This patch adds the ZONE_EASYRCLM zone and updates relevant contants and
helper functions. After this patch is applied, memory that is hot-added on
the x86 will be placed in ZONE_EASYRCLM. Memory hot-added on the ppc64 still
goes to ZONE_DMA.
The value of GFP_ZONETYPES is debatable. It should reflect all possible
combinations of the zone modifiers which implies a value of 16. However, the
existing value does not reflect the ability to use zone bits in combination.
Signed-off-by: Mel Gorman <[email protected]>
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc1-mm1-101_antifrag_flags/include/linux/mmzone.h linux-2.6.16-rc1-mm1-102_addzone/include/linux/mmzone.h
--- linux-2.6.16-rc1-mm1-101_antifrag_flags/include/linux/mmzone.h 2006-01-19 11:21:59.000000000 +0000
+++ linux-2.6.16-rc1-mm1-102_addzone/include/linux/mmzone.h 2006-01-19 11:37:52.000000000 +0000
@@ -73,9 +73,10 @@ struct per_cpu_pageset {
#define ZONE_DMA32 1
#define ZONE_NORMAL 2
#define ZONE_HIGHMEM 3
+#define ZONE_EASYRCLM 4
-#define MAX_NR_ZONES 4 /* Sync this with ZONES_SHIFT */
-#define ZONES_SHIFT 2 /* ceil(log2(MAX_NR_ZONES)) */
+#define MAX_NR_ZONES 5 /* Sync this with ZONES_SHIFT */
+#define ZONES_SHIFT 3 /* ceil(log2(MAX_NR_ZONES)) */
/*
@@ -93,8 +94,8 @@ struct per_cpu_pageset {
*
* NOTE! Make sure this matches the zones in <linux/gfp.h>
*/
-#define GFP_ZONEMASK 0x07
-#define GFP_ZONETYPES 5
+#define GFP_ZONEMASK 0x0f
+#define GFP_ZONETYPES 9
/*
* On machines where it is needed (eg PCs) we divide physical memory
@@ -397,7 +398,7 @@ static inline int populated_zone(struct
static inline int is_highmem_idx(int idx)
{
- return (idx == ZONE_HIGHMEM);
+ return (idx == ZONE_HIGHMEM || idx == ZONE_EASYRCLM);
}
static inline int is_normal_idx(int idx)
@@ -413,7 +414,8 @@ static inline int is_normal_idx(int idx)
*/
static inline int is_highmem(struct zone *zone)
{
- return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM;
+ return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM ||
+ zone == zone->zone_pgdat->node_zones + ZONE_EASYRCLM;
}
static inline int is_normal(struct zone *zone)
diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc1-mm1-101_antifrag_flags/mm/page_alloc.c linux-2.6.16-rc1-mm1-102_addzone/mm/page_alloc.c
--- linux-2.6.16-rc1-mm1-101_antifrag_flags/mm/page_alloc.c 2006-01-19 11:21:59.000000000 +0000
+++ linux-2.6.16-rc1-mm1-102_addzone/mm/page_alloc.c 2006-01-19 11:37:52.000000000 +0000
@@ -68,7 +68,7 @@ static void fastcall free_hot_cold_page(
* TBD: should special case ZONE_DMA32 machines here - in those we normally
* don't need any ZONE_NORMAL reservation
*/
-int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { 256, 256, 32 };
+int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { 256, 256, 32, 32 };
EXPORT_SYMBOL(totalram_pages);
@@ -79,7 +79,8 @@ EXPORT_SYMBOL(totalram_pages);
struct zone *zone_table[1 << ZONETABLE_SHIFT] __read_mostly;
EXPORT_SYMBOL(zone_table);
-static char *zone_names[MAX_NR_ZONES] = { "DMA", "DMA32", "Normal", "HighMem" };
+static char *zone_names[MAX_NR_ZONES] = { "DMA", "DMA32", "Normal",
+ "HighMem", "EasyRclm" };
int min_free_kbytes = 1024;
unsigned long __initdata nr_kernel_pages;
@@ -760,6 +761,7 @@ static inline void prep_zero_page(struct
int i;
BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM);
+ BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_EASYRCLM)) == __GFP_EASYRCLM);
for(i = 0; i < (1 << order); i++)
clear_highpage(page + i);
}
@@ -1245,7 +1247,7 @@ unsigned int nr_free_buffer_pages(void)
*/
unsigned int nr_free_pagecache_pages(void)
{
- return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER));
+ return nr_free_zone_pages(gfp_zone(GFP_RCLMUSER));
}
#ifdef CONFIG_HIGHMEM
@@ -1255,7 +1257,7 @@ unsigned int nr_free_highpages (void)
unsigned int pages = 0;
for_each_pgdat(pgdat)
- pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages;
+ pages += pgdat->node_zones[ZONE_EASYRCLM].free_pages;
return pages;
}
@@ -1560,7 +1562,7 @@ static int __init build_zonelists_node(p
{
struct zone *zone;
- BUG_ON(zone_type > ZONE_HIGHMEM);
+ BUG_ON(zone_type > ZONE_EASYRCLM);
do {
zone = pgdat->node_zones + zone_type;
@@ -1580,6 +1582,8 @@ static int __init build_zonelists_node(p
static inline int highest_zone(int zone_bits)
{
int res = ZONE_NORMAL;
+ if (zone_bits & (__force int)__GFP_EASYRCLM)
+ res = ZONE_EASYRCLM;
if (zone_bits & (__force int)__GFP_HIGHMEM)
res = ZONE_HIGHMEM;
if (zone_bits & (__force int)__GFP_DMA32)
-
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