diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 180 |
1 files changed, 118 insertions, 62 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 234bd4895d14..dc523a1f270d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -49,13 +49,11 @@ nodemask_t node_online_map __read_mostly = { { [0] = 1UL } }; EXPORT_SYMBOL(node_online_map); nodemask_t node_possible_map __read_mostly = NODE_MASK_ALL; EXPORT_SYMBOL(node_possible_map); -struct pglist_data *pgdat_list __read_mostly; unsigned long totalram_pages __read_mostly; unsigned long totalhigh_pages __read_mostly; long nr_swap_pages; int percpu_pagelist_fraction; -static void fastcall free_hot_cold_page(struct page *page, int cold); static void __free_pages_ok(struct page *page, unsigned int order); /* @@ -190,7 +188,7 @@ static void prep_compound_page(struct page *page, unsigned long order) for (i = 0; i < nr_pages; i++) { struct page *p = page + i; - SetPageCompound(p); + __SetPageCompound(p); set_page_private(p, (unsigned long)page); } } @@ -209,10 +207,24 @@ static void destroy_compound_page(struct page *page, unsigned long order) if (unlikely(!PageCompound(p) | (page_private(p) != (unsigned long)page))) bad_page(page); - ClearPageCompound(p); + __ClearPageCompound(p); } } +static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) +{ + int i; + + BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM); + /* + * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO + * and __GFP_HIGHMEM from hard or soft interrupt context. + */ + BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt()); + for (i = 0; i < (1 << order); i++) + clear_highpage(page + i); +} + /* * function for dealing with page's order in buddy system. * zone->lock is already acquired when we use these. @@ -423,11 +435,6 @@ static void __free_pages_ok(struct page *page, unsigned int order) mutex_debug_check_no_locks_freed(page_address(page), PAGE_SIZE<<order); -#ifndef CONFIG_MMU - for (i = 1 ; i < (1 << order) ; ++i) - __put_page(page + i); -#endif - for (i = 0 ; i < (1 << order) ; ++i) reserved += free_pages_check(page + i); if (reserved) @@ -448,28 +455,23 @@ void fastcall __init __free_pages_bootmem(struct page *page, unsigned int order) if (order == 0) { __ClearPageReserved(page); set_page_count(page, 0); - - free_hot_cold_page(page, 0); + set_page_refcounted(page); + __free_page(page); } else { - LIST_HEAD(list); int loop; + prefetchw(page); for (loop = 0; loop < BITS_PER_LONG; loop++) { struct page *p = &page[loop]; - if (loop + 16 < BITS_PER_LONG) - prefetchw(p + 16); + if (loop + 1 < BITS_PER_LONG) + prefetchw(p + 1); __ClearPageReserved(p); set_page_count(p, 0); } - arch_free_page(page, order); - - mod_page_state(pgfree, 1 << order); - - list_add(&page->lru, &list); - kernel_map_pages(page, 1 << order, 0); - free_pages_bulk(page_zone(page), 1, &list, order); + set_page_refcounted(page); + __free_pages(page, order); } } @@ -507,7 +509,7 @@ static inline void expand(struct zone *zone, struct page *page, /* * This page is about to be returned from the page allocator */ -static int prep_new_page(struct page *page, int order) +static int prep_new_page(struct page *page, int order, gfp_t gfp_flags) { if (unlikely(page_mapcount(page) | (page->mapping != NULL) | @@ -536,8 +538,15 @@ static int prep_new_page(struct page *page, int order) 1 << PG_referenced | 1 << PG_arch_1 | 1 << PG_checked | 1 << PG_mappedtodisk); set_page_private(page, 0); - set_page_refs(page, order); + set_page_refcounted(page); kernel_map_pages(page, 1 << order, 1); + + if (gfp_flags & __GFP_ZERO) + prep_zero_page(page, order, gfp_flags); + + if (order && (gfp_flags & __GFP_COMP)) + prep_compound_page(page, order); + return 0; } @@ -593,13 +602,14 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order, /* * Called from the slab reaper to drain pagesets on a particular node that * belong to the currently executing processor. + * Note that this function must be called with the thread pinned to + * a single processor. */ void drain_node_pages(int nodeid) { int i, z; unsigned long flags; - local_irq_save(flags); for (z = 0; z < MAX_NR_ZONES; z++) { struct zone *zone = NODE_DATA(nodeid)->node_zones + z; struct per_cpu_pageset *pset; @@ -609,11 +619,14 @@ void drain_node_pages(int nodeid) struct per_cpu_pages *pcp; pcp = &pset->pcp[i]; - free_pages_bulk(zone, pcp->count, &pcp->list, 0); - pcp->count = 0; + if (pcp->count) { + local_irq_save(flags); + free_pages_bulk(zone, pcp->count, &pcp->list, 0); + pcp->count = 0; + local_irq_restore(flags); + } } } - local_irq_restore(flags); } #endif @@ -743,13 +756,22 @@ void fastcall free_cold_page(struct page *page) free_hot_cold_page(page, 1); } -static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags) +/* + * split_page takes a non-compound higher-order page, and splits it into + * n (1<<order) sub-pages: page[0..n] + * Each sub-page must be freed individually. + * + * Note: this is probably too low level an operation for use in drivers. + * Please consult with lkml before using this in your driver. + */ +void split_page(struct page *page, unsigned int order) { int i; - BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM); - for(i = 0; i < (1 << order); i++) - clear_highpage(page + i); + BUG_ON(PageCompound(page)); + BUG_ON(!page_count(page)); + for (i = 1; i < (1 << order); i++) + set_page_refcounted(page + i); } /* @@ -795,14 +817,8 @@ again: put_cpu(); BUG_ON(bad_range(zone, page)); - if (prep_new_page(page, order)) + if (prep_new_page(page, order, gfp_flags)) goto again; - - if (gfp_flags & __GFP_ZERO) - prep_zero_page(page, order, gfp_flags); - - if (order && (gfp_flags & __GFP_COMP)) - prep_compound_page(page, order); return page; failed: @@ -926,7 +942,8 @@ restart: goto got_pg; do { - wakeup_kswapd(*z, order); + if (cpuset_zone_allowed(*z, gfp_mask)) + wakeup_kswapd(*z, order); } while (*(++z)); /* @@ -1183,7 +1200,7 @@ unsigned int nr_free_highpages (void) pg_data_t *pgdat; unsigned int pages = 0; - for_each_pgdat(pgdat) + for_each_online_pgdat(pgdat) pages += pgdat->node_zones[ZONE_HIGHMEM].free_pages; return pages; @@ -1214,24 +1231,22 @@ DEFINE_PER_CPU(long, nr_pagecache_local) = 0; static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask) { - int cpu = 0; + unsigned cpu; memset(ret, 0, nr * sizeof(unsigned long)); cpus_and(*cpumask, *cpumask, cpu_online_map); - cpu = first_cpu(*cpumask); - while (cpu < NR_CPUS) { - unsigned long *in, *out, off; - - if (!cpu_isset(cpu, *cpumask)) - continue; + for_each_cpu_mask(cpu, *cpumask) { + unsigned long *in; + unsigned long *out; + unsigned off; + unsigned next_cpu; in = (unsigned long *)&per_cpu(page_states, cpu); - cpu = next_cpu(cpu, *cpumask); - - if (likely(cpu < NR_CPUS)) - prefetch(&per_cpu(page_states, cpu)); + next_cpu = next_cpu(cpu, *cpumask); + if (likely(next_cpu < NR_CPUS)) + prefetch(&per_cpu(page_states, next_cpu)); out = (unsigned long *)ret; for (off = 0; off < nr; off++) @@ -1327,7 +1342,7 @@ void get_zone_counts(unsigned long *active, *active = 0; *inactive = 0; *free = 0; - for_each_pgdat(pgdat) { + for_each_online_pgdat(pgdat) { unsigned long l, m, n; __get_zone_counts(&l, &m, &n, pgdat); *active += l; @@ -1764,7 +1779,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, continue; page = pfn_to_page(pfn); set_page_links(page, zone, nid, pfn); - set_page_count(page, 1); + init_page_count(page); reset_page_mapcount(page); SetPageReserved(page); INIT_LIST_HEAD(&page->lru); @@ -2013,8 +2028,9 @@ static __meminit void zone_pcp_init(struct zone *zone) setup_pageset(zone_pcp(zone,cpu), batch); #endif } - printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n", - zone->name, zone->present_pages, batch); + if (zone->present_pages) + printk(KERN_DEBUG " %s zone: %lu pages, LIFO batch:%lu\n", + zone->name, zone->present_pages, batch); } static __meminit void init_currently_empty_zone(struct zone *zone, @@ -2025,7 +2041,6 @@ static __meminit void init_currently_empty_zone(struct zone *zone, zone_wait_table_init(zone, size); pgdat->nr_zones = zone_idx(zone) + 1; - zone->zone_mem_map = pfn_to_page(zone_start_pfn); zone->zone_start_pfn = zone_start_pfn; memmap_init(size, pgdat->node_id, zone_idx(zone), zone_start_pfn); @@ -2153,8 +2168,9 @@ static void *frag_start(struct seq_file *m, loff_t *pos) { pg_data_t *pgdat; loff_t node = *pos; - - for (pgdat = pgdat_list; pgdat && node; pgdat = pgdat->pgdat_next) + for (pgdat = first_online_pgdat(); + pgdat && node; + pgdat = next_online_pgdat(pgdat)) --node; return pgdat; @@ -2165,7 +2181,7 @@ static void *frag_next(struct seq_file *m, void *arg, loff_t *pos) pg_data_t *pgdat = (pg_data_t *)arg; (*pos)++; - return pgdat->pgdat_next; + return next_online_pgdat(pgdat); } static void frag_stop(struct seq_file *m, void *arg) @@ -2466,7 +2482,7 @@ static void setup_per_zone_lowmem_reserve(void) struct pglist_data *pgdat; int j, idx; - for_each_pgdat(pgdat) { + for_each_online_pgdat(pgdat) { for (j = 0; j < MAX_NR_ZONES; j++) { struct zone *zone = pgdat->node_zones + j; unsigned long present_pages = zone->present_pages; @@ -2685,8 +2701,7 @@ void *__init alloc_large_system_hash(const char *tablename, else numentries <<= (PAGE_SHIFT - scale); } - /* rounded up to nearest power of 2 in size */ - numentries = 1UL << (long_log2(numentries) + 1); + numentries = roundup_pow_of_two(numentries); /* limit allocation size to 1/16 total memory by default */ if (max == 0) { @@ -2729,3 +2744,44 @@ void *__init alloc_large_system_hash(const char *tablename, return table; } + +#ifdef CONFIG_OUT_OF_LINE_PFN_TO_PAGE +/* + * pfn <-> page translation. out-of-line version. + * (see asm-generic/memory_model.h) + */ +#if defined(CONFIG_FLATMEM) +struct page *pfn_to_page(unsigned long pfn) +{ + return mem_map + (pfn - ARCH_PFN_OFFSET); +} +unsigned long page_to_pfn(struct page *page) +{ + return (page - mem_map) + ARCH_PFN_OFFSET; +} +#elif defined(CONFIG_DISCONTIGMEM) +struct page *pfn_to_page(unsigned long pfn) +{ + int nid = arch_pfn_to_nid(pfn); + return NODE_DATA(nid)->node_mem_map + arch_local_page_offset(pfn,nid); +} +unsigned long page_to_pfn(struct page *page) +{ + struct pglist_data *pgdat = NODE_DATA(page_to_nid(page)); + return (page - pgdat->node_mem_map) + pgdat->node_start_pfn; +} +#elif defined(CONFIG_SPARSEMEM) +struct page *pfn_to_page(unsigned long pfn) +{ + return __section_mem_map_addr(__pfn_to_section(pfn)) + pfn; +} + +unsigned long page_to_pfn(struct page *page) +{ + long section_id = page_to_section(page); + return page - __section_mem_map_addr(__nr_to_section(section_id)); +} +#endif /* CONFIG_FLATMEM/DISCONTIGMME/SPARSEMEM */ +EXPORT_SYMBOL(pfn_to_page); +EXPORT_SYMBOL(page_to_pfn); +#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */ |