1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _LINUX_MMZONE_H 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _LINUX_MMZONE_H 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef __KERNEL__ 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef __ASSEMBLY__ 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/spinlock.h> 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/list.h> 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/wait.h> 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/cache.h> 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/threads.h> 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/numa.h> 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/init.h> 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/seqlock.h> 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/nodemask.h> 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/atomic.h> 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/page.h> 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Free memory management - zoned buddy allocator. */ 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef CONFIG_FORCE_MAX_ZONEORDER 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_ORDER 11 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1)) 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct free_area { 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head free_list; 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_free; 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct pglist_data; 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zone->lock and zone->lru_lock are two of the hottest locks in the kernel. 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * So add a wild amount of padding here to ensure that they fall into separate 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * cachelines. There are very few zone structures in the machine, so space 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * consumption is not a concern here. 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if defined(CONFIG_SMP) 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct zone_padding { 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char x[0]; 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} ____cacheline_internodealigned_in_smp; 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_PADDING(name) struct zone_padding name; 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_PADDING(name) 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruenum zone_stat_item { 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_ANON_PAGES, /* Mapped anonymous pages */ 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_FILE_MAPPED, /* pagecache pages mapped into pagetables. 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru only modified from process context */ 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_FILE_PAGES, 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_SLAB, /* Pages used by slab allocator */ 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_PAGETABLE, /* used for pagetables */ 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_FILE_DIRTY, 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_WRITEBACK, 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_UNSTABLE_NFS, /* NFS unstable pages */ 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_BOUNCE, 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_NUMA 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_HIT, /* allocated in intended node */ 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_MISS, /* allocated in non intended node */ 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_FOREIGN, /* was intended here, hit elsewhere */ 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_INTERLEAVE_HIT, /* interleaver preferred this zone */ 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_LOCAL, /* allocation from local node */ 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NUMA_OTHER, /* allocation from other node */ 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru NR_VM_ZONE_STAT_ITEMS }; 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct per_cpu_pages { 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int count; /* number of pages in the list */ 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int high; /* high watermark, emptying needed */ 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int batch; /* chunk size for buddy add/remove */ 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head list; /* the list of pages */ 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct per_cpu_pageset { 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */ 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SMP 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru s8 stat_threshold; 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS]; 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} ____cacheline_aligned_in_smp; 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_NUMA 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define zone_pcp(__z, __cpu) ((__z)->pageset[(__cpu)]) 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)]) 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_DMA 0 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_DMA32 1 93c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_NORMAL 2 94c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONE_HIGHMEM 3 95c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 96c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_NR_ZONES 4 /* Sync this with ZONES_SHIFT */ 97c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define ZONES_SHIFT 2 /* ceil(log2(MAX_NR_ZONES)) */ 98c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 99c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 100c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 101c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * When a memory allocation must conform to specific limitations (such 102c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * as being suitable for DMA) the caller will pass in hints to the 103c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * allocator in the gfp_mask, in the zone modifier bits. These bits 104c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * are used to select a priority ordered list of memory zones which 105c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * match the requested limits. GFP_ZONEMASK defines which bits within 106c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the gfp_mask should be considered as zone modifiers. Each valid 107c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * combination of the zone modifier bits has a corresponding list 108c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * of zones (in node_zonelists). Thus for two zone modifiers there 109c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * will be a maximum of 4 (2 ** 2) zonelists, for 3 modifiers there will 110c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * be 8 (2 ** 3) zonelists. GFP_ZONETYPES defines the number of possible 111c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * combinations of zone modifiers in "zone modifier space". 112c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 113c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * As an optimisation any zone modifier bits which are only valid when 114c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * no other zone modifier bits are set (loners) should be placed in 115c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the highest order bits of this field. This allows us to reduce the 116c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * extent of the zonelists thus saving space. For example in the case 117c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * of three zone modifier bits, we could require up to eight zonelists. 118c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * If the left most zone modifier is a "loner" then the highest valid 119c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zonelist would be four allowing us to allocate only five zonelists. 120c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Use the first form for GFP_ZONETYPES when the left most bit is not 121c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * a "loner", otherwise use the second. 122c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 123c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * NOTE! Make sure this matches the zones in <linux/gfp.h> 124c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 125c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define GFP_ZONEMASK 0x07 126c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* #define GFP_ZONETYPES (GFP_ZONEMASK + 1) */ /* Non-loner */ 127c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define GFP_ZONETYPES ((GFP_ZONEMASK + 1) / 2 + 1) /* Loner */ 128c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 129c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 130c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * On machines where it is needed (eg PCs) we divide physical memory 131c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * into multiple physical zones. On a 32bit PC we have 4 zones: 132c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 133c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ZONE_DMA < 16 MB ISA DMA capable memory 134c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ZONE_DMA32 0 MB Empty 135c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ZONE_NORMAL 16-896 MB direct mapped by the kernel 136c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * ZONE_HIGHMEM > 896 MB only page cache and user processes 137c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 138c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 139c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct zone { 140c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Fields commonly accessed by the page allocator */ 141c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long free_pages; 142c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long pages_min, pages_low, pages_high; 143c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 144c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * We don't know if the memory that we're going to allocate will be freeable 145c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * or/and it will be released eventually, so to avoid totally wasting several 146c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * GB of ram we must reserve some of the lower zone memory (otherwise we risk 147c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to run OOM on the lower zones despite there's tons of freeable ram 148c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * on the higher zones). This array is recalculated at runtime if the 149c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * sysctl_lowmem_reserve_ratio sysctl changes. 150c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 151c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long lowmem_reserve[MAX_NR_ZONES]; 152c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 153c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_NUMA 154c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 155c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zone reclaim becomes active if more unmapped pages exist. 156c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 157c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long min_unmapped_ratio; 158c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct per_cpu_pageset *pageset[NR_CPUS]; 159c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 160c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct per_cpu_pageset pageset[NR_CPUS]; 161c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 162c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 163c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * free areas of different sizes 164c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 165c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t lock; 166c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_MEMORY_HOTPLUG 167c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* see spanned/present_pages for more description */ 168c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru seqlock_t span_seqlock; 169c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 170c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct free_area free_area[MAX_ORDER]; 171c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 172c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 173c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ZONE_PADDING(_pad1_) 174c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 175c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Fields commonly accessed by the page reclaim scanner */ 176c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t lru_lock; 177c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head active_list; 178c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct list_head inactive_list; 179c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_scan_active; 180c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_scan_inactive; 181c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_active; 182c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long nr_inactive; 183c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long pages_scanned; /* since last reclaim */ 184c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int all_unreclaimable; /* All pages pinned */ 185c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 186c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* A count of how many reclaimers are scanning this zone */ 187c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_t reclaim_in_progress; 188c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 189c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Zone statistics */ 190c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS]; 191c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 192c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 193c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * prev_priority holds the scanning priority for this zone. It is 194c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * defined as the scanning priority at which we achieved our reclaim 195c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * target at the previous try_to_free_pages() or balance_pgdat() 196c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * invokation. 197c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 198c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * We use prev_priority as a measure of how much stress page reclaim is 199c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * under - it drives the swappiness decision: whether to unmap mapped 200c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * pages. 201c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 202c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * temp_priority is used to remember the scanning priority at which 203c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * this zone was successfully refilled to free_pages == pages_high. 204c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 205c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Access to both these fields is quite racy even on uniprocessor. But 206c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * it is expected to average out OK. 207c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 208c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int temp_priority; 209c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int prev_priority; 210c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 211c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 212c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru ZONE_PADDING(_pad2_) 213c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* Rarely used or read-mostly fields */ 214c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 215c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 216c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * wait_table -- the array holding the hash table 217c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * wait_table_hash_nr_entries -- the size of the hash table array 218c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * wait_table_bits -- wait_table_size == (1 << wait_table_bits) 219c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 220c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The purpose of all these is to keep track of the people 221c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * waiting for a page to become available and make them 222c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * runnable again when possible. The trouble is that this 223c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * consumes a lot of space, especially when so few things 224c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * wait on pages at a given time. So instead of using 225c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * per-page waitqueues, we use a waitqueue hash table. 226c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 227c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The bucket discipline is to sleep on the same queue when 228c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * colliding and wake all in that wait queue when removing. 229c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * When something wakes, it must check to be sure its page is 230c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * truly available, a la thundering herd. The cost of a 231c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * collision is great, but given the expected load of the 232c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * table, they should be so rare as to be outweighed by the 233c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * benefits from the saved space. 234c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 235c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * __wait_on_page_locked() and unlock_page() in mm/filemap.c, are the 236c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * primary users of these fields, and in mm/page_alloc.c 237c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * free_area_init_core() performs the initialization of them. 238c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 239c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t * wait_table; 240c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long wait_table_hash_nr_entries; 241c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long wait_table_bits; 242c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 243c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 244c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Discontig memory support fields. 245c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 246c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct pglist_data *zone_pgdat; 247c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */ 248c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long zone_start_pfn; 249c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 250c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 251c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zone_start_pfn, spanned_pages and present_pages are all 252c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * protected by span_seqlock. It is a seqlock because it has 253c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to be read outside of zone->lock, and it is done in the main 254c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * allocator path. But, it is written quite infrequently. 255c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 256c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The lock is declared along with zone->lock because it is 257c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * frequently read in proximity to zone->lock. It's good to 258c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * give them a chance of being in the same cacheline. 259c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 260c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long spanned_pages; /* total size, including holes */ 261c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long present_pages; /* amount of memory (excluding holes) */ 262c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 263c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 264c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * rarely used fields: 265c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 266c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru char *name; 267c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} ____cacheline_internodealigned_in_smp; 268c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 269c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 270c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 271c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The "priority" of VM scanning is how much of the queues we will scan in one 272c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the 273c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * queues ("queue_length >> 12") during an aging round. 274c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 275c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define DEF_PRIORITY 12 276c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 277c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 278c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * One allocation request operates on a zonelist. A zonelist 279c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * is a list of zones, the first one is the 'goal' of the 280c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * allocation, the other zones are fallback zones, in decreasing 281c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * priority. 282c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 283c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Right now a zonelist takes up less than a cacheline. We never 284c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * modify it apart from boot-up, and only a few indices are used, 285c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * so despite the zonelist table being relatively big, the cache 286c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * footprint of this construct is very small. 287c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 288c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct zonelist { 289c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct zone *zones[MAX_NUMNODES * MAX_NR_ZONES + 1]; // NULL delimited 290c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 291c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 292c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 293c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 294c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM 295c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (mostly NUMA machines?) to denote a higher-level memory zone than the 296c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zone denotes. 297c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 298c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * On NUMA machines, each NUMA node would have a pg_data_t to describe 299c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * it's memory layout. 300c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 301c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Memory statistics and page replacement data structures are maintained on a 302c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * per-zone basis. 303c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 304c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct bootmem_data; 305c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querutypedef struct pglist_data { 306c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct zone node_zones[MAX_NR_ZONES]; 307c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct zonelist node_zonelists[GFP_ZONETYPES]; 308c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int nr_zones; 309c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_FLAT_NODE_MEM_MAP 310c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct page *node_mem_map; 311c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 312c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct bootmem_data *bdata; 313c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_MEMORY_HOTPLUG 314c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 315c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Must be held any time you expect node_start_pfn, node_present_pages 316c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * or node_spanned_pages stay constant. Holding this will also 317c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * guarantee that any pfn_valid() stays that way. 318c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 319c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Nests above zone->lock and zone->size_seqlock. 320c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 321c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru spinlock_t node_size_lock; 322c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 323c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long node_start_pfn; 324c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long node_present_pages; /* total number of physical pages */ 325c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long node_spanned_pages; /* total size of physical page 326c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru range, including holes */ 327c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int node_id; 328c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru wait_queue_head_t kswapd_wait; 329c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct task_struct *kswapd; 330c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int kswapd_max_order; 331c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} pg_data_t; 332c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 333c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages) 334c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages) 335c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_FLAT_NODE_MEM_MAP 336c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pgdat_page_nr(pgdat, pagenr) ((pgdat)->node_mem_map + (pagenr)) 337c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 338c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pgdat_page_nr(pgdat, pagenr) pfn_to_page((pgdat)->node_start_pfn + (pagenr)) 339c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 340c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr)) 341c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 342c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/memory_hotplug.h> 343c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 344c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid __get_zone_counts(unsigned long *active, unsigned long *inactive, 345c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *free, struct pglist_data *pgdat); 346c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid get_zone_counts(unsigned long *active, unsigned long *inactive, 347c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long *free); 348c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid build_all_zonelists(void); 349c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid wakeup_kswapd(struct zone *zone, int order); 350c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint zone_watermark_ok(struct zone *z, int order, unsigned long mark, 351c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int classzone_idx, int alloc_flags); 352c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 353c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int init_currently_empty_zone(struct zone *zone, unsigned long start_pfn, 354c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long size); 355c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 356c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_HAVE_MEMORY_PRESENT 357c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid memory_present(int nid, unsigned long start, unsigned long end); 358c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 359c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void memory_present(int nid, unsigned long start, unsigned long end) {} 360c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 361c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 362c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_NEED_NODE_MEMMAP_SIZE 363c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruunsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); 364c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 365c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 366c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 367c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc. 368c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 369c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones) 370c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 371c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int populated_zone(struct zone *zone) 372c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 373c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (!!zone->present_pages); 374c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 375c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 376c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_highmem_idx(int idx) 377c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 378c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (idx == ZONE_HIGHMEM); 379c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 380c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 381c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_normal_idx(int idx) 382c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 383c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (idx == ZONE_NORMAL); 384c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 385c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 386c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/** 387c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * is_highmem - helper function to quickly check if a struct zone is a 388c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * highmem zone or not. This is an attempt to keep references 389c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum. 390c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @zone - pointer to struct zone variable 391c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 392c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_highmem(struct zone *zone) 393c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 394c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM; 395c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 396c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 397c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_normal(struct zone *zone) 398c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 399c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL; 400c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 401c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 402c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_dma32(struct zone *zone) 403c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 404c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return zone == zone->zone_pgdat->node_zones + ZONE_DMA32; 405c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 406c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 407c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int is_dma(struct zone *zone) 408c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 409c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return zone == zone->zone_pgdat->node_zones + ZONE_DMA; 410c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 411c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 412c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* These two functions are used to setup the per zone pages min values */ 413c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct ctl_table; 414c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct file; 415c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *, 416c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void __user *, size_t *, loff_t *); 417c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1]; 418c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, struct file *, 419c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void __user *, size_t *, loff_t *); 420c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint percpu_pagelist_fraction_sysctl_handler(struct ctl_table *, int, struct file *, 421c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru void __user *, size_t *, loff_t *); 422c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *, int, 423c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct file *, void __user *, size_t *, loff_t *); 424c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 425c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/topology.h> 426c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Returns the number of the current Node. */ 427c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef numa_node_id 428c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define numa_node_id() (cpu_to_node(raw_smp_processor_id())) 429c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 430c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 431c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef CONFIG_NEED_MULTIPLE_NODES 432c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 433c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct pglist_data contig_page_data; 434c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NODE_DATA(nid) (&contig_page_data) 435c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NODE_MEM_MAP(nid) mem_map 436c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define MAX_NODES_SHIFT 1 437c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 438c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else /* CONFIG_NEED_MULTIPLE_NODES */ 439c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 440c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/mmzone.h> 441c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 442c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* !CONFIG_NEED_MULTIPLE_NODES */ 443c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 444c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct pglist_data *first_online_pgdat(void); 445c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct pglist_data *next_online_pgdat(struct pglist_data *pgdat); 446c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct zone *next_zone(struct zone *zone); 447c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 448c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/** 449c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * for_each_pgdat - helper macro to iterate over all nodes 450c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @pgdat - pointer to a pg_data_t variable 451c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 452c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define for_each_online_pgdat(pgdat) \ 453c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru for (pgdat = first_online_pgdat(); \ 454c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgdat; \ 455c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru pgdat = next_online_pgdat(pgdat)) 456c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/** 457c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * for_each_zone - helper macro to iterate over all memory zones 458c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * @zone - pointer to struct zone variable 459c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 460c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * The user only needs to declare the zone variable, for_each_zone 461c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * fills it in. 462c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 463c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define for_each_zone(zone) \ 464c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru for (zone = (first_online_pgdat())->node_zones; \ 465c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru zone; \ 466c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru zone = next_zone(zone)) 467c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 468c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SPARSEMEM 469c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/sparsemem.h> 470c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 471c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 472c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if BITS_PER_LONG == 32 473c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 474c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * with 32 bit page->flags field, we reserve 9 bits for node/zone info. 475c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes. 476c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 477c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FLAGS_RESERVED 9 478c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 479c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#elif BITS_PER_LONG == 64 480c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 481c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * with 64 bit flags field, there's plenty of room. 482c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 483c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define FLAGS_RESERVED 32 484c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 485c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 486c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 487c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#error BITS_PER_LONG not defined 488c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 489c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 490c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 491c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID 492c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define early_pfn_to_nid(nid) (0UL) 493c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 494c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 495c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_FLATMEM 496c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pfn_to_nid(pfn) (0) 497c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 498c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 499c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT) 500c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT) 501c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 502c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SPARSEMEM 503c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 504c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 505c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * SECTION_SHIFT #bits space required to store a section # 506c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 507c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * PA_SECTION_SHIFT physical address to/from section number 508c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * PFN_SECTION_SHIFT pfn to/from section number 509c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 510c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS) 511c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 512c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PA_SECTION_SHIFT (SECTION_SIZE_BITS) 513c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT) 514c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 515c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT) 516c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 517c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT) 518c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1)) 519c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 520c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS 521c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#error Allocator MAX_ORDER exceeds SECTION_SIZE 522c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 523c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 524c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct page; 525c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct mem_section { 526c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru /* 527c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is, logically, a pointer to an array of struct 528c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * pages. However, it is stored with some other magic. 529c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (see sparse.c::sparse_init_one_section()) 530c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 531c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Additionally during early boot we encode node id of 532c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * the location of the section here to guide allocation. 533c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * (see sparse.c::memory_present()) 534c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 535c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Making it a UL at least makes someone do a cast 536c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * before using it wrong. 537c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 538c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long section_mem_map; 539c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 540c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 541c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SPARSEMEM_EXTREME 542c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section)) 543c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 544c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTIONS_PER_ROOT 1 545c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 546c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 547c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT) 548c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT) 549c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1) 550c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 551c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SPARSEMEM_EXTREME 552c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct mem_section *mem_section[NR_SECTION_ROOTS]; 553c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 554c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]; 555c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 556c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 557c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline struct mem_section *__nr_to_section(unsigned long nr) 558c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 559c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (!mem_section[SECTION_NR_TO_ROOT(nr)]) 560c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return NULL; 561c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK]; 562c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 563c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int __section_nr(struct mem_section* ms); 564c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 565c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 566c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * We use the lower bits of the mem_map pointer to store 567c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * a little bit of information. There should be at least 568c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 3 bits here due to 32-bit alignment. 569c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 570c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_MARKED_PRESENT (1UL<<0) 571c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_HAS_MEM_MAP (1UL<<1) 572c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_MAP_LAST_BIT (1UL<<2) 573c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1)) 574c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define SECTION_NID_SHIFT 2 575c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 576c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline struct page *__section_mem_map_addr(struct mem_section *section) 577c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 578c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long map = section->section_mem_map; 579c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru map &= SECTION_MAP_MASK; 580c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (struct page *)map; 581c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 582c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 583c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int valid_section(struct mem_section *section) 584c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 585c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (section && (section->section_mem_map & SECTION_MARKED_PRESENT)); 586c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 587c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 588c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int section_has_mem_map(struct mem_section *section) 589c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 590c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP)); 591c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 592c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 593c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int valid_section_nr(unsigned long nr) 594c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 595c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return valid_section(__nr_to_section(nr)); 596c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 597c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 598c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline struct mem_section *__pfn_to_section(unsigned long pfn) 599c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 600c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return __nr_to_section(pfn_to_section_nr(pfn)); 601c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 602c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 603c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int pfn_valid(unsigned long pfn) 604c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 605c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS) 606c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 607c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return valid_section(__nr_to_section(pfn_to_section_nr(pfn))); 608c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 609c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 610c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 611c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * These are _only_ used during initialisation, therefore they 612c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * can use __initdata ... They could have names to indicate 613c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * this restriction. 614c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 615c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_NUMA 616c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pfn_to_nid(pfn) \ 617c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru({ \ 618c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru unsigned long __pfn_to_nid_pfn = (pfn); \ 619c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru page_to_nid(pfn_to_page(__pfn_to_nid_pfn)); \ 620c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}) 621c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 622c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define pfn_to_nid(pfn) (0) 623c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 624c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 625c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define early_pfn_valid(pfn) pfn_valid(pfn) 626c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid sparse_init(void); 627c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 628c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define sparse_init() do {} while (0) 629c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define sparse_index_init(_sec, _nid) do {} while (0) 630c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* CONFIG_SPARSEMEM */ 631c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 632c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef early_pfn_valid 633c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define early_pfn_valid(pfn) (1) 634c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 635c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 636c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruvoid memory_present(int nid, unsigned long start, unsigned long end); 637c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruunsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long); 638c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 639c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* !__ASSEMBLY__ */ 640c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* __KERNEL__ */ 641c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* _LINUX_MMZONE_H */ 642