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Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c142
1 files changed, 102 insertions, 40 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3a57d216fd60..2c4a4a2b1236 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -60,6 +60,7 @@
#include <linux/page_ext.h>
#include <linux/hugetlb.h>
#include <linux/sched/rt.h>
+#include <linux/locallock.h>
#include <linux/page_owner.h>
#include <asm/sections.h>
@@ -226,6 +227,18 @@ EXPORT_SYMBOL(nr_node_ids);
EXPORT_SYMBOL(nr_online_nodes);
#endif
+static DEFINE_LOCAL_IRQ_LOCK(pa_lock);
+
+#ifdef CONFIG_PREEMPT_RT_BASE
+# define cpu_lock_irqsave(cpu, flags) \
+ local_lock_irqsave_on(pa_lock, flags, cpu)
+# define cpu_unlock_irqrestore(cpu, flags) \
+ local_unlock_irqrestore_on(pa_lock, flags, cpu)
+#else
+# define cpu_lock_irqsave(cpu, flags) local_irq_save(flags)
+# define cpu_unlock_irqrestore(cpu, flags) local_irq_restore(flags)
+#endif
+
int page_group_by_mobility_disabled __read_mostly;
void set_pageblock_migratetype(struct page *page, int migratetype)
@@ -694,7 +707,7 @@ static inline int free_pages_check(struct page *page)
}
/*
- * Frees a number of pages from the PCP lists
+ * Frees a number of pages which have been collected from the pcp lists.
* Assumes all pages on list are in same zone, and of same order.
* count is the number of pages to free.
*
@@ -705,18 +718,51 @@ static inline int free_pages_check(struct page *page)
* pinned" detection logic.
*/
static void free_pcppages_bulk(struct zone *zone, int count,
- struct per_cpu_pages *pcp)
+ struct list_head *list)
{
- int migratetype = 0;
- int batch_free = 0;
int to_free = count;
unsigned long nr_scanned;
+ unsigned long flags;
+
+ spin_lock_irqsave(&zone->lock, flags);
- spin_lock(&zone->lock);
nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
if (nr_scanned)
__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
+ while (!list_empty(list)) {
+ struct page *page = list_first_entry(list, struct page, lru);
+ int mt; /* migratetype of the to-be-freed page */
+
+ /* must delete as __free_one_page list manipulates */
+ list_del(&page->lru);
+
+ mt = get_freepage_migratetype(page);
+ if (unlikely(has_isolate_pageblock(zone)))
+ mt = get_pageblock_migratetype(page);
+
+ /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
+ __free_one_page(page, page_to_pfn(page), zone, 0, mt);
+ trace_mm_page_pcpu_drain(page, 0, mt);
+ to_free--;
+ }
+ WARN_ON(to_free != 0);
+ spin_unlock_irqrestore(&zone->lock, flags);
+}
+
+/*
+ * Moves a number of pages from the PCP lists to free list which
+ * is freed outside of the locked region.
+ *
+ * Assumes all pages on list are in same zone, and of same order.
+ * count is the number of pages to free.
+ */
+static void isolate_pcp_pages(int to_free, struct per_cpu_pages *src,
+ struct list_head *dst)
+{
+ int migratetype = 0;
+ int batch_free = 0;
+
while (to_free) {
struct page *page;
struct list_head *list;
@@ -732,7 +778,7 @@ static void free_pcppages_bulk(struct zone *zone, int count,
batch_free++;
if (++migratetype == MIGRATE_PCPTYPES)
migratetype = 0;
- list = &pcp->lists[migratetype];
+ list = &src->lists[migratetype];
} while (list_empty(list));
/* This is the only non-empty list. Free them all. */
@@ -740,21 +786,11 @@ 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 */
+ page = list_last_entry(list, struct page, lru);
list_del(&page->lru);
- mt = get_freepage_migratetype(page);
- if (unlikely(has_isolate_pageblock(zone)))
- mt = get_pageblock_migratetype(page);
-
- /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */
- __free_one_page(page, page_to_pfn(page), zone, 0, mt);
- trace_mm_page_pcpu_drain(page, 0, mt);
+ list_add(&page->lru, dst);
} while (--to_free && --batch_free && !list_empty(list));
}
- spin_unlock(&zone->lock);
}
static void free_one_page(struct zone *zone,
@@ -763,7 +799,9 @@ static void free_one_page(struct zone *zone,
int migratetype)
{
unsigned long nr_scanned;
- spin_lock(&zone->lock);
+ unsigned long flags;
+
+ spin_lock_irqsave(&zone->lock, flags);
nr_scanned = zone_page_state(zone, NR_PAGES_SCANNED);
if (nr_scanned)
__mod_zone_page_state(zone, NR_PAGES_SCANNED, -nr_scanned);
@@ -773,7 +811,7 @@ static void free_one_page(struct zone *zone,
migratetype = get_pfnblock_migratetype(page, pfn);
}
__free_one_page(page, pfn, zone, order, migratetype);
- spin_unlock(&zone->lock);
+ spin_unlock_irqrestore(&zone->lock, flags);
}
static int free_tail_pages_check(struct page *head_page, struct page *page)
@@ -838,11 +876,11 @@ static void __free_pages_ok(struct page *page, unsigned int order)
return;
migratetype = get_pfnblock_migratetype(page, pfn);
- local_irq_save(flags);
+ local_lock_irqsave(pa_lock, 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);
+ local_unlock_irqrestore(pa_lock, flags);
}
void __init __free_pages_bootmem(struct page *page, unsigned long pfn,
@@ -1389,16 +1427,18 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp)
{
unsigned long flags;
+ LIST_HEAD(dst);
int to_drain, batch;
- local_irq_save(flags);
+ local_lock_irqsave(pa_lock, flags);
batch = READ_ONCE(pcp->batch);
to_drain = min(pcp->count, batch);
if (to_drain > 0) {
- free_pcppages_bulk(zone, to_drain, pcp);
+ isolate_pcp_pages(to_drain, pcp, &dst);
pcp->count -= to_drain;
}
- local_irq_restore(flags);
+ local_unlock_irqrestore(pa_lock, flags);
+ free_pcppages_bulk(zone, to_drain, &dst);
}
#endif
@@ -1414,16 +1454,21 @@ static void drain_pages_zone(unsigned int cpu, struct zone *zone)
unsigned long flags;
struct per_cpu_pageset *pset;
struct per_cpu_pages *pcp;
+ LIST_HEAD(dst);
+ int count;
- local_irq_save(flags);
+ cpu_lock_irqsave(cpu, flags);
pset = per_cpu_ptr(zone->pageset, cpu);
pcp = &pset->pcp;
- if (pcp->count) {
- free_pcppages_bulk(zone, pcp->count, pcp);
+ count = pcp->count;
+ if (count) {
+ isolate_pcp_pages(count, pcp, &dst);
pcp->count = 0;
}
- local_irq_restore(flags);
+ cpu_unlock_irqrestore(cpu, flags);
+ if (count)
+ free_pcppages_bulk(zone, count, &dst);
}
/*
@@ -1509,8 +1554,17 @@ void drain_all_pages(struct zone *zone)
else
cpumask_clear_cpu(cpu, &cpus_with_pcps);
}
+#ifndef CONFIG_PREEMPT_RT_BASE
on_each_cpu_mask(&cpus_with_pcps, (smp_call_func_t) drain_local_pages,
zone, 1);
+#else
+ for_each_cpu(cpu, &cpus_with_pcps) {
+ if (zone)
+ drain_pages_zone(cpu, zone);
+ else
+ drain_pages(cpu);
+ }
+#endif
}
#ifdef CONFIG_HIBERNATION
@@ -1566,7 +1620,7 @@ void free_hot_cold_page(struct page *page, bool cold)
migratetype = get_pfnblock_migratetype(page, pfn);
set_freepage_migratetype(page, migratetype);
- local_irq_save(flags);
+ local_lock_irqsave(pa_lock, flags);
__count_vm_event(PGFREE);
/*
@@ -1592,12 +1646,17 @@ void free_hot_cold_page(struct page *page, bool cold)
pcp->count++;
if (pcp->count >= pcp->high) {
unsigned long batch = READ_ONCE(pcp->batch);
- free_pcppages_bulk(zone, batch, pcp);
+ LIST_HEAD(dst);
+
+ isolate_pcp_pages(batch, pcp, &dst);
pcp->count -= batch;
+ local_unlock_irqrestore(pa_lock, flags);
+ free_pcppages_bulk(zone, batch, &dst);
+ return;
}
out:
- local_irq_restore(flags);
+ local_unlock_irqrestore(pa_lock, flags);
}
/*
@@ -1728,7 +1787,7 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
struct per_cpu_pages *pcp;
struct list_head *list;
- local_irq_save(flags);
+ local_lock_irqsave(pa_lock, flags);
pcp = &this_cpu_ptr(zone->pageset)->pcp;
list = &pcp->lists[migratetype];
if (list_empty(list)) {
@@ -1760,13 +1819,15 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
*/
WARN_ON_ONCE(order > 1);
}
- spin_lock_irqsave(&zone->lock, flags);
+ local_spin_lock_irqsave(pa_lock, &zone->lock, flags);
page = __rmqueue(zone, order, migratetype);
- spin_unlock(&zone->lock);
- if (!page)
+ if (!page) {
+ spin_unlock(&zone->lock);
goto failed;
+ }
__mod_zone_freepage_state(zone, -(1 << order),
get_freepage_migratetype(page));
+ spin_unlock(&zone->lock);
}
__mod_zone_page_state(zone, NR_ALLOC_BATCH, -(1 << order));
@@ -1776,13 +1837,13 @@ struct page *buffered_rmqueue(struct zone *preferred_zone,
__count_zone_vm_events(PGALLOC, zone, 1 << order);
zone_statistics(preferred_zone, zone, gfp_flags);
- local_irq_restore(flags);
+ local_unlock_irqrestore(pa_lock, flags);
VM_BUG_ON_PAGE(bad_range(zone, page), page);
return page;
failed:
- local_irq_restore(flags);
+ local_unlock_irqrestore(pa_lock, flags);
return NULL;
}
@@ -5673,6 +5734,7 @@ static int page_alloc_cpu_notify(struct notifier_block *self,
void __init page_alloc_init(void)
{
hotcpu_notifier(page_alloc_cpu_notify, 0);
+ local_irq_lock_init(pa_lock);
}
/*
@@ -6560,7 +6622,7 @@ void zone_pcp_reset(struct zone *zone)
struct per_cpu_pageset *pset;
/* avoid races with drain_pages() */
- local_irq_save(flags);
+ local_lock_irqsave(pa_lock, flags);
if (zone->pageset != &boot_pageset) {
for_each_online_cpu(cpu) {
pset = per_cpu_ptr(zone->pageset, cpu);
@@ -6569,7 +6631,7 @@ void zone_pcp_reset(struct zone *zone)
free_percpu(zone->pageset);
zone->pageset = &boot_pageset;
}
- local_irq_restore(flags);
+ local_unlock_irqrestore(pa_lock, flags);
}
#ifdef CONFIG_MEMORY_HOTREMOVE
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-24 03:58:30 +0000