Initialize the node's memory regions structures with the information about
the region-boundaries, at boot time.
Based-on-patch-by: Ankita Garg <gargankita@xxxxxxxxx>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
---
include/linux/mm.h | 4 ++++
mm/page_alloc.c | 35 +++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fa06804..19c4fb0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -657,6 +657,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
#define SECTIONS_MASK ((1UL << SECTIONS_WIDTH) - 1)
#define ZONEID_MASK ((1UL << ZONEID_SHIFT) - 1)
+/* Hard-code memory regions 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 bb90971..709e3c1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4560,6 +4560,40 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
#endif /* CONFIG_FLAT_NODE_MEM_MAP */
}
+void 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;
+ unsigned long i, absent;
+ int idx;
+ struct node_mem_region *region;
+
+ for (i = start_pfn, idx = 0; i < end_pfn;
+ i += region->spanned_pages, idx++) {
+
+ region = &pgdat->node_regions[idx];
+
+ if (i + MEM_REGION_SIZE <= end_pfn) {
+ region->start_pfn = i;
+ region->spanned_pages = MEM_REGION_SIZE;
+ } else {
+ region->start_pfn = i;
+ region->spanned_pages = end_pfn - i;
+ }
+
+ absent = __absent_pages_in_range(nid, region->start_pfn,
+ region->start_pfn +
+ region->spanned_pages);
+
+ region->present_pages = region->spanned_pages - absent;
+ region->idx = idx;
+ region->node = nid;
+ region->pgdat = pgdat;
+ pgdat->nr_node_regions++;
+ }
+}
+
void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
unsigned long node_start_pfn, unsigned long *zholes_size)
{
@@ -4581,6 +4615,7 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
#endif
free_area_init_core(pgdat, zones_size, zholes_size);
+ init_node_memory_regions(pgdat);
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
--
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