unsigned int order, int start_migratetype)
expand(zone, page, order, current_order, area,
start_migratetype);
/*
- * The freepage_migratetype may differ from pageblock's
+ * The pcppage_migratetype may differ from pageblock's
* migratetype depending on the decisions in
- * try_to_steal_freepages(). This is OK as long as it
- * does not differ for MIGRATE_CMA pageblocks. For CMA
- * we need to make sure unallocated pages flushed from
- * pcp lists are returned to the correct freelist.
+ * find_suitable_fallback(). This is OK as long as it does not
+ * differ for MIGRATE_CMA pageblocks. Those can be used as
+ * fallback only via special __rmqueue_cma_fallback() function
*/
- set_freepage_migratetype(page, start_migratetype);
+ set_pcppage_migratetype(page, start_migratetype);
trace_mm_page_alloc_extfrag(page, order, current_order,
start_migratetype, fallback_mt);
@@ -1713,7 +1732,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
else
list_add_tail(&page->lru, list);
list = &page->lru;
- if (is_migrate_cma(get_freepage_migratetype(page)))
+ if (is_migrate_cma(get_pcppage_migratetype(page)))
__mod_zone_page_state(zone, NR_FREE_CMA_PAGES,
-(1 << order));
}
@@ -1910,7 +1929,7 @@ void free_hot_cold_page(struct page *page, bool cold)
return;
migratetype = get_pfnblock_migratetype(page, pfn);
- set_freepage_migratetype(page, migratetype);
+ set_pcppage_migratetype(page, migratetype);
local_irq_save(flags);
__count_vm_event(PGFREE);
@@ -2115,7 +2134,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
if (!page)
goto failed;
__mod_zone_freepage_state(zone, -(1 << order),
- get_freepage_migratetype(page));
+ get_pcppage_migratetype(page));
}
__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
@@ -2696,6 +2715,12 @@ static inline struct page *
__alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
const struct alloc_context *ac, unsigned long *did_some_progress)
{
+ struct oom_control oc = {
+ .zonelist = ac->zonelist,
+ .nodemask = ac->nodemask,
+ .gfp_mask = gfp_mask,
+ .order = order,
+ };
struct page *page;
*did_some_progress = 0;
@@ -2747,8 +2772,7 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order,
goto out;
}
/* Exhausted what can be done so it's blamo time */
- if (out_of_memory(ac->zonelist, gfp_mask, order, ac->nodemask, false)
- || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL))
+ if (out_of_memory(&oc) || WARN_ON_ONCE(gfp_mask & __GFP_NOFAIL))
*did_some_progress = 1;
out:
mutex_unlock(&oom_lock);
@@ -3490,8 +3514,6 @@ EXPORT_SYMBOL(alloc_pages_exact);
*
* Like alloc_pages_exact(), but try to allocate on node nid first before falling
* back.
- * Note this is not alloc_pages_exact_node() which allocates on a specific node,
- * but is not exact.
*/
void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
{
@@ -5066,7 +5088,7 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid,
{
unsigned long zone_start_pfn, zone_end_pfn;
- /* When hotadd a new node, the node should be empty */
+ /* When hotadd a new node from cpu_up(), the node should be empty */
if (!node_start_pfn && !node_end_pfn)
return 0;
@@ -5133,7 +5155,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid,
unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type];
unsigned long zone_start_pfn, zone_end_pfn;
- /* When hotadd a new node, the node should be empty */
+ /* When hotadd a new node from cpu_up(), the node should be empty */
if (!node_start_pfn && !node_end_pfn)
return 0;
@@ -5306,8 +5328,7 @@ static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages,
*
* NOTE: pgdat should get zeroed by caller.
*/
-static void __paginginit free_area_init_core(struct pglist_data *pgdat,
- unsigned long node_start_pfn, unsigned long node_end_pfn)
+static void __paginginit free_area_init_core(struct pglist_data *pgdat)
{
enum zone_type j;
int nid = pgdat->node_id;
@@ -5458,7 +5479,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
- (u64)start_pfn << PAGE_SHIFT, ((u64)end_pfn << PAGE_SHIFT) - 1);
+ (u64)start_pfn << PAGE_SHIFT,
+ end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
#endif
calculate_node_totalpages(pgdat, start_pfn, end_pfn,
zones_size, zholes_size);
@@ -5470,7 +5492,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
(unsigned long)pgdat->node_mem_map);
#endif
- free_area_init_core(pgdat, start_pfn, end_pfn);
+ free_area_init_core(pgdat);
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
@@ -5481,11 +5503,9 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
*/
void __init setup_nr_node_ids(void)
{
- unsigned int node;
- unsigned int highest = 0;
+ unsigned int highest;
- for_each_node_mask(node, node_possible_map)
- highest = node;
+ highest = find_last_bit(node_possible_map.bits, MAX_NUMNODES);
nr_node_ids = highest + 1;
}
#endif
@@ -6006,7 +6026,7 @@ void __init mem_init_print_info(const char *str)
* set_dma_reserve - set the specified number of pages reserved in the first zone
* @new_dma_reserve: The number of pages to mark reserved
*
- * The per-cpu batchsize and zone watermarks are determined by present_pages.
+ * The per-cpu batchsize and zone watermarks are determined by managed_pages.
* In the DMA zone, a significant percentage may be consumed by kernel image
* and other unfreeable allocations which can skew the watermarks badly. This
* function may optionally be used to account for unfreeable pages in the
@@ -6059,7 +6079,7 @@ void __init page_alloc_init(void)
}
/*
- * calculate_totalreserve_pages - called when sysctl_lower_zone_reserve_ratio
+ * calculate_totalreserve_pages - called when sysctl_lowmem_reserve_ratio
* or min_free_kbytes changes.
*/
static void calculate_totalreserve_pages(void)
@@ -6103,7 +6123,7 @@ static void calculate_totalreserve_pages(void)
/*
* setup_per_zone_lowmem_reserve - called whenever
- * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone
+ * sysctl_lowmem_reserve_ratio changes. Ensures that each zone
* has a correct pages reserved value, so an adequate number of
* pages are left in the zone after a successful __alloc_pages().
*/