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Subject[PATCH 07/13] mm: meminit: Only a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set
Date
This patch initalises all low memory struct pages and 2G of the highest zone
on each node during memory initialisation if CONFIG_DEFERRED_STRUCT_PAGE_INIT
is set. That config option cannot be set but will be available in a later
patch. Parallel initialisation of struct page depends on some features
from memory hotplug and it is necessary to alter alter section annotations.

Signed-off-by: Mel Gorman <mgorman@suse.de>
---
include/linux/mmzone.h | 8 +++++
mm/internal.h | 8 +++++
mm/page_alloc.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++--
3 files changed, 94 insertions(+), 3 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index f78ca65a9884..821f5000dec9 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -762,6 +762,14 @@ typedef struct pglist_data {
/* Number of pages migrated during the rate limiting time interval */
unsigned long numabalancing_migrate_nr_pages;
#endif
+
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+ /*
+ * If memory initialisation on large machines is deferred then this
+ * is the first PFN that needs to be initialised.
+ */
+ unsigned long first_deferred_pfn;
+#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */
} pg_data_t;

#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)
diff --git a/mm/internal.h b/mm/internal.h
index 76b605139c7a..4a73f74846bd 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -385,6 +385,14 @@ static inline void mminit_verify_zonelist(void)
}
#endif /* CONFIG_DEBUG_MEMORY_INIT */

+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+#define __defermem_init __meminit
+#define __defer_init __meminit
+#else
+#define __defermem_init
+#define __defer_init __init
+#endif
+
/* mminit_validate_memmodel_limits is independent of CONFIG_DEBUG_MEMORY_INIT */
#if defined(CONFIG_SPARSEMEM)
extern void mminit_validate_memmodel_limits(unsigned long *start_pfn,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b148c9921740..2d649e0a1f9e 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -235,6 +235,67 @@ EXPORT_SYMBOL(nr_online_nodes);

int page_group_by_mobility_disabled __read_mostly;

+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+static inline void reset_deferred_meminit(pg_data_t *pgdat)
+{
+ pgdat->first_deferred_pfn = ULONG_MAX;
+}
+
+/* Returns true if the struct page for the pfn is uninitialised */
+static inline bool __defermem_init early_page_uninitialised(unsigned long pfn)
+{
+ int nid = early_pfn_to_nid(pfn);
+
+ if (pfn >= NODE_DATA(nid)->first_deferred_pfn)
+ return true;
+
+ return false;
+}
+
+/*
+ * Returns false when the remaining initialisation should be deferred until
+ * later in the boot cycle when it can be parallelised.
+ */
+static inline bool update_defer_init(pg_data_t *pgdat,
+ unsigned long pfn, unsigned long zone_end,
+ unsigned long *nr_initialised)
+{
+ if (!deferred_mem_init_enabled)
+ return true;
+
+ /* Always populate low zones for address-contrained allocations */
+ if (zone_end < pgdat_end_pfn(pgdat))
+ return true;
+
+ /* Initialise at least 2G of the highest zone */
+ (*nr_initialised)++;
+ if (*nr_initialised > (2UL << (30 - PAGE_SHIFT)) &&
+ (pfn & (PAGES_PER_SECTION - 1)) == 0) {
+ pgdat->first_deferred_pfn = pfn;
+ return false;
+ }
+
+ return true;
+}
+#else
+static inline void reset_deferred_meminit(pg_data_t *pgdat)
+{
+}
+
+static inline bool early_page_uninitialised(unsigned long pfn)
+{
+ return false;
+}
+
+static inline bool update_defer_init(pg_data_t *pgdat,
+ unsigned long pfn, unsigned long zone_end,
+ unsigned long *nr_initialised)
+{
+ return true;
+}
+#endif
+
+
void set_pageblock_migratetype(struct page *page, int migratetype)
{
if (unlikely(page_group_by_mobility_disabled &&
@@ -886,8 +947,8 @@ static void __free_pages_ok(struct page *page, unsigned int order)
local_irq_restore(flags);
}

-void __init __free_pages_bootmem(struct page *page, unsigned long pfn,
- unsigned int order)
+static void __defer_init __free_pages_boot_core(struct page *page,
+ unsigned long pfn, unsigned int order)
{
unsigned int nr_pages = 1 << order;
struct page *p = page;
@@ -950,6 +1011,14 @@ static inline bool __meminit early_pfn_in_nid(unsigned long pfn, int node)
}
#endif

+void __defer_init __free_pages_bootmem(struct page *page, unsigned long pfn,
+ unsigned int order)
+{
+ if (early_page_uninitialised(pfn))
+ return;
+ return __free_pages_boot_core(page, pfn, order);
+}
+
#ifdef CONFIG_CMA
/* Free whole pageblock and set its migration type to MIGRATE_CMA. */
void __init init_cma_reserved_pageblock(struct page *page)
@@ -4222,14 +4291,16 @@ static void setup_zone_migrate_reserve(struct zone *zone)
void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
unsigned long start_pfn, enum memmap_context context)
{
+ pg_data_t *pgdat = NODE_DATA(nid);
unsigned long end_pfn = start_pfn + size;
unsigned long pfn;
struct zone *z;
+ unsigned long nr_initialised = 0;

if (highest_memmap_pfn < end_pfn - 1)
highest_memmap_pfn = end_pfn - 1;

- z = &NODE_DATA(nid)->node_zones[zone];
+ z = &pgdat->node_zones[zone];
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
/*
* There can be holes in boot-time mem_map[]s
@@ -4241,6 +4312,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
continue;
if (!early_pfn_in_nid(pfn, nid))
continue;
+ if (!update_defer_init(pgdat, pfn, end_pfn,
+ &nr_initialised))
+ break;
}
__init_single_pfn(pfn, zone, nid);
}
@@ -5042,6 +5116,7 @@ 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->classzone_idx);

+ reset_deferred_meminit(pgdat);
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
--
2.1.2


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