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Date: Wed, 07 Nov 2012 01:10:02 +0530
From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To: akpm@...ux-foundation.org, mgorman@...e.de, mjg59@...f.ucam.org,
paulmck@...ux.vnet.ibm.com, dave@...ux.vnet.ibm.com,
maxime.coquelin@...ricsson.com, loic.pallardy@...ricsson.com,
arjan@...ux.intel.com, kmpark@...radead.org,
kamezawa.hiroyu@...fujitsu.com, lenb@...nel.org, rjw@...k.pl
Cc: gargankita@...il.com, amit.kachhap@...aro.org,
svaidy@...ux.vnet.ibm.com, thomas.abraham@...aro.org,
santosh.shilimkar@...com, srivatsa.bhat@...ux.vnet.ibm.com,
linux-pm@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org
Subject: [RFC PATCH 02/10] mm: Helper routines
From: Ankita Garg <gargankita@...il.com>
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 <gargankita@...il.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
include/linux/mm.h | 7 ++-----
include/linux/mmzone.h | 22 +++++++++++++++++++---
mm/mmzone.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
3 files changed, 65 insertions(+), 12 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index fa06804..70f1009 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -693,11 +693,6 @@ static inline int page_to_nid(const struct page *page)
}
#endif
-static inline struct zone *page_zone(const 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 void set_page_section(struct page *page, unsigned long section)
{
@@ -711,6 +706,8 @@ static inline unsigned long page_to_section(const struct page *page)
}
#endif
+struct zone *page_zone(struct page *page);
+
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 3f9b106..6f5d533 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -800,7 +800,7 @@ 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->region_zones)
static inline int populated_zone(struct zone *zone)
{
@@ -907,7 +907,9 @@ 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);
+extern struct mem_region *next_mem_region(struct mem_region *region);
/**
* for_each_online_pgdat - helper macro to iterate over all online nodes
@@ -917,6 +919,20 @@ extern struct zone *next_zone(struct zone *zone);
for (pgdat = first_online_pgdat(); \
pgdat; \
pgdat = next_online_pgdat(pgdat))
+
+
+/**
+ * for_each_mem_region_in_node - helper macro to iterate over all the memory
+ * regions in a node.
+ * @region - pointer to a struct mem_region variable
+ * @nid - node id of the node
+ */
+#define for_each_mem_region_in_node(region, nid) \
+ for (region = (NODE_DATA(nid))->node_regions; \
+ region; \
+ region = next_mem_region(region))
+
+
/**
* for_each_zone - helper macro to iterate over all memory zones
* @zone - pointer to struct zone variable
@@ -925,12 +941,12 @@ 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 3cef80f..d32d10a 100644
--- a/mm/mmzone.c
+++ b/mm/mmzone.c
@@ -23,22 +23,62 @@ struct pglist_data *next_online_pgdat(struct pglist_data *pgdat)
return NODE_DATA(nid);
}
+struct mem_region *next_mem_region(struct mem_region *region)
+{
+ int next_region = region->region + 1;
+ pg_data_t *pgdat = NODE_DATA(region->node);
+
+ if (next_region == pgdat->nr_node_regions)
+ return NULL;
+ return &(pgdat->node_regions[next_region]);
+}
+
+struct zone *first_zone(void)
+{
+ return (first_online_pgdat())->node_regions[0].region_zones;
+}
+
+struct zone *page_zone(struct page *page)
+{
+ pg_data_t *pgdat = NODE_DATA(page_to_nid(page));
+ unsigned long pfn = page_to_pfn(page);
+ struct mem_region *region;
+
+ for_each_mem_region_in_node(region, pgdat->node_id) {
+ unsigned long end_pfn = region->start_pfn +
+ region->spanned_pages;
+
+ if ((pfn >= region->start_pfn) && (pfn < end_pfn))
+ return ®ion->region_zones[page_zonenum(page)];
+ }
+
+ return NULL;
+}
+
+
/*
* next_zone - helper magic for for_each_zone()
*/
struct zone *next_zone(struct zone *zone)
{
pg_data_t *pgdat = zone->zone_pgdat;
+ struct mem_region *region = zone->zone_mem_region;
+
+ if (zone < region->region_zones + MAX_NR_ZONES - 1)
+ return ++zone;
- if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
- zone++;
- else {
+ region = next_mem_region(region);
+
+ if (region) {
+ zone = region->region_zones;
+ } else {
pgdat = next_online_pgdat(pgdat);
if (pgdat)
- zone = pgdat->node_zones;
+ zone = pgdat->node_regions[0].region_zones;
else
zone = NULL;
}
+
return zone;
}
--
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