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Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c171
1 files changed, 119 insertions, 52 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f9e450c6b6e4..bd65b60939b6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -113,9 +113,7 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = {
#ifdef CONFIG_HIGHMEM
[N_HIGH_MEMORY] = { { [0] = 1UL } },
#endif
-#ifdef CONFIG_MOVABLE_NODE
[N_MEMORY] = { { [0] = 1UL } },
-#endif
[N_CPU] = { { [0] = 1UL } },
#endif /* NUMA */
};
@@ -292,6 +290,26 @@ int page_group_by_mobility_disabled __read_mostly;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
static inline void reset_deferred_meminit(pg_data_t *pgdat)
{
+ unsigned long max_initialise;
+ unsigned long reserved_lowmem;
+
+ /*
+ * Initialise at least 2G of a node but also take into account that
+ * two large system hashes that can take up 1GB for 0.25TB/node.
+ */
+ max_initialise = max(2UL << (30 - PAGE_SHIFT),
+ (pgdat->node_spanned_pages >> 8));
+
+ /*
+ * Compensate the all the memblock reservations (e.g. crash kernel)
+ * from the initial estimation to make sure we will initialize enough
+ * memory to boot.
+ */
+ reserved_lowmem = memblock_reserved_memory_within(pgdat->node_start_pfn,
+ pgdat->node_start_pfn + max_initialise);
+ max_initialise += reserved_lowmem;
+
+ pgdat->static_init_size = min(max_initialise, pgdat->node_spanned_pages);
pgdat->first_deferred_pfn = ULONG_MAX;
}
@@ -314,20 +332,11 @@ static inline bool update_defer_init(pg_data_t *pgdat,
unsigned long pfn, unsigned long zone_end,
unsigned long *nr_initialised)
{
- unsigned long max_initialise;
-
/* Always populate low zones for address-contrained allocations */
if (zone_end < pgdat_end_pfn(pgdat))
return true;
- /*
- * Initialise at least 2G of a node but also take into account that
- * two large system hashes that can take up 1GB for 0.25TB/node.
- */
- max_initialise = max(2UL << (30 - PAGE_SHIFT),
- (pgdat->node_spanned_pages >> 8));
-
(*nr_initialised)++;
- if ((*nr_initialised > max_initialise) &&
+ if ((*nr_initialised > pgdat->static_init_size) &&
(pfn & (PAGES_PER_SECTION - 1)) == 0) {
pgdat->first_deferred_pfn = pfn;
return false;
@@ -500,7 +509,7 @@ static int page_is_consistent(struct zone *zone, struct page *page)
/*
* Temporary debugging check for pages not lying within a given zone.
*/
-static int bad_range(struct zone *zone, struct page *page)
+static int __maybe_unused bad_range(struct zone *zone, struct page *page)
{
if (page_outside_zone_boundaries(zone, page))
return 1;
@@ -510,7 +519,7 @@ static int bad_range(struct zone *zone, struct page *page)
return 0;
}
#else
-static inline int bad_range(struct zone *zone, struct page *page)
+static inline int __maybe_unused bad_range(struct zone *zone, struct page *page)
{
return 0;
}
@@ -1286,8 +1295,9 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
#endif
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
-static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node,
- struct mminit_pfnnid_cache *state)
+static inline bool __meminit __maybe_unused
+meminit_pfn_in_nid(unsigned long pfn, int node,
+ struct mminit_pfnnid_cache *state)
{
int nid;
@@ -1309,8 +1319,9 @@ static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
{
return true;
}
-static inline bool __meminit meminit_pfn_in_nid(unsigned long pfn, int node,
- struct mminit_pfnnid_cache *state)
+static inline bool __meminit __maybe_unused
+meminit_pfn_in_nid(unsigned long pfn, int node,
+ struct mminit_pfnnid_cache *state)
{
return true;
}
@@ -1354,7 +1365,9 @@ struct page *__pageblock_pfn_to_page(unsigned long start_pfn,
if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn))
return NULL;
- start_page = pfn_to_page(start_pfn);
+ start_page = pfn_to_online_page(start_pfn);
+ if (!start_page)
+ return NULL;
if (page_zone(start_page) != zone)
return NULL;
@@ -3662,6 +3675,39 @@ should_reclaim_retry(gfp_t gfp_mask, unsigned order,
return false;
}
+static inline bool
+check_retry_cpuset(int cpuset_mems_cookie, struct alloc_context *ac)
+{
+ /*
+ * It's possible that cpuset's mems_allowed and the nodemask from
+ * mempolicy don't intersect. This should be normally dealt with by
+ * policy_nodemask(), but it's possible to race with cpuset update in
+ * such a way the check therein was true, and then it became false
+ * before we got our cpuset_mems_cookie here.
+ * This assumes that for all allocations, ac->nodemask can come only
+ * from MPOL_BIND mempolicy (whose documented semantics is to be ignored
+ * when it does not intersect with the cpuset restrictions) or the
+ * caller can deal with a violated nodemask.
+ */
+ if (cpusets_enabled() && ac->nodemask &&
+ !cpuset_nodemask_valid_mems_allowed(ac->nodemask)) {
+ ac->nodemask = NULL;
+ return true;
+ }
+
+ /*
+ * When updating a task's mems_allowed or mempolicy nodemask, it is
+ * possible to race with parallel threads in such a way that our
+ * allocation can fail while the mask is being updated. If we are about
+ * to fail, check if the cpuset changed during allocation and if so,
+ * retry.
+ */
+ if (read_mems_allowed_retry(cpuset_mems_cookie))
+ return true;
+
+ return false;
+}
+
static inline struct page *
__alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
struct alloc_context *ac)
@@ -3857,11 +3903,9 @@ retry:
&compaction_retries))
goto retry;
- /*
- * It's possible we raced with cpuset update so the OOM would be
- * premature (see below the nopage: label for full explanation).
- */
- if (read_mems_allowed_retry(cpuset_mems_cookie))
+
+ /* Deal with possible cpuset update races before we start OOM killing */
+ if (check_retry_cpuset(cpuset_mems_cookie, ac))
goto retry_cpuset;
/* Reclaim has failed us, start killing things */
@@ -3870,7 +3914,9 @@ retry:
goto got_pg;
/* Avoid allocations with no watermarks from looping endlessly */
- if (test_thread_flag(TIF_MEMDIE))
+ if (test_thread_flag(TIF_MEMDIE) &&
+ (alloc_flags == ALLOC_NO_WATERMARKS ||
+ (gfp_mask & __GFP_NOMEMALLOC)))
goto nopage;
/* Retry as long as the OOM killer is making progress */
@@ -3880,14 +3926,8 @@ retry:
}
nopage:
- /*
- * When updating a task's mems_allowed or mempolicy nodemask, it is
- * possible to race with parallel threads in such a way that our
- * allocation can fail while the mask is being updated. If we are about
- * to fail, check if the cpuset changed during allocation and if so,
- * retry.
- */
- if (read_mems_allowed_retry(cpuset_mems_cookie))
+ /* Deal with possible cpuset update races before we fail */
+ if (check_retry_cpuset(cpuset_mems_cookie, ac))
goto retry_cpuset;
/*
@@ -3938,12 +3978,12 @@ got_pg:
}
static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist, nodemask_t *nodemask,
+ int preferred_nid, nodemask_t *nodemask,
struct alloc_context *ac, gfp_t *alloc_mask,
unsigned int *alloc_flags)
{
ac->high_zoneidx = gfp_zone(gfp_mask);
- ac->zonelist = zonelist;
+ ac->zonelist = node_zonelist(preferred_nid, gfp_mask);
ac->nodemask = nodemask;
ac->migratetype = gfpflags_to_migratetype(gfp_mask);
@@ -3988,8 +4028,8 @@ static inline void finalise_ac(gfp_t gfp_mask,
* This is the 'heart' of the zoned buddy allocator.
*/
struct page *
-__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
- struct zonelist *zonelist, nodemask_t *nodemask)
+__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
+ nodemask_t *nodemask)
{
struct page *page;
unsigned int alloc_flags = ALLOC_WMARK_LOW;
@@ -3997,7 +4037,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
struct alloc_context ac = { };
gfp_mask &= gfp_allowed_mask;
- if (!prepare_alloc_pages(gfp_mask, order, zonelist, nodemask, &ac, &alloc_mask, &alloc_flags))
+ if (!prepare_alloc_pages(gfp_mask, order, preferred_nid, nodemask, &ac, &alloc_mask, &alloc_flags))
return NULL;
finalise_ac(gfp_mask, order, &ac);
@@ -4601,8 +4641,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
" present:%lukB"
" managed:%lukB"
" mlocked:%lukB"
- " slab_reclaimable:%lukB"
- " slab_unreclaimable:%lukB"
" kernel_stack:%lukB"
" pagetables:%lukB"
" bounce:%lukB"
@@ -4624,8 +4662,6 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask)
K(zone->present_pages),
K(zone->managed_pages),
K(zone_page_state(zone, NR_MLOCK)),
- K(zone_page_state(zone, NR_SLAB_RECLAIMABLE)),
- K(zone_page_state(zone, NR_SLAB_UNRECLAIMABLE)),
zone_page_state(zone, NR_KERNEL_STACK_KB),
K(zone_page_state(zone, NR_PAGETABLE)),
K(zone_page_state(zone, NR_BOUNCE)),
@@ -5111,6 +5147,7 @@ static void build_zonelists(pg_data_t *pgdat)
*/
static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
+static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
static void setup_zone_pageset(struct zone *zone);
/*
@@ -5515,7 +5552,7 @@ static __meminit void zone_pcp_init(struct zone *zone)
zone_batchsize(zone));
}
-int __meminit init_currently_empty_zone(struct zone *zone,
+void __meminit init_currently_empty_zone(struct zone *zone,
unsigned long zone_start_pfn,
unsigned long size)
{
@@ -5533,8 +5570,6 @@ int __meminit init_currently_empty_zone(struct zone *zone,
zone_init_free_lists(zone);
zone->initialized = 1;
-
- return 0;
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
@@ -5992,7 +6027,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
{
enum zone_type j;
int nid = pgdat->node_id;
- int ret;
pgdat_resize_init(pgdat);
#ifdef CONFIG_NUMA_BALANCING
@@ -6014,6 +6048,8 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
spin_lock_init(&pgdat->lru_lock);
lruvec_init(node_lruvec(pgdat));
+ pgdat->per_cpu_nodestats = &boot_nodestats;
+
for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j;
unsigned long size, realsize, freesize, memmap_pages;
@@ -6074,8 +6110,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat)
set_pageblock_order();
setup_usemap(pgdat, zone, zone_start_pfn, size);
- ret = init_currently_empty_zone(zone, zone_start_pfn, size);
- BUG_ON(ret);
+ init_currently_empty_zone(zone, zone_start_pfn, size);
memmap_init(size, nid, j, zone_start_pfn);
}
}
@@ -6136,7 +6171,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
/* pg_data_t should be reset to zero when it's allocated */
WARN_ON(pgdat->nr_zones || pgdat->kswapd_classzone_idx);
- reset_deferred_meminit(pgdat);
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
pgdat->per_cpu_nodestats = NULL;
@@ -6158,6 +6192,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
(unsigned long)pgdat->node_mem_map);
#endif
+ reset_deferred_meminit(pgdat);
free_area_init_core(pgdat);
}
@@ -7169,6 +7204,21 @@ static unsigned long __init arch_reserved_kernel_pages(void)
#endif
/*
+ * Adaptive scale is meant to reduce sizes of hash tables on large memory
+ * machines. As memory size is increased the scale is also increased but at
+ * slower pace. Starting from ADAPT_SCALE_BASE (64G), every time memory
+ * quadruples the scale is increased by one, which means the size of hash table
+ * only doubles, instead of quadrupling as well.
+ * Because 32-bit systems cannot have large physical memory, where this scaling
+ * makes sense, it is disabled on such platforms.
+ */
+#if __BITS_PER_LONG > 32
+#define ADAPT_SCALE_BASE (64ul << 30)
+#define ADAPT_SCALE_SHIFT 2
+#define ADAPT_SCALE_NPAGES (ADAPT_SCALE_BASE >> PAGE_SHIFT)
+#endif
+
+/*
* allocate a large system hash table from bootmem
* - it is assumed that the hash table must contain an exact power-of-2
* quantity of entries
@@ -7187,6 +7237,7 @@ void *__init alloc_large_system_hash(const char *tablename,
unsigned long long max = high_limit;
unsigned long log2qty, size;
void *table = NULL;
+ gfp_t gfp_flags;
/* allow the kernel cmdline to have a say */
if (!numentries) {
@@ -7198,6 +7249,16 @@ void *__init alloc_large_system_hash(const char *tablename,
if (PAGE_SHIFT < 20)
numentries = round_up(numentries, (1<<20)/PAGE_SIZE);
+#if __BITS_PER_LONG > 32
+ if (!high_limit) {
+ unsigned long adapt;
+
+ for (adapt = ADAPT_SCALE_NPAGES; adapt < numentries;
+ adapt <<= ADAPT_SCALE_SHIFT)
+ scale++;
+ }
+#endif
+
/* limit to 1 bucket per 2^scale bytes of low memory */
if (scale > PAGE_SHIFT)
numentries >>= (scale - PAGE_SHIFT);
@@ -7231,12 +7292,17 @@ void *__init alloc_large_system_hash(const char *tablename,
log2qty = ilog2(numentries);
+ /*
+ * memblock allocator returns zeroed memory already, so HASH_ZERO is
+ * currently not used when HASH_EARLY is specified.
+ */
+ gfp_flags = (flags & HASH_ZERO) ? GFP_ATOMIC | __GFP_ZERO : GFP_ATOMIC;
do {
size = bucketsize << log2qty;
if (flags & HASH_EARLY)
table = memblock_virt_alloc_nopanic(size, 0);
else if (hashdist)
- table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
+ table = __vmalloc(size, gfp_flags, PAGE_KERNEL);
else {
/*
* If bucketsize is not a power-of-two, we may free
@@ -7244,8 +7310,8 @@ void *__init alloc_large_system_hash(const char *tablename,
* alloc_pages_exact() automatically does
*/
if (get_order(size) < MAX_ORDER) {
- table = alloc_pages_exact(size, GFP_ATOMIC);
- kmemleak_alloc(table, size, 1, GFP_ATOMIC);
+ table = alloc_pages_exact(size, gfp_flags);
+ kmemleak_alloc(table, size, 1, gfp_flags);
}
}
} while (!table && size > PAGE_SIZE && --log2qty);
@@ -7647,6 +7713,7 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
break;
if (pfn == end_pfn)
return;
+ offline_mem_sections(pfn, end_pfn);
zone = page_zone(pfn_to_page(pfn));
spin_lock_irqsave(&zone->lock, flags);
pfn = start_pfn;
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