Messages in this thread Patch in this message | | | From | Mel Gorman <> | Subject | [PATCH 2/5] Create the ZONE_EASYRCLM zone | Date | Thu, 19 Jan 2006 19:08:56 +0000 (GMT) |
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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 <mel@csn.ul.ie> 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) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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