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Date: Wed, 07 Nov 2012 01:10:45 +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 04/10] mm: Refer to zones from memory regions
From: Ankita Garg <gargankita@...il.com>
With the introduction of memory regions, the node_zones link inside
the node structure is removed. Hence, this patch modifies the VM
code to refer to zones from within memory regions instead of nodes.
Signed-off-by: Ankita Garg <gargankita@...il.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---
include/linux/mm.h | 2 -
include/linux/mmzone.h | 9 ++-
mm/page_alloc.c | 128 +++++++++++++++++++++++++++---------------------
3 files changed, 79 insertions(+), 60 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index f57eef0..27fc2d3 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1345,7 +1345,7 @@ extern int __meminit __early_pfn_to_nid(unsigned long pfn);
#endif
extern void set_dma_reserve(unsigned long new_dma_reserve);
-extern void memmap_init_zone(unsigned long, int, unsigned long,
+extern void memmap_init_zone(unsigned long, int, int, unsigned long,
unsigned long, enum memmap_context);
extern void setup_per_zone_wmarks(void);
extern int __meminit init_per_zone_wmark_min(void);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 6f5d533..4abc7d5 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -842,7 +842,8 @@ static inline int is_normal_idx(enum zone_type idx)
static inline int is_highmem(struct zone *zone)
{
#ifdef CONFIG_HIGHMEM
- int zone_off = (char *)zone - (char *)zone->zone_pgdat->node_zones;
+ int zone_off = (char *)zone -
+ (char *)zone->zone_mem_region->region_zones;
return zone_off == ZONE_HIGHMEM * sizeof(*zone) ||
(zone_off == ZONE_MOVABLE * sizeof(*zone) &&
zone_movable_is_highmem());
@@ -853,13 +854,13 @@ static inline int is_highmem(struct zone *zone)
static inline int is_normal(struct zone *zone)
{
- return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL;
+ return zone == zone->zone_mem_region->region_zones + ZONE_NORMAL;
}
static inline int is_dma32(struct zone *zone)
{
#ifdef CONFIG_ZONE_DMA32
- return zone == zone->zone_pgdat->node_zones + ZONE_DMA32;
+ return zone == zone->zone_mem_region->region_zones + ZONE_DMA32;
#else
return 0;
#endif
@@ -868,7 +869,7 @@ static inline int is_dma32(struct zone *zone)
static inline int is_dma(struct zone *zone)
{
#ifdef CONFIG_ZONE_DMA
- return zone == zone->zone_pgdat->node_zones + ZONE_DMA;
+ return zone == zone->zone_mem_region->region_zones + ZONE_DMA;
#else
return 0;
#endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c807272..a8e86b5 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3797,8 +3797,8 @@ static void setup_zone_migrate_reserve(struct zone *zone)
* up by free_all_bootmem() once the early boot process is
* done. Non-atomic initialization, single-pass.
*/
-void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
- unsigned long start_pfn, enum memmap_context context)
+void __meminit memmap_init_zone(unsigned long size, int nid, int region,
+ unsigned long zone, unsigned long start_pfn, enum memmap_context context)
{
struct page *page;
unsigned long end_pfn = start_pfn + size;
@@ -3808,7 +3808,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone,
if (highest_memmap_pfn < end_pfn - 1)
highest_memmap_pfn = end_pfn - 1;
- z = &NODE_DATA(nid)->node_zones[zone];
+ z = &NODE_DATA(nid)->node_regions[region].region_zones[zone];
for (pfn = start_pfn; pfn < end_pfn; pfn++) {
/*
* There can be holes in boot-time mem_map[]s
@@ -3865,8 +3865,8 @@ static void __meminit zone_init_free_lists(struct zone *zone)
}
#ifndef __HAVE_ARCH_MEMMAP_INIT
-#define memmap_init(size, nid, zone, start_pfn) \
- memmap_init_zone((size), (nid), (zone), (start_pfn), MEMMAP_EARLY)
+#define memmap_init(size, nid, region, zone, start_pfn) \
+ memmap_init_zone((size), (nid), (region), (zone), (start_pfn), MEMMAP_EARLY)
#endif
static int __meminit zone_batchsize(struct zone *zone)
@@ -4045,11 +4045,13 @@ int __meminit init_currently_empty_zone(struct zone *zone,
enum memmap_context context)
{
struct pglist_data *pgdat = zone->zone_pgdat;
+ struct mem_region *region = zone->zone_mem_region;
int ret;
ret = zone_wait_table_init(zone, size);
if (ret)
return ret;
- pgdat->nr_zones = zone_idx(zone) + 1;
+ pgdat->nr_node_zone_types = zone_idx(zone) + 1;
+ region->nr_region_zones = zone_idx(zone) + 1;
zone->zone_start_pfn = zone_start_pfn;
@@ -4058,7 +4060,6 @@ int __meminit init_currently_empty_zone(struct zone *zone,
pgdat->node_id,
(unsigned long)zone_idx(zone),
zone_start_pfn, (zone_start_pfn + size));
-
zone_init_free_lists(zone);
return 0;
@@ -4566,7 +4567,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
ret = init_currently_empty_zone(zone, zone_start_pfn,
size, MEMMAP_EARLY);
BUG_ON(ret);
- memmap_init(size, nid, j, zone_start_pfn);
+ memmap_init(size, nid, region->region, j, zone_start_pfn);
zone_start_pfn += size;
}
}
@@ -4613,13 +4614,17 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat)
#endif /* CONFIG_FLAT_NODE_MEM_MAP */
}
+/*
+ * Todo: This routine needs more modifications, but not required for the
+ * minimalistic config options, to start with
+ */
void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
unsigned long node_start_pfn, unsigned long *zholes_size)
{
pg_data_t *pgdat = NODE_DATA(nid);
/* pg_data_t should be reset to zero when it's allocated */
- WARN_ON(pgdat->nr_zones || pgdat->classzone_idx);
+ WARN_ON(pgdat->nr_node_zone_types || pgdat->classzone_idx);
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
@@ -5109,35 +5114,38 @@ static void calculate_totalreserve_pages(void)
{
struct pglist_data *pgdat;
unsigned long reserve_pages = 0;
+ struct mem_region *region;
enum zone_type i, j;
for_each_online_pgdat(pgdat) {
for (i = 0; i < MAX_NR_ZONES; i++) {
- struct zone *zone = pgdat->node_zones + i;
- unsigned long max = 0;
-
- /* Find valid and maximum lowmem_reserve in the zone */
- for (j = i; j < MAX_NR_ZONES; j++) {
- if (zone->lowmem_reserve[j] > max)
- max = zone->lowmem_reserve[j];
- }
+ for_each_mem_region_in_node(region, pgdat->node_id) {
+ struct zone *zone = region->region_zones + i;
+ unsigned long max = 0;
+
+ /* Find valid and maximum lowmem_reserve in the zone */
+ for (j = i; j < MAX_NR_ZONES; j++) {
+ if (zone->lowmem_reserve[j] > max)
+ max = zone->lowmem_reserve[j];
+ }
- /* we treat the high watermark as reserved pages. */
- max += high_wmark_pages(zone);
+ /* we treat the high watermark as reserved pages. */
+ max += high_wmark_pages(zone);
- if (max > zone->present_pages)
- max = zone->present_pages;
- reserve_pages += max;
- /*
- * Lowmem reserves are not available to
- * GFP_HIGHUSER page cache allocations and
- * kswapd tries to balance zones to their high
- * watermark. As a result, neither should be
- * regarded as dirtyable memory, to prevent a
- * situation where reclaim has to clean pages
- * in order to balance the zones.
- */
- zone->dirty_balance_reserve = max;
+ if (max > zone->present_pages)
+ max = zone->present_pages;
+ reserve_pages += max;
+ /*
+ * Lowmem reserves are not available to
+ * GFP_HIGHUSER page cache allocations and
+ * kswapd tries to balance zones to their high
+ * watermark. As a result, neither should be
+ * regarded as dirtyable memory, to prevent a
+ * situation where reclaim has to clean pages
+ * in order to balance the zones.
+ */
+ zone->dirty_balance_reserve = max;
+ }
}
}
dirty_balance_reserve = reserve_pages;
@@ -5154,27 +5162,30 @@ static void setup_per_zone_lowmem_reserve(void)
{
struct pglist_data *pgdat;
enum zone_type j, idx;
+ struct mem_region *region;
for_each_online_pgdat(pgdat) {
for (j = 0; j < MAX_NR_ZONES; j++) {
- struct zone *zone = pgdat->node_zones + j;
- unsigned long present_pages = zone->present_pages;
+ for_each_mem_region_in_node(region, pgdat->node_id) {
+ struct zone *zone = region->region_zones + j;
+ unsigned long present_pages = zone->present_pages;
- zone->lowmem_reserve[j] = 0;
+ zone->lowmem_reserve[j] = 0;
- idx = j;
- while (idx) {
- struct zone *lower_zone;
+ idx = j;
+ while (idx) {
+ struct zone *lower_zone;
- idx--;
+ idx--;
- if (sysctl_lowmem_reserve_ratio[idx] < 1)
- sysctl_lowmem_reserve_ratio[idx] = 1;
+ if (sysctl_lowmem_reserve_ratio[idx] < 1)
+ sysctl_lowmem_reserve_ratio[idx] = 1;
- lower_zone = pgdat->node_zones + idx;
- lower_zone->lowmem_reserve[j] = present_pages /
- sysctl_lowmem_reserve_ratio[idx];
- present_pages += lower_zone->present_pages;
+ lower_zone = region->region_zones + idx;
+ lower_zone->lowmem_reserve[j] = present_pages /
+ sysctl_lowmem_reserve_ratio[idx];
+ present_pages += lower_zone->present_pages;
+ }
}
}
}
@@ -6159,13 +6170,16 @@ void dump_page(struct page *page)
/* reset zone->present_pages */
void reset_zone_present_pages(void)
{
+ struct mem_region *region;
struct zone *z;
int i, nid;
for_each_node_state(nid, N_HIGH_MEMORY) {
for (i = 0; i < MAX_NR_ZONES; i++) {
- z = NODE_DATA(nid)->node_zones + i;
- z->present_pages = 0;
+ for_each_mem_region_in_node(region, nid) {
+ z = region->region_zones + i;
+ z->present_pages = 0;
+ }
}
}
}
@@ -6177,15 +6191,19 @@ void fixup_zone_present_pages(int nid, unsigned long start_pfn,
struct zone *z;
unsigned long zone_start_pfn, zone_end_pfn;
int i;
+ struct mem_region *region;
for (i = 0; i < MAX_NR_ZONES; i++) {
- z = NODE_DATA(nid)->node_zones + i;
- zone_start_pfn = z->zone_start_pfn;
- zone_end_pfn = zone_start_pfn + z->spanned_pages;
-
- /* if the two regions intersect */
- if (!(zone_start_pfn >= end_pfn || zone_end_pfn <= start_pfn))
- z->present_pages += min(end_pfn, zone_end_pfn) -
- max(start_pfn, zone_start_pfn);
+ for_each_mem_region_in_node(region, nid) {
+ z = region->region_zones + i;
+ zone_start_pfn = z->zone_start_pfn;
+ zone_end_pfn = zone_start_pfn + z->spanned_pages;
+
+ /* if the two regions intersect */
+ if (!(zone_start_pfn >= end_pfn ||
+ zone_end_pfn <= start_pfn))
+ z->present_pages += min(end_pfn, zone_end_pfn) -
+ max(start_pfn, zone_start_pfn);
+ }
}
}
--
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