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631 lines
19 KiB
631 lines
19 KiB
#ifndef _LINUX_MMZONE_H
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#define _LINUX_MMZONE_H
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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#include <linux/config.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/cache.h>
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#include <linux/threads.h>
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#include <linux/numa.h>
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#include <linux/init.h>
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#include <linux/seqlock.h>
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#include <asm/atomic.h>
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/* Free memory management - zoned buddy allocator. */
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#ifndef CONFIG_FORCE_MAX_ZONEORDER
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#define MAX_ORDER 11
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#else
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#define MAX_ORDER CONFIG_FORCE_MAX_ZONEORDER
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#endif
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struct free_area {
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struct list_head free_list;
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unsigned long nr_free;
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};
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struct pglist_data;
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/*
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* zone->lock and zone->lru_lock are two of the hottest locks in the kernel.
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* So add a wild amount of padding here to ensure that they fall into separate
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* cachelines. There are very few zone structures in the machine, so space
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* consumption is not a concern here.
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*/
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#if defined(CONFIG_SMP)
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struct zone_padding {
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char x[0];
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} ____cacheline_maxaligned_in_smp;
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#define ZONE_PADDING(name) struct zone_padding name;
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#else
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#define ZONE_PADDING(name)
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#endif
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struct per_cpu_pages {
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int count; /* number of pages in the list */
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int low; /* low watermark, refill needed */
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int high; /* high watermark, emptying needed */
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int batch; /* chunk size for buddy add/remove */
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struct list_head list; /* the list of pages */
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};
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struct per_cpu_pageset {
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struct per_cpu_pages pcp[2]; /* 0: hot. 1: cold */
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#ifdef CONFIG_NUMA
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unsigned long numa_hit; /* allocated in intended node */
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unsigned long numa_miss; /* allocated in non intended node */
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unsigned long numa_foreign; /* was intended here, hit elsewhere */
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unsigned long interleave_hit; /* interleaver prefered this zone */
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unsigned long local_node; /* allocation from local node */
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unsigned long other_node; /* allocation from other node */
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#endif
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} ____cacheline_aligned_in_smp;
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#ifdef CONFIG_NUMA
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#define zone_pcp(__z, __cpu) ((__z)->pageset[(__cpu)])
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#else
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#define zone_pcp(__z, __cpu) (&(__z)->pageset[(__cpu)])
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#endif
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#define ZONE_DMA 0
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#define ZONE_DMA32 1
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#define ZONE_NORMAL 2
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#define ZONE_HIGHMEM 3
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#define MAX_NR_ZONES 4 /* Sync this with ZONES_SHIFT */
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#define ZONES_SHIFT 2 /* ceil(log2(MAX_NR_ZONES)) */
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/*
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* When a memory allocation must conform to specific limitations (such
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* as being suitable for DMA) the caller will pass in hints to the
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* allocator in the gfp_mask, in the zone modifier bits. These bits
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* are used to select a priority ordered list of memory zones which
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* match the requested limits. GFP_ZONEMASK defines which bits within
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* the gfp_mask should be considered as zone modifiers. Each valid
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* combination of the zone modifier bits has a corresponding list
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* of zones (in node_zonelists). Thus for two zone modifiers there
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* will be a maximum of 4 (2 ** 2) zonelists, for 3 modifiers there will
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* be 8 (2 ** 3) zonelists. GFP_ZONETYPES defines the number of possible
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* combinations of zone modifiers in "zone modifier space".
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*
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* NOTE! Make sure this matches the zones in <linux/gfp.h>
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*/
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#define GFP_ZONEMASK 0x07
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#define GFP_ZONETYPES 5
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/*
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* On machines where it is needed (eg PCs) we divide physical memory
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* into multiple physical zones. On a PC we have 4 zones:
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*
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* ZONE_DMA < 16 MB ISA DMA capable memory
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* ZONE_DMA32 0 MB Empty
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* ZONE_NORMAL 16-896 MB direct mapped by the kernel
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* ZONE_HIGHMEM > 896 MB only page cache and user processes
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*/
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struct zone {
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/* Fields commonly accessed by the page allocator */
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unsigned long free_pages;
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unsigned long pages_min, pages_low, pages_high;
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/*
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* We don't know if the memory that we're going to allocate will be freeable
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* or/and it will be released eventually, so to avoid totally wasting several
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* GB of ram we must reserve some of the lower zone memory (otherwise we risk
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* to run OOM on the lower zones despite there's tons of freeable ram
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* on the higher zones). This array is recalculated at runtime if the
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* sysctl_lowmem_reserve_ratio sysctl changes.
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*/
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unsigned long lowmem_reserve[MAX_NR_ZONES];
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#ifdef CONFIG_NUMA
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struct per_cpu_pageset *pageset[NR_CPUS];
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#else
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struct per_cpu_pageset pageset[NR_CPUS];
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#endif
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/*
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* free areas of different sizes
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*/
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spinlock_t lock;
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#ifdef CONFIG_MEMORY_HOTPLUG
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/* see spanned/present_pages for more description */
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seqlock_t span_seqlock;
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#endif
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struct free_area free_area[MAX_ORDER];
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ZONE_PADDING(_pad1_)
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/* Fields commonly accessed by the page reclaim scanner */
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spinlock_t lru_lock;
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struct list_head active_list;
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struct list_head inactive_list;
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unsigned long nr_scan_active;
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unsigned long nr_scan_inactive;
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unsigned long nr_active;
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unsigned long nr_inactive;
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unsigned long pages_scanned; /* since last reclaim */
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int all_unreclaimable; /* All pages pinned */
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/*
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* Does the allocator try to reclaim pages from the zone as soon
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* as it fails a watermark_ok() in __alloc_pages?
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*/
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int reclaim_pages;
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/* A count of how many reclaimers are scanning this zone */
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atomic_t reclaim_in_progress;
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/*
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* prev_priority holds the scanning priority for this zone. It is
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* defined as the scanning priority at which we achieved our reclaim
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* target at the previous try_to_free_pages() or balance_pgdat()
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* invokation.
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*
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* We use prev_priority as a measure of how much stress page reclaim is
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* under - it drives the swappiness decision: whether to unmap mapped
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* pages.
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*
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* temp_priority is used to remember the scanning priority at which
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* this zone was successfully refilled to free_pages == pages_high.
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*
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* Access to both these fields is quite racy even on uniprocessor. But
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* it is expected to average out OK.
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*/
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int temp_priority;
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int prev_priority;
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ZONE_PADDING(_pad2_)
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/* Rarely used or read-mostly fields */
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/*
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* wait_table -- the array holding the hash table
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* wait_table_size -- the size of the hash table array
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* wait_table_bits -- wait_table_size == (1 << wait_table_bits)
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*
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* The purpose of all these is to keep track of the people
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* waiting for a page to become available and make them
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* runnable again when possible. The trouble is that this
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* consumes a lot of space, especially when so few things
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* wait on pages at a given time. So instead of using
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* per-page waitqueues, we use a waitqueue hash table.
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*
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* The bucket discipline is to sleep on the same queue when
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* colliding and wake all in that wait queue when removing.
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* When something wakes, it must check to be sure its page is
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* truly available, a la thundering herd. The cost of a
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* collision is great, but given the expected load of the
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* table, they should be so rare as to be outweighed by the
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* benefits from the saved space.
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*
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* __wait_on_page_locked() and unlock_page() in mm/filemap.c, are the
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* primary users of these fields, and in mm/page_alloc.c
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* free_area_init_core() performs the initialization of them.
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*/
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wait_queue_head_t * wait_table;
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unsigned long wait_table_size;
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unsigned long wait_table_bits;
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/*
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* Discontig memory support fields.
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*/
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struct pglist_data *zone_pgdat;
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struct page *zone_mem_map;
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/* zone_start_pfn == zone_start_paddr >> PAGE_SHIFT */
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unsigned long zone_start_pfn;
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/*
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* zone_start_pfn, spanned_pages and present_pages are all
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* protected by span_seqlock. It is a seqlock because it has
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* to be read outside of zone->lock, and it is done in the main
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* allocator path. But, it is written quite infrequently.
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*
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* The lock is declared along with zone->lock because it is
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* frequently read in proximity to zone->lock. It's good to
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* give them a chance of being in the same cacheline.
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*/
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unsigned long spanned_pages; /* total size, including holes */
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unsigned long present_pages; /* amount of memory (excluding holes) */
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/*
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* rarely used fields:
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*/
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char *name;
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} ____cacheline_maxaligned_in_smp;
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/*
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* The "priority" of VM scanning is how much of the queues we will scan in one
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* go. A value of 12 for DEF_PRIORITY implies that we will scan 1/4096th of the
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* queues ("queue_length >> 12") during an aging round.
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*/
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#define DEF_PRIORITY 12
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/*
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* One allocation request operates on a zonelist. A zonelist
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* is a list of zones, the first one is the 'goal' of the
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* allocation, the other zones are fallback zones, in decreasing
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* priority.
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*
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* Right now a zonelist takes up less than a cacheline. We never
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* modify it apart from boot-up, and only a few indices are used,
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* so despite the zonelist table being relatively big, the cache
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* footprint of this construct is very small.
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*/
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struct zonelist {
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struct zone *zones[MAX_NUMNODES * MAX_NR_ZONES + 1]; // NULL delimited
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};
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/*
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* The pg_data_t structure is used in machines with CONFIG_DISCONTIGMEM
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* (mostly NUMA machines?) to denote a higher-level memory zone than the
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* zone denotes.
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*
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* On NUMA machines, each NUMA node would have a pg_data_t to describe
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* it's memory layout.
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*
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* Memory statistics and page replacement data structures are maintained on a
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* per-zone basis.
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*/
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struct bootmem_data;
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typedef struct pglist_data {
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struct zone node_zones[MAX_NR_ZONES];
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struct zonelist node_zonelists[GFP_ZONETYPES];
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int nr_zones;
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#ifdef CONFIG_FLAT_NODE_MEM_MAP
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struct page *node_mem_map;
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#endif
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struct bootmem_data *bdata;
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#ifdef CONFIG_MEMORY_HOTPLUG
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/*
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* Must be held any time you expect node_start_pfn, node_present_pages
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* or node_spanned_pages stay constant. Holding this will also
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* guarantee that any pfn_valid() stays that way.
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*
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* Nests above zone->lock and zone->size_seqlock.
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*/
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spinlock_t node_size_lock;
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#endif
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unsigned long node_start_pfn;
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unsigned long node_present_pages; /* total number of physical pages */
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unsigned long node_spanned_pages; /* total size of physical page
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range, including holes */
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int node_id;
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struct pglist_data *pgdat_next;
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wait_queue_head_t kswapd_wait;
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struct task_struct *kswapd;
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int kswapd_max_order;
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} pg_data_t;
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#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)
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#define node_spanned_pages(nid) (NODE_DATA(nid)->node_spanned_pages)
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#ifdef CONFIG_FLAT_NODE_MEM_MAP
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#define pgdat_page_nr(pgdat, pagenr) ((pgdat)->node_mem_map + (pagenr))
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#else
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#define pgdat_page_nr(pgdat, pagenr) pfn_to_page((pgdat)->node_start_pfn + (pagenr))
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#endif
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#define nid_page_nr(nid, pagenr) pgdat_page_nr(NODE_DATA(nid),(pagenr))
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#include <linux/memory_hotplug.h>
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extern struct pglist_data *pgdat_list;
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void __get_zone_counts(unsigned long *active, unsigned long *inactive,
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unsigned long *free, struct pglist_data *pgdat);
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void get_zone_counts(unsigned long *active, unsigned long *inactive,
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unsigned long *free);
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void build_all_zonelists(void);
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void wakeup_kswapd(struct zone *zone, int order);
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int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
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int classzone_idx, int alloc_flags);
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#ifdef CONFIG_HAVE_MEMORY_PRESENT
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void memory_present(int nid, unsigned long start, unsigned long end);
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#else
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static inline void memory_present(int nid, unsigned long start, unsigned long end) {}
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#endif
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#ifdef CONFIG_NEED_NODE_MEMMAP_SIZE
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unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
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#endif
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/*
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* zone_idx() returns 0 for the ZONE_DMA zone, 1 for the ZONE_NORMAL zone, etc.
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*/
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#define zone_idx(zone) ((zone) - (zone)->zone_pgdat->node_zones)
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/**
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* for_each_pgdat - helper macro to iterate over all nodes
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* @pgdat - pointer to a pg_data_t variable
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*
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* Meant to help with common loops of the form
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* pgdat = pgdat_list;
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* while(pgdat) {
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* ...
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* pgdat = pgdat->pgdat_next;
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* }
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*/
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#define for_each_pgdat(pgdat) \
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for (pgdat = pgdat_list; pgdat; pgdat = pgdat->pgdat_next)
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/*
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* next_zone - helper magic for for_each_zone()
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* Thanks to William Lee Irwin III for this piece of ingenuity.
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*/
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static inline struct zone *next_zone(struct zone *zone)
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{
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pg_data_t *pgdat = zone->zone_pgdat;
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if (zone < pgdat->node_zones + MAX_NR_ZONES - 1)
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zone++;
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else if (pgdat->pgdat_next) {
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pgdat = pgdat->pgdat_next;
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zone = pgdat->node_zones;
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} else
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zone = NULL;
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return zone;
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}
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/**
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* for_each_zone - helper macro to iterate over all memory zones
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* @zone - pointer to struct zone variable
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*
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* The user only needs to declare the zone variable, for_each_zone
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* fills it in. This basically means for_each_zone() is an
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* easier to read version of this piece of code:
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*
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* for (pgdat = pgdat_list; pgdat; pgdat = pgdat->node_next)
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* for (i = 0; i < MAX_NR_ZONES; ++i) {
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* struct zone * z = pgdat->node_zones + i;
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* ...
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* }
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* }
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*/
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#define for_each_zone(zone) \
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for (zone = pgdat_list->node_zones; zone; zone = next_zone(zone))
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static inline int is_highmem_idx(int idx)
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{
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return (idx == ZONE_HIGHMEM);
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}
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static inline int is_normal_idx(int idx)
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{
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return (idx == ZONE_NORMAL);
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}
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/**
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* is_highmem - helper function to quickly check if a struct zone is a
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* highmem zone or not. This is an attempt to keep references
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* to ZONE_{DMA/NORMAL/HIGHMEM/etc} in general code to a minimum.
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* @zone - pointer to struct zone variable
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*/
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static inline int is_highmem(struct zone *zone)
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{
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return zone == zone->zone_pgdat->node_zones + ZONE_HIGHMEM;
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}
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static inline int is_normal(struct zone *zone)
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{
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return zone == zone->zone_pgdat->node_zones + ZONE_NORMAL;
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}
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/* These two functions are used to setup the per zone pages min values */
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struct ctl_table;
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struct file;
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int min_free_kbytes_sysctl_handler(struct ctl_table *, int, struct file *,
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void __user *, size_t *, loff_t *);
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extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1];
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int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int, struct file *,
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void __user *, size_t *, loff_t *);
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#include <linux/topology.h>
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/* Returns the number of the current Node. */
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#ifndef numa_node_id
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#define numa_node_id() (cpu_to_node(raw_smp_processor_id()))
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#endif
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#ifndef CONFIG_NEED_MULTIPLE_NODES
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extern struct pglist_data contig_page_data;
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#define NODE_DATA(nid) (&contig_page_data)
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#define NODE_MEM_MAP(nid) mem_map
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#define MAX_NODES_SHIFT 1
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#define pfn_to_nid(pfn) (0)
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#else /* CONFIG_NEED_MULTIPLE_NODES */
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#include <asm/mmzone.h>
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#endif /* !CONFIG_NEED_MULTIPLE_NODES */
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#ifdef CONFIG_SPARSEMEM
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#include <asm/sparsemem.h>
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#endif
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#if BITS_PER_LONG == 32
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/*
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* with 32 bit page->flags field, we reserve 9 bits for node/zone info.
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* there are 4 zones (3 bits) and this leaves 9-3=6 bits for nodes.
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*/
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#define FLAGS_RESERVED 9
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#elif BITS_PER_LONG == 64
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/*
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* with 64 bit flags field, there's plenty of room.
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*/
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#define FLAGS_RESERVED 32
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#else
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#error BITS_PER_LONG not defined
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#endif
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#ifndef CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID
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#define early_pfn_to_nid(nid) (0UL)
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#endif
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#define pfn_to_section_nr(pfn) ((pfn) >> PFN_SECTION_SHIFT)
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#define section_nr_to_pfn(sec) ((sec) << PFN_SECTION_SHIFT)
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#ifdef CONFIG_SPARSEMEM
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/*
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* SECTION_SHIFT #bits space required to store a section #
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*
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* PA_SECTION_SHIFT physical address to/from section number
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* PFN_SECTION_SHIFT pfn to/from section number
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*/
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#define SECTIONS_SHIFT (MAX_PHYSMEM_BITS - SECTION_SIZE_BITS)
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#define PA_SECTION_SHIFT (SECTION_SIZE_BITS)
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#define PFN_SECTION_SHIFT (SECTION_SIZE_BITS - PAGE_SHIFT)
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#define NR_MEM_SECTIONS (1UL << SECTIONS_SHIFT)
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|
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#define PAGES_PER_SECTION (1UL << PFN_SECTION_SHIFT)
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|
#define PAGE_SECTION_MASK (~(PAGES_PER_SECTION-1))
|
|
|
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#if (MAX_ORDER - 1 + PAGE_SHIFT) > SECTION_SIZE_BITS
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|
#error Allocator MAX_ORDER exceeds SECTION_SIZE
|
|
#endif
|
|
|
|
struct page;
|
|
struct mem_section {
|
|
/*
|
|
* This is, logically, a pointer to an array of struct
|
|
* pages. However, it is stored with some other magic.
|
|
* (see sparse.c::sparse_init_one_section())
|
|
*
|
|
* Making it a UL at least makes someone do a cast
|
|
* before using it wrong.
|
|
*/
|
|
unsigned long section_mem_map;
|
|
};
|
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
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|
#define SECTIONS_PER_ROOT (PAGE_SIZE / sizeof (struct mem_section))
|
|
#else
|
|
#define SECTIONS_PER_ROOT 1
|
|
#endif
|
|
|
|
#define SECTION_NR_TO_ROOT(sec) ((sec) / SECTIONS_PER_ROOT)
|
|
#define NR_SECTION_ROOTS (NR_MEM_SECTIONS / SECTIONS_PER_ROOT)
|
|
#define SECTION_ROOT_MASK (SECTIONS_PER_ROOT - 1)
|
|
|
|
#ifdef CONFIG_SPARSEMEM_EXTREME
|
|
extern struct mem_section *mem_section[NR_SECTION_ROOTS];
|
|
#else
|
|
extern struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT];
|
|
#endif
|
|
|
|
static inline struct mem_section *__nr_to_section(unsigned long nr)
|
|
{
|
|
if (!mem_section[SECTION_NR_TO_ROOT(nr)])
|
|
return NULL;
|
|
return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
|
|
}
|
|
extern int __section_nr(struct mem_section* ms);
|
|
|
|
/*
|
|
* We use the lower bits of the mem_map pointer to store
|
|
* a little bit of information. There should be at least
|
|
* 3 bits here due to 32-bit alignment.
|
|
*/
|
|
#define SECTION_MARKED_PRESENT (1UL<<0)
|
|
#define SECTION_HAS_MEM_MAP (1UL<<1)
|
|
#define SECTION_MAP_LAST_BIT (1UL<<2)
|
|
#define SECTION_MAP_MASK (~(SECTION_MAP_LAST_BIT-1))
|
|
|
|
static inline struct page *__section_mem_map_addr(struct mem_section *section)
|
|
{
|
|
unsigned long map = section->section_mem_map;
|
|
map &= SECTION_MAP_MASK;
|
|
return (struct page *)map;
|
|
}
|
|
|
|
static inline int valid_section(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_MARKED_PRESENT));
|
|
}
|
|
|
|
static inline int section_has_mem_map(struct mem_section *section)
|
|
{
|
|
return (section && (section->section_mem_map & SECTION_HAS_MEM_MAP));
|
|
}
|
|
|
|
static inline int valid_section_nr(unsigned long nr)
|
|
{
|
|
return valid_section(__nr_to_section(nr));
|
|
}
|
|
|
|
/*
|
|
* Given a kernel address, find the home node of the underlying memory.
|
|
*/
|
|
#define kvaddr_to_nid(kaddr) pfn_to_nid(__pa(kaddr) >> PAGE_SHIFT)
|
|
|
|
static inline struct mem_section *__pfn_to_section(unsigned long pfn)
|
|
{
|
|
return __nr_to_section(pfn_to_section_nr(pfn));
|
|
}
|
|
|
|
#define pfn_to_page(pfn) \
|
|
({ \
|
|
unsigned long __pfn = (pfn); \
|
|
__section_mem_map_addr(__pfn_to_section(__pfn)) + __pfn; \
|
|
})
|
|
#define page_to_pfn(page) \
|
|
({ \
|
|
page - __section_mem_map_addr(__nr_to_section( \
|
|
page_to_section(page))); \
|
|
})
|
|
|
|
static inline int pfn_valid(unsigned long pfn)
|
|
{
|
|
if (pfn_to_section_nr(pfn) >= NR_MEM_SECTIONS)
|
|
return 0;
|
|
return valid_section(__nr_to_section(pfn_to_section_nr(pfn)));
|
|
}
|
|
|
|
/*
|
|
* These are _only_ used during initialisation, therefore they
|
|
* can use __initdata ... They could have names to indicate
|
|
* this restriction.
|
|
*/
|
|
#ifdef CONFIG_NUMA
|
|
#define pfn_to_nid early_pfn_to_nid
|
|
#endif
|
|
|
|
#define pfn_to_pgdat(pfn) \
|
|
({ \
|
|
NODE_DATA(pfn_to_nid(pfn)); \
|
|
})
|
|
|
|
#define early_pfn_valid(pfn) pfn_valid(pfn)
|
|
void sparse_init(void);
|
|
#else
|
|
#define sparse_init() do {} while (0)
|
|
#define sparse_index_init(_sec, _nid) do {} while (0)
|
|
#endif /* CONFIG_SPARSEMEM */
|
|
|
|
#ifdef CONFIG_NODES_SPAN_OTHER_NODES
|
|
#define early_pfn_in_nid(pfn, nid) (early_pfn_to_nid(pfn) == (nid))
|
|
#else
|
|
#define early_pfn_in_nid(pfn, nid) (1)
|
|
#endif
|
|
|
|
#ifndef early_pfn_valid
|
|
#define early_pfn_valid(pfn) (1)
|
|
#endif
|
|
|
|
void memory_present(int nid, unsigned long start, unsigned long end);
|
|
unsigned long __init node_memmap_size_bytes(int, unsigned long, unsigned long);
|
|
|
|
#endif /* !__ASSEMBLY__ */
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_MMZONE_H */
|
|
|