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Date: Fri, 27 May 2011 18:01:30 +0530
From: Ankita Garg <ankita@...ibm.com>
To: linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org
Cc: ankita@...ibm.com, svaidy@...ux.vnet.ibm.com,
thomas.abraham@...aro.org
Subject: [PATCH 02/10] mm: Helper routines
With the introduction of regions, helper routines are needed to walk through
all the regions and zones inside a node. This patch adds these helper
routines.
Signed-off-by: Ankita Garg <ankita@...ibm.com>
---
include/linux/mm.h | 21 ++++++++++++++++-----
include/linux/mmzone.h | 25 ++++++++++++++++++++++---
mm/mmzone.c | 36 +++++++++++++++++++++++++++++++-----
mm/page_alloc.c | 10 ++++++++++
4 files changed, 79 insertions(+), 13 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 6507dde..25299a3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -675,11 +675,6 @@ static inline int page_to_nid(struct page *page)
}
#endif
-static inline struct zone *page_zone(struct page *page)
-{
- return &NODE_DATA(page_to_nid(page))->node_zones[page_zonenum(page)];
-}
-
#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
static inline unsigned long page_to_section(struct page *page)
{
@@ -687,6 +682,22 @@ static inline unsigned long page_to_section(struct page *page)
}
#endif
+static inline struct zone *page_zone(struct page *page)
+{
+ pg_data_t *pg = NODE_DATA(page_to_nid(page));
+ int i;
+ unsigned long pfn = page_to_pfn(page);
+
+ for (i = 0; i< pg->nr_mem_regions; i++) {
+ mem_region_t *mem_region= &(pg->mem_regions[i]);
+ unsigned long end_pfn = mem_region->start_pfn + mem_region->spanned_pages - 1;
+ if ((pfn >= mem_region->start_pfn) && (pfn <= end_pfn))
+ return &mem_region->zones[page_zonenum(page)];
+ }
+
+ return NULL;
+}
+
static inline void set_page_zone(struct page *page, enum zone_type zone)
{
page->flags &= ~(ZONES_MASK << ZONES_PGSHIFT);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 997a474..3f13dc8 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -711,7 +711,7 @@ unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
/*
* zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc.
*/
-#define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones)
+#define zone_idx(zone) ((zone) - (zone)->zone_mem_region->zones)
static inline int populated_zone(struct zone *zone)
{
@@ -818,6 +818,7 @@ extern struct pglist_data contig_page_data;
extern struct pglist_data *first_online_pgdat(void);
extern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat);
+extern struct zone* first_zone(void);
extern struct zone *next_zone(struct zone *zone);
/**
@@ -828,6 +829,24 @@ extern struct zone *next_zone(struct zone *zone);
for (pgdat = first_online_pgdat(); \
pgdat; \
pgdat = next_online_pgdat(pgdat))
+
+extern struct mem_region_list_data *first_mem_region(struct pglist_data *pgdat);
+/**
+ * for_each_mem_region - helper macro to iterate over all the memory regions in a
+ * node
+ * @mem_region - pointer to a mem_region_t variable
+ */
+#define for_each_online_mem_region(mem_region) \
+ for (mem_region = first_node_mem_region(); \
+ mem_region; \
+ mem_region = next_mem_region(mem_region))
+
+inline int first_mem_region_in_nid(int nid);
+int next_mem_region_in_nid(int idx, int nid);
+/* Basic iterator support to walk all the memory regions in a node */
+#define for_each_mem_region_in_nid(i, nid) \
+ for (i = 0; i != -1; i = next_mem_region_in_nid(i, nid))
+
/**
* for_each_zone - helper macro to iterate over all memory zones
* @zone - pointer to struct zone variable
@@ -836,12 +855,12 @@ extern struct zone *next_zone(struct zone *zone);
* fills it in.
*/
#define for_each_zone(zone) \
- for (zone = (first_online_pgdat())->node_zones; \
+ for (zone = (first_zone()); \
zone; \
zone = next_zone(zone))
#define for_each_populated_zone(zone) \
- for (zone = (first_online_pgdat())->node_zones; \
+ for (zone = (first_zone()); \
zone; \
zone = next_zone(zone)) \
if (!populated_zone(zone)) \
diff --git a/mm/mmzone.c b/mm/mmzone.c
index f5b7d17..0e2bec3 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -24,21 +24,47 @@ struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
return NODE_DATA(nid);
}
+inline struct mem_region_list_data *first_mem_region(struct pglist_data *pgdat)
+{
+ return &pgdat->mem_regions[0];
+}
+
+struct mem_region_list_data *next_mem_region(struct mem_region_list_data *mem_region)
+{
+ int next_region = mem_region->region + 1;
+ pg_data_t *pgdat = NODE_DATA(mem_region->node);
+
+ if (next_region == pgdat->nr_mem_regions)
+ return NULL;
+ return &(pgdat->mem_regions[next_region]);
+}
+
+inline struct zone *first_zone(void)
+{
+ return (first_online_pgdat())->mem_regions[0].zones;
+}
+
/*
* next_zone - helper magic for for_each_zone()
*/
struct zone *next_zone(struct zone *zone)
{
pg_data_t *pgdat = zone->zone_pgdat;
+ mem_region_t *mem_region = zone->zone_mem_region;
- if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
+ if (zone < mem_region->zones + MAX_NR_ZONES - 1)
zone++;
else {
- pgdat = next_online_pgdat(pgdat);
- if (pgdat)
- zone = pgdat->node_zones;
+ mem_region = next_mem_region(mem_region);
+ if (!mem_region) {
+ pgdat = next_online_pgdat(pgdat);
+ if (pgdat)
+ zone = pgdat->mem_regions[0].zones;
+ else
+ zone = NULL;
+ }
else
- zone = NULL;
+ zone = mem_region->zones;
}
return zone;
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3f8bce2..af2529d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2492,6 +2492,16 @@ out:
#define K(x) ((x) << (PAGE_SHIFT-10))
+int next_mem_region_in_nid(int idx, int nid)
+{
+ pg_data_t *pgdat = NODE_DATA(nid);
+ int region = idx + 1;
+
+ if (region == pgdat->nr_mem_regions)
+ return -1;
+ return region;
+}
+
/*
* Show free area list (used inside shift_scroll-lock stuff)
* We also calculate the percentage fragmentation. We do this by counting the
--
1.7.4
--
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