[RFC PATCH v4 02/40] mm: Initialize node memory regions during boot
From: Srivatsa S. Bhat <hidden>
Date: 2013-09-25 23:18:19
Also in:
linux-mm, lkml
Subsystem:
memory management, memory management - core, memory management - page allocator, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Vlastimil Babka, Linus Torvalds
Initialize the node's memory-regions structures with the information about the region-boundaries, at boot time. Based-on-patch-by: Ankita Garg [off-list ref] Signed-off-by: Srivatsa S. Bhat <redacted> --- include/linux/mm.h | 4 ++++ mm/page_alloc.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 8b6e55e..223be46 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h@@ -620,6 +620,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma) #define LAST_NID_MASK ((1UL << LAST_NID_WIDTH) - 1) #define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1) +/* Hard-code memory region size to be 512 MB for now. */ +#define MEM_REGION_SHIFT (29 - PAGE_SHIFT) +#define MEM_REGION_SIZE (1UL << MEM_REGION_SHIFT) + static inline enum zone_type page_zonenum(const struct page *page) { return (page->flags >> ZONES_PGSHIFT) & ZONES_MASK;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 0ee638f..26835c4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c@@ -4858,6 +4858,33 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) #endif /* CONFIG_FLAT_NODE_MEM_MAP */ } +static void __meminit init_node_memory_regions(struct pglist_data *pgdat) +{ + int nid = pgdat->node_id; + unsigned long start_pfn = pgdat->node_start_pfn; + unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; + struct node_mem_region *region; + unsigned long i, absent; + int idx; + + for (i = start_pfn, idx = 0; i < end_pfn; + i += region->spanned_pages, idx++) { + + region = &pgdat->node_regions[idx]; + region->pgdat = pgdat; + region->start_pfn = i; + region->spanned_pages = min(MEM_REGION_SIZE, end_pfn - i); + region->end_pfn = region->start_pfn + region->spanned_pages; + + absent = __absent_pages_in_range(nid, region->start_pfn, + region->end_pfn); + + region->present_pages = region->spanned_pages - absent; + } + + pgdat->nr_node_regions = idx; +} + void __paginginit free_area_init_node(int nid, unsigned long *zones_size, unsigned long node_start_pfn, unsigned long *zholes_size) {
@@ -4886,6 +4913,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, free_area_init_core(pgdat, start_pfn, end_pfn, zones_size, zholes_size); + init_node_memory_regions(pgdat); } #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP --
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