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-rw-r--r--mm/page_alloc.c401
1 files changed, 250 insertions, 151 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 8deb9d0fd5b..d03c946d556 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -50,6 +50,7 @@
#include <linux/kmemleak.h>
#include <linux/memory.h>
#include <trace/events/kmem.h>
+#include <linux/ftrace_event.h>
#include <asm/tlbflush.h>
#include <asm/div64.h>
@@ -76,6 +77,31 @@ unsigned long totalreserve_pages __read_mostly;
int percpu_pagelist_fraction;
gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
+#ifdef CONFIG_PM_SLEEP
+/*
+ * The following functions are used by the suspend/hibernate code to temporarily
+ * change gfp_allowed_mask in order to avoid using I/O during memory allocations
+ * while devices are suspended. To avoid races with the suspend/hibernate code,
+ * they should always be called with pm_mutex held (gfp_allowed_mask also should
+ * only be modified with pm_mutex held, unless the suspend/hibernate code is
+ * guaranteed not to run in parallel with that modification).
+ */
+void set_gfp_allowed_mask(gfp_t mask)
+{
+ WARN_ON(!mutex_is_locked(&pm_mutex));
+ gfp_allowed_mask = mask;
+}
+
+gfp_t clear_gfp_allowed_mask(gfp_t mask)
+{
+ gfp_t ret = gfp_allowed_mask;
+
+ WARN_ON(!mutex_is_locked(&pm_mutex));
+ gfp_allowed_mask &= ~mask;
+ return ret;
+}
+#endif /* CONFIG_PM_SLEEP */
+
#ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE
int pageblock_order __read_mostly;
#endif
@@ -263,10 +289,7 @@ static void bad_page(struct page *page)
printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n",
current->comm, page_to_pfn(page));
- printk(KERN_ALERT
- "page:%p flags:%p count:%d mapcount:%d mapping:%p index:%lx\n",
- page, (void *)page->flags, page_count(page),
- page_mapcount(page), page->mapping, page->index);
+ dump_page(page);
dump_stack();
out:
@@ -530,7 +553,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
int batch_free = 0;
spin_lock(&zone->lock);
- zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE);
+ zone->all_unreclaimable = 0;
zone->pages_scanned = 0;
__mod_zone_page_state(zone, NR_FREE_PAGES, count);
@@ -568,7 +591,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
int migratetype)
{
spin_lock(&zone->lock);
- zone_clear_flag(zone, ZONE_ALL_UNRECLAIMABLE);
+ zone->all_unreclaimable = 0;
zone->pages_scanned = 0;
__mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
@@ -583,6 +606,7 @@ static void __free_pages_ok(struct page *page, unsigned int order)
int bad = 0;
int wasMlocked = __TestClearPageMlocked(page);
+ trace_mm_page_free_direct(page, order);
kmemcheck_free_shadow(page, order);
for (i = 0 ; i < (1 << order) ; ++i)
@@ -1009,10 +1033,10 @@ static void drain_pages(unsigned int cpu)
struct per_cpu_pageset *pset;
struct per_cpu_pages *pcp;
- pset = zone_pcp(zone, cpu);
+ local_irq_save(flags);
+ pset = per_cpu_ptr(zone->pageset, cpu);
pcp = &pset->pcp;
- local_irq_save(flags);
free_pcppages_bulk(zone, pcp->count, pcp);
pcp->count = 0;
local_irq_restore(flags);
@@ -1073,8 +1097,9 @@ void mark_free_pages(struct zone *zone)
/*
* Free a 0-order page
+ * cold == 1 ? free a cold page : free a hot page
*/
-static void free_hot_cold_page(struct page *page, int cold)
+void free_hot_cold_page(struct page *page, int cold)
{
struct zone *zone = page_zone(page);
struct per_cpu_pages *pcp;
@@ -1082,6 +1107,7 @@ static void free_hot_cold_page(struct page *page, int cold)
int migratetype;
int wasMlocked = __TestClearPageMlocked(page);
+ trace_mm_page_free_direct(page, 0);
kmemcheck_free_shadow(page, 0);
if (PageAnon(page))
@@ -1096,7 +1122,6 @@ static void free_hot_cold_page(struct page *page, int cold)
arch_free_page(page, 0);
kernel_map_pages(page, 1, 0);
- pcp = &zone_pcp(zone, get_cpu())->pcp;
migratetype = get_pageblock_migratetype(page);
set_page_private(page, migratetype);
local_irq_save(flags);
@@ -1119,6 +1144,7 @@ static void free_hot_cold_page(struct page *page, int cold)
migratetype = MIGRATE_MOVABLE;
}
+ pcp = &this_cpu_ptr(zone->pageset)->pcp;
if (cold)
list_add_tail(&page->lru, &pcp->lists[migratetype]);
else
@@ -1131,15 +1157,8 @@ static void free_hot_cold_page(struct page *page, int cold)
out:
local_irq_restore(flags);
- put_cpu();
}
-void free_hot_page(struct page *page)
-{
- trace_mm_page_free_direct(page, 0);
- free_hot_cold_page(page, 0);
-}
-
/*
* split_page takes a non-compound higher-order page, and splits it into
* n (1<<order) sub-pages: page[0..n]
@@ -1181,17 +1200,15 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
unsigned long flags;
struct page *page;
int cold = !!(gfp_flags & __GFP_COLD);
- int cpu;
again:
- cpu = get_cpu();
if (likely(order == 0)) {
struct per_cpu_pages *pcp;
struct list_head *list;
- pcp = &zone_pcp(zone, cpu)->pcp;
- list = &pcp->lists[migratetype];
local_irq_save(flags);
+ pcp = &this_cpu_ptr(zone->pageset)->pcp;
+ list = &pcp->lists[migratetype];
if (list_empty(list)) {
pcp->count += rmqueue_bulk(zone, 0,
pcp->batch, list,
@@ -1232,7 +1249,6 @@ again:
__count_zone_vm_events(PGALLOC, zone, 1 << order);
zone_statistics(preferred_zone, zone);
local_irq_restore(flags);
- put_cpu();
VM_BUG_ON(bad_range(zone, page));
if (prep_new_page(page, order, gfp_flags))
@@ -1241,7 +1257,6 @@ again:
failed:
local_irq_restore(flags);
- put_cpu();
return NULL;
}
@@ -2013,9 +2028,8 @@ void __pagevec_free(struct pagevec *pvec)
void __free_pages(struct page *page, unsigned int order)
{
if (put_page_testzero(page)) {
- trace_mm_page_free_direct(page, order);
if (order == 0)
- free_hot_page(page);
+ free_hot_cold_page(page, 0);
else
__free_pages_ok(page, order);
}
@@ -2180,7 +2194,7 @@ void show_free_areas(void)
for_each_online_cpu(cpu) {
struct per_cpu_pageset *pageset;
- pageset = zone_pcp(zone, cpu);
+ pageset = per_cpu_ptr(zone->pageset, cpu);
printk("CPU %4d: hi:%5d, btch:%4d usd:%4d\n",
cpu, pageset->pcp.high,
@@ -2271,7 +2285,7 @@ void show_free_areas(void)
K(zone_page_state(zone, NR_BOUNCE)),
K(zone_page_state(zone, NR_WRITEBACK_TEMP)),
zone->pages_scanned,
- (zone_is_all_unreclaimable(zone) ? "yes" : "no")
+ (zone->all_unreclaimable ? "yes" : "no")
);
printk("lowmem_reserve[]:");
for (i = 0; i < MAX_NR_ZONES; i++)
@@ -2745,10 +2759,29 @@ static void build_zonelist_cache(pg_data_t *pgdat)
#endif /* CONFIG_NUMA */
+/*
+ * Boot pageset table. One per cpu which is going to be used for all
+ * zones and all nodes. The parameters will be set in such a way
+ * that an item put on a list will immediately be handed over to
+ * the buddy list. This is safe since pageset manipulation is done
+ * with interrupts disabled.
+ *
+ * The boot_pagesets must be kept even after bootup is complete for
+ * unused processors and/or zones. They do play a role for bootstrapping
+ * hotplugged processors.
+ *
+ * zoneinfo_show() and maybe other functions do
+ * not check if the processor is online before following the pageset pointer.
+ * Other parts of the kernel may not check if the zone is available.
+ */
+static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
+static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
+
/* return values int ....just for stop_machine() */
static int __build_all_zonelists(void *dummy)
{
int nid;
+ int cpu;
#ifdef CONFIG_NUMA
memset(node_load, 0, sizeof(node_load));
@@ -2759,6 +2792,23 @@ static int __build_all_zonelists(void *dummy)
build_zonelists(pgdat);
build_zonelist_cache(pgdat);
}
+
+ /*
+ * Initialize the boot_pagesets that are going to be used
+ * for bootstrapping processors. The real pagesets for
+ * each zone will be allocated later when the per cpu
+ * allocator is available.
+ *
+ * boot_pagesets are used also for bootstrapping offline
+ * cpus if the system is already booted because the pagesets
+ * are needed to initialize allocators on a specific cpu too.
+ * F.e. the percpu allocator needs the page allocator which
+ * needs the percpu allocator in order to allocate its pagesets
+ * (a chicken-egg dilemma).
+ */
+ for_each_possible_cpu(cpu)
+ setup_pageset(&per_cpu(boot_pageset, cpu), 0);
+
return 0;
}
@@ -3096,121 +3146,33 @@ static void setup_pagelist_highmark(struct per_cpu_pageset *p,
pcp->batch = PAGE_SHIFT * 8;
}
-
-#ifdef CONFIG_NUMA
-/*
- * Boot pageset table. One per cpu which is going to be used for all
- * zones and all nodes. The parameters will be set in such a way
- * that an item put on a list will immediately be handed over to
- * the buddy list. This is safe since pageset manipulation is done
- * with interrupts disabled.
- *
- * Some NUMA counter updates may also be caught by the boot pagesets.
- *
- * The boot_pagesets must be kept even after bootup is complete for
- * unused processors and/or zones. They do play a role for bootstrapping
- * hotplugged processors.
- *
- * zoneinfo_show() and maybe other functions do
- * not check if the processor is online before following the pageset pointer.
- * Other parts of the kernel may not check if the zone is available.
- */
-static struct per_cpu_pageset boot_pageset[NR_CPUS];
-
/*
- * Dynamically allocate memory for the
- * per cpu pageset array in struct zone.
+ * Allocate per cpu pagesets and initialize them.
+ * Before this call only boot pagesets were available.
+ * Boot pagesets will no longer be used by this processorr
+ * after setup_per_cpu_pageset().
*/
-static int __cpuinit process_zones(int cpu)
+void __init setup_per_cpu_pageset(void)
{
- struct zone *zone, *dzone;
- int node = cpu_to_node(cpu);
-
- node_set_state(node, N_CPU); /* this node has a cpu */
+ struct zone *zone;
+ int cpu;
for_each_populated_zone(zone) {
- zone_pcp(zone, cpu) = kmalloc_node(sizeof(struct per_cpu_pageset),
- GFP_KERNEL, node);
- if (!zone_pcp(zone, cpu))
- goto bad;
+ zone->pageset = alloc_percpu(struct per_cpu_pageset);
- setup_pageset(zone_pcp(zone, cpu), zone_batchsize(zone));
+ for_each_possible_cpu(cpu) {
+ struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu);
- if (percpu_pagelist_fraction)
- setup_pagelist_highmark(zone_pcp(zone, cpu),
- (zone->present_pages / percpu_pagelist_fraction));
- }
+ setup_pageset(pcp, zone_batchsize(zone));
- return 0;
-bad:
- for_each_zone(dzone) {
- if (!populated_zone(dzone))
- continue;
- if (dzone == zone)
- break;
- kfree(zone_pcp(dzone, cpu));
- zone_pcp(dzone, cpu) = &boot_pageset[cpu];
- }
- return -ENOMEM;
-}
-
-static inline void free_zone_pagesets(int cpu)
-{
- struct zone *zone;
-
- for_each_zone(zone) {
- struct per_cpu_pageset *pset = zone_pcp(zone, cpu);
-
- /* Free per_cpu_pageset if it is slab allocated */
- if (pset != &boot_pageset[cpu])
- kfree(pset);
- zone_pcp(zone, cpu) = &boot_pageset[cpu];
- }
-}
-
-static int __cpuinit pageset_cpuup_callback(struct notifier_block *nfb,
- unsigned long action,
- void *hcpu)
-{
- int cpu = (long)hcpu;
- int ret = NOTIFY_OK;
-
- switch (action) {
- case CPU_UP_PREPARE:
- case CPU_UP_PREPARE_FROZEN:
- if (process_zones(cpu))
- ret = NOTIFY_BAD;
- break;
- case CPU_UP_CANCELED:
- case CPU_UP_CANCELED_FROZEN:
- case CPU_DEAD:
- case CPU_DEAD_FROZEN:
- free_zone_pagesets(cpu);
- break;
- default:
- break;
+ if (percpu_pagelist_fraction)
+ setup_pagelist_highmark(pcp,
+ (zone->present_pages /
+ percpu_pagelist_fraction));
+ }
}
- return ret;
}
-static struct notifier_block __cpuinitdata pageset_notifier =
- { &pageset_cpuup_callback, NULL, 0 };
-
-void __init setup_per_cpu_pageset(void)
-{
- int err;
-
- /* Initialize per_cpu_pageset for cpu 0.
- * A cpuup callback will do this for every cpu
- * as it comes online
- */
- err = process_zones(smp_processor_id());
- BUG_ON(err);
- register_cpu_notifier(&pageset_notifier);
-}
-
-#endif
-
static noinline __init_refok
int zone_wait_table_init(struct zone *zone, unsigned long zone_size_pages)
{
@@ -3260,11 +3222,11 @@ static int __zone_pcp_update(void *data)
int cpu;
unsigned long batch = zone_batchsize(zone), flags;
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
+ for_each_possible_cpu(cpu) {
struct per_cpu_pageset *pset;
struct per_cpu_pages *pcp;
- pset = zone_pcp(zone, cpu);
+ pset = per_cpu_ptr(zone->pageset, cpu);
pcp = &pset->pcp;
local_irq_save(flags);
@@ -3282,21 +3244,17 @@ void zone_pcp_update(struct zone *zone)
static __meminit void zone_pcp_init(struct zone *zone)
{
- int cpu;
- unsigned long batch = zone_batchsize(zone);
+ /*
+ * per cpu subsystem is not up at this point. The following code
+ * relies on the ability of the linker to provide the
+ * offset of a (static) per cpu variable into the per cpu area.
+ */
+ zone->pageset = &boot_pageset;
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
-#ifdef CONFIG_NUMA
- /* Early boot. Slab allocator not functional yet */
- zone_pcp(zone, cpu) = &boot_pageset[cpu];
- setup_pageset(&boot_pageset[cpu],0);
-#else
- setup_pageset(zone_pcp(zone,cpu), batch);
-#endif
- }
if (zone->present_pages)
- printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n",
- zone->name, zone->present_pages, batch);
+ printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%u\n",
+ zone->name, zone->present_pages,
+ zone_batchsize(zone));
}
__meminit int init_currently_empty_zone(struct zone *zone,
@@ -3435,6 +3393,61 @@ void __init free_bootmem_with_active_regions(int nid,
}
}
+int __init add_from_early_node_map(struct range *range, int az,
+ int nr_range, int nid)
+{
+ int i;
+ u64 start, end;
+
+ /* need to go over early_node_map to find out good range for node */
+ for_each_active_range_index_in_nid(i, nid) {
+ start = early_node_map[i].start_pfn;
+ end = early_node_map[i].end_pfn;
+ nr_range = add_range(range, az, nr_range, start, end);
+ }
+ return nr_range;
+}
+
+#ifdef CONFIG_NO_BOOTMEM
+void * __init __alloc_memory_core_early(int nid, u64 size, u64 align,
+ u64 goal, u64 limit)
+{
+ int i;
+ void *ptr;
+
+ /* need to go over early_node_map to find out good range for node */
+ for_each_active_range_index_in_nid(i, nid) {
+ u64 addr;
+ u64 ei_start, ei_last;
+
+ ei_last = early_node_map[i].end_pfn;
+ ei_last <<= PAGE_SHIFT;
+ ei_start = early_node_map[i].start_pfn;
+ ei_start <<= PAGE_SHIFT;
+ addr = find_early_area(ei_start, ei_last,
+ goal, limit, size, align);
+
+ if (addr == -1ULL)
+ continue;
+
+#if 0
+ printk(KERN_DEBUG "alloc (nid=%d %llx - %llx) (%llx - %llx) %llx %llx => %llx\n",
+ nid,
+ ei_start, ei_last, goal, limit, size,
+ align, addr);
+#endif
+
+ ptr = phys_to_virt(addr);
+ memset(ptr, 0, size);
+ reserve_early_without_check(addr, addr + size, "BOOTMEM");
+ return ptr;
+ }
+
+ return NULL;
+}
+#endif
+
+
void __init work_with_active_regions(int nid, work_fn_t work_fn, void *data)
{
int i;
@@ -4377,8 +4390,12 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn)
for (i = 0; i < MAX_NR_ZONES; i++) {
if (i == ZONE_MOVABLE)
continue;
- printk(" %-8s %0#10lx -> %0#10lx\n",
- zone_names[i],
+ printk(" %-8s ", zone_names[i]);
+ if (arch_zone_lowest_possible_pfn[i] ==
+ arch_zone_highest_possible_pfn[i])
+ printk("empty\n");
+ else
+ printk("%0#10lx -> %0#10lx\n",
arch_zone_lowest_possible_pfn[i],
arch_zone_highest_possible_pfn[i]);
}
@@ -4467,7 +4484,11 @@ void __init set_dma_reserve(unsigned long new_dma_reserve)
}
#ifndef CONFIG_NEED_MULTIPLE_NODES
-struct pglist_data __refdata contig_page_data = { .bdata = &bootmem_node_data[0] };
+struct pglist_data __refdata contig_page_data = {
+#ifndef CONFIG_NO_BOOTMEM
+ .bdata = &bootmem_node_data[0]
+#endif
+ };
EXPORT_SYMBOL(contig_page_data);
#endif
@@ -4810,10 +4831,11 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write,
if (!write || (ret == -EINVAL))
return ret;
for_each_populated_zone(zone) {
- for_each_online_cpu(cpu) {
+ for_each_possible_cpu(cpu) {
unsigned long high;
high = zone->present_pages / percpu_pagelist_fraction;
- setup_pagelist_highmark(zone_pcp(zone, cpu), high);
+ setup_pagelist_highmark(
+ per_cpu_ptr(zone->pageset, cpu), high);
}
}
return 0;
@@ -5159,3 +5181,80 @@ bool is_free_buddy_page(struct page *page)
return order < MAX_ORDER;
}
#endif
+
+static struct trace_print_flags pageflag_names[] = {
+ {1UL << PG_locked, "locked" },
+ {1UL << PG_error, "error" },
+ {1UL << PG_referenced, "referenced" },
+ {1UL << PG_uptodate, "uptodate" },
+ {1UL << PG_dirty, "dirty" },
+ {1UL << PG_lru, "lru" },
+ {1UL << PG_active, "active" },
+ {1UL << PG_slab, "slab" },
+ {1UL << PG_owner_priv_1, "owner_priv_1" },
+ {1UL << PG_arch_1, "arch_1" },
+ {1UL << PG_reserved, "reserved" },
+ {1UL << PG_private, "private" },
+ {1UL << PG_private_2, "private_2" },
+ {1UL << PG_writeback, "writeback" },
+#ifdef CONFIG_PAGEFLAGS_EXTENDED
+ {1UL << PG_head, "head" },
+ {1UL << PG_tail, "tail" },
+#else
+ {1UL << PG_compound, "compound" },
+#endif
+ {1UL << PG_swapcache, "swapcache" },
+ {1UL << PG_mappedtodisk, "mappedtodisk" },
+ {1UL << PG_reclaim, "reclaim" },
+ {1UL << PG_buddy, "buddy" },
+ {1UL << PG_swapbacked, "swapbacked" },
+ {1UL << PG_unevictable, "unevictable" },
+#ifdef CONFIG_MMU
+ {1UL << PG_mlocked, "mlocked" },
+#endif
+#ifdef CONFIG_ARCH_USES_PG_UNCACHED
+ {1UL << PG_uncached, "uncached" },
+#endif
+#ifdef CONFIG_MEMORY_FAILURE
+ {1UL << PG_hwpoison, "hwpoison" },
+#endif
+ {-1UL, NULL },
+};
+
+static void dump_page_flags(unsigned long flags)
+{
+ const char *delim = "";
+ unsigned long mask;
+ int i;
+
+ printk(KERN_ALERT "page flags: %#lx(", flags);
+
+ /* remove zone id */
+ flags &= (1UL << NR_PAGEFLAGS) - 1;
+
+ for (i = 0; pageflag_names[i].name && flags; i++) {
+
+ mask = pageflag_names[i].mask;
+ if ((flags & mask) != mask)
+ continue;
+
+ flags &= ~mask;
+ printk("%s%s", delim, pageflag_names[i].name);
+ delim = "|";
+ }
+
+ /* check for left over flags */
+ if (flags)
+ printk("%s%#lx", delim, flags);
+
+ printk(")\n");
+}
+
+void dump_page(struct page *page)
+{
+ printk(KERN_ALERT
+ "page:%p count:%d mapcount:%d mapping:%p index:%#lx\n",
+ page, page_count(page), page_mapcount(page),
+ page->mapping, page->index);
+ dump_page_flags(page->flags);
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-18 08:41:46 +0000