diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 613 |
1 files changed, 333 insertions, 280 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 5b74de6702e0..8fcced7823fa 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -58,6 +58,7 @@ #include <linux/prefetch.h> #include <linux/migrate.h> #include <linux/page-debug-flags.h> +#include <linux/sched/rt.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -90,6 +91,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = { #ifdef CONFIG_HIGHMEM [N_HIGH_MEMORY] = { { [0] = 1UL } }, #endif +#ifdef CONFIG_MOVABLE_NODE + [N_MEMORY] = { { [0] = 1UL } }, +#endif [N_CPU] = { { [0] = 1UL } }, #endif /* NUMA */ }; @@ -218,11 +222,6 @@ EXPORT_SYMBOL(nr_online_nodes); int page_group_by_mobility_disabled __read_mostly; -/* - * NOTE: - * Don't use set_pageblock_migratetype(page, MIGRATE_ISOLATE) directly. - * Instead, use {un}set_pageblock_isolate. - */ void set_pageblock_migratetype(struct page *page, int migratetype) { @@ -241,15 +240,20 @@ static int page_outside_zone_boundaries(struct zone *zone, struct page *page) int ret = 0; unsigned seq; unsigned long pfn = page_to_pfn(page); + unsigned long sp, start_pfn; do { seq = zone_span_seqbegin(zone); - if (pfn >= zone->zone_start_pfn + zone->spanned_pages) - ret = 1; - else if (pfn < zone->zone_start_pfn) + start_pfn = zone->zone_start_pfn; + sp = zone->spanned_pages; + if (!zone_spans_pfn(zone, pfn)) ret = 1; } while (zone_span_seqretry(zone, seq)); + if (ret) + pr_err("page %lu outside zone [ %lu - %lu ]\n", + pfn, start_pfn, start_pfn + sp); + return ret; } @@ -289,7 +293,7 @@ static void bad_page(struct page *page) /* Don't complain about poisoned pages */ if (PageHWPoison(page)) { - reset_page_mapcount(page); /* remove PageBuddy */ + page_mapcount_reset(page); /* remove PageBuddy */ return; } @@ -321,8 +325,8 @@ static void bad_page(struct page *page) dump_stack(); out: /* Leave bad fields for debug, except PageBuddy could make trouble */ - reset_page_mapcount(page); /* remove PageBuddy */ - add_taint(TAINT_BAD_PAGE); + page_mapcount_reset(page); /* remove PageBuddy */ + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); } /* @@ -368,8 +372,7 @@ static int destroy_compound_page(struct page *page, unsigned long order) int nr_pages = 1 << order; int bad = 0; - if (unlikely(compound_order(page) != order) || - unlikely(!PageHead(page))) { + if (unlikely(compound_order(page) != order)) { bad_page(page); bad++; } @@ -523,7 +526,7 @@ static inline int page_is_buddy(struct page *page, struct page *buddy, * If a block is freed, and its buddy is also free, then this * triggers coalescing into a block of larger size. * - * -- wli + * -- nyc */ static inline void __free_one_page(struct page *page, @@ -535,6 +538,8 @@ static inline void __free_one_page(struct page *page, unsigned long uninitialized_var(buddy_idx); struct page *buddy; + VM_BUG_ON(!zone_is_initialized(zone)); + if (unlikely(PageCompound(page))) if (unlikely(destroy_compound_page(page, order))) return; @@ -608,6 +613,7 @@ static inline int free_pages_check(struct page *page) bad_page(page); return 1; } + page_nid_reset_last(page); if (page->flags & PAGE_FLAGS_CHECK_AT_PREP) page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP; return 0; @@ -667,11 +673,13 @@ static void free_pcppages_bulk(struct zone *zone, int count, /* MIGRATE_MOVABLE list may include MIGRATE_RESERVEs */ __free_one_page(page, zone, 0, mt); trace_mm_page_pcpu_drain(page, 0, mt); - if (is_migrate_cma(mt)) - __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1); + if (likely(!is_migrate_isolate_page(page))) { + __mod_zone_page_state(zone, NR_FREE_PAGES, 1); + if (is_migrate_cma(mt)) + __mod_zone_page_state(zone, NR_FREE_CMA_PAGES, 1); + } } while (--to_free && --batch_free && !list_empty(list)); } - __mod_zone_page_state(zone, NR_FREE_PAGES, count); spin_unlock(&zone->lock); } @@ -683,7 +691,7 @@ static void free_one_page(struct zone *zone, struct page *page, int order, zone->pages_scanned = 0; __free_one_page(page, zone, order, migratetype); - if (unlikely(migratetype != MIGRATE_ISOLATE)) + if (unlikely(!is_migrate_isolate(migratetype))) __mod_zone_freepage_state(zone, 1 << order, migratetype); spin_unlock(&zone->lock); } @@ -730,6 +738,13 @@ static void __free_pages_ok(struct page *page, unsigned int order) local_irq_restore(flags); } +/* + * Read access to zone->managed_pages is safe because it's unsigned long, + * but we still need to serialize writers. Currently all callers of + * __free_pages_bootmem() except put_page_bootmem() should only be used + * at boot time. So for shorter boot time, we shift the burden to + * put_page_bootmem() to serialize writers. + */ void __meminit __free_pages_bootmem(struct page *page, unsigned int order) { unsigned int nr_pages = 1 << order; @@ -745,6 +760,7 @@ void __meminit __free_pages_bootmem(struct page *page, unsigned int order) set_page_count(p, 0); } + page_zone(page)->managed_pages += 1 << order; set_page_refcounted(page); __free_pages(page, order); } @@ -765,6 +781,10 @@ void __init init_cma_reserved_pageblock(struct page *page) set_pageblock_migratetype(page, MIGRATE_CMA); __free_pages(page, pageblock_order); totalram_pages += pageblock_nr_pages; +#ifdef CONFIG_HIGHMEM + if (PageHighMem(page)) + totalhigh_pages += pageblock_nr_pages; +#endif } #endif @@ -780,7 +800,7 @@ void __init init_cma_reserved_pageblock(struct page *page) * large block of memory acted on by a series of small allocations. * This behavior is a critical factor in sglist merging's success. * - * -- wli + * -- nyc */ static inline void expand(struct zone *zone, struct page *page, int low, int high, struct free_area *area, @@ -903,7 +923,9 @@ static int fallbacks[MIGRATE_TYPES][4] = { [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE, MIGRATE_RESERVE }, #endif [MIGRATE_RESERVE] = { MIGRATE_RESERVE }, /* Never used */ +#ifdef CONFIG_MEMORY_ISOLATION [MIGRATE_ISOLATE] = { MIGRATE_RESERVE }, /* Never used */ +#endif }; /* @@ -968,9 +990,9 @@ int move_freepages_block(struct zone *zone, struct page *page, end_pfn = start_pfn + pageblock_nr_pages - 1; /* Do not cross zone boundaries */ - if (start_pfn < zone->zone_start_pfn) + if (!zone_spans_pfn(zone, start_pfn)) start_page = page; - if (end_pfn >= zone->zone_start_pfn + zone->spanned_pages) + if (!zone_spans_pfn(zone, end_pfn)) return 0; return move_freepages(zone, start_page, end_page, migratetype); @@ -1129,7 +1151,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order, list_add_tail(&page->lru, list); if (IS_ENABLED(CONFIG_CMA)) { mt = get_pageblock_migratetype(page); - if (!is_migrate_cma(mt) && mt != MIGRATE_ISOLATE) + if (!is_migrate_cma(mt) && !is_migrate_isolate(mt)) mt = migratetype; } set_freepage_migratetype(page, mt); @@ -1264,7 +1286,7 @@ void mark_free_pages(struct zone *zone) spin_lock_irqsave(&zone->lock, flags); - max_zone_pfn = zone->zone_start_pfn + zone->spanned_pages; + max_zone_pfn = zone_end_pfn(zone); for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) if (pfn_valid(pfn)) { struct page *page = pfn_to_page(pfn); @@ -1313,7 +1335,7 @@ void free_hot_cold_page(struct page *page, int cold) * excessively into the page allocator */ if (migratetype >= MIGRATE_PCPTYPES) { - if (unlikely(migratetype == MIGRATE_ISOLATE)) { + if (unlikely(is_migrate_isolate(migratetype))) { free_one_page(zone, page, 0, migratetype); goto out; } @@ -1376,14 +1398,8 @@ void split_page(struct page *page, unsigned int order) set_page_refcounted(page + i); } -/* - * Similar to the split_page family of functions except that the page - * required at the given order and being isolated now to prevent races - * with parallel allocators - */ -int capture_free_page(struct page *page, int alloc_order, int migratetype) +static int __isolate_free_page(struct page *page, unsigned int order) { - unsigned int order; unsigned long watermark; struct zone *zone; int mt; @@ -1391,32 +1407,28 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype) BUG_ON(!PageBuddy(page)); zone = page_zone(page); - order = page_order(page); + mt = get_pageblock_migratetype(page); - /* Obey watermarks as if the page was being allocated */ - watermark = low_wmark_pages(zone) + (1 << order); - if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) - return 0; + if (!is_migrate_isolate(mt)) { + /* Obey watermarks as if the page was being allocated */ + watermark = low_wmark_pages(zone) + (1 << order); + if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) + return 0; + + __mod_zone_freepage_state(zone, -(1UL << order), mt); + } /* Remove page from free list */ list_del(&page->lru); zone->free_area[order].nr_free--; rmv_page_order(page); - mt = get_pageblock_migratetype(page); - if (unlikely(mt != MIGRATE_ISOLATE)) - __mod_zone_freepage_state(zone, -(1UL << order), mt); - - if (alloc_order != order) - expand(zone, page, alloc_order, order, - &zone->free_area[order], migratetype); - - /* Set the pageblock if the captured page is at least a pageblock */ + /* Set the pageblock if the isolated page is at least a pageblock */ if (order >= pageblock_order - 1) { struct page *endpage = page + (1 << order) - 1; for (; page < endpage; page += pageblock_nr_pages) { int mt = get_pageblock_migratetype(page); - if (mt != MIGRATE_ISOLATE && !is_migrate_cma(mt)) + if (!is_migrate_isolate(mt) && !is_migrate_cma(mt)) set_pageblock_migratetype(page, MIGRATE_MOVABLE); } @@ -1440,10 +1452,9 @@ int split_free_page(struct page *page) unsigned int order; int nr_pages; - BUG_ON(!PageBuddy(page)); order = page_order(page); - nr_pages = capture_free_page(page, order, 0); + nr_pages = __isolate_free_page(page, order); if (!nr_pages) return 0; @@ -1641,20 +1652,6 @@ static bool __zone_watermark_ok(struct zone *z, int order, unsigned long mark, return true; } -#ifdef CONFIG_MEMORY_ISOLATION -static inline unsigned long nr_zone_isolate_freepages(struct zone *zone) -{ - if (unlikely(zone->nr_pageblock_isolate)) - return zone->nr_pageblock_isolate * pageblock_nr_pages; - return 0; -} -#else -static inline unsigned long nr_zone_isolate_freepages(struct zone *zone) -{ - return 0; -} -#endif - bool zone_watermark_ok(struct zone *z, int order, unsigned long mark, int classzone_idx, int alloc_flags) { @@ -1670,14 +1667,6 @@ bool zone_watermark_ok_safe(struct zone *z, int order, unsigned long mark, if (z->percpu_drift_mark && free_pages < z->percpu_drift_mark) free_pages = zone_page_state_snapshot(z, NR_FREE_PAGES); - /* - * If the zone has MIGRATE_ISOLATE type free pages, we should consider - * it. nr_zone_isolate_freepages is never accurate so kswapd might not - * sleep although it could do so. But this is more desirable for memory - * hotplug than sleeping which can cause a livelock in the direct - * reclaim path. - */ - free_pages -= nr_zone_isolate_freepages(z); return __zone_watermark_ok(z, order, mark, classzone_idx, alloc_flags, free_pages); } @@ -1692,7 +1681,7 @@ bool zone_watermark_ok_safe(struct zone *z, int order, unsigned long mark, * * If the zonelist cache is present in the passed in zonelist, then * returns a pointer to the allowed node mask (either the current - * tasks mems_allowed, or node_states[N_HIGH_MEMORY].) + * tasks mems_allowed, or node_states[N_MEMORY].) * * If the zonelist cache is not available for this zonelist, does * nothing and returns NULL. @@ -1721,7 +1710,7 @@ static nodemask_t *zlc_setup(struct zonelist *zonelist, int alloc_flags) allowednodes = !in_interrupt() && (alloc_flags & ALLOC_CPUSET) ? &cpuset_current_mems_allowed : - &node_states[N_HIGH_MEMORY]; + &node_states[N_MEMORY]; return allowednodes; } @@ -1871,7 +1860,7 @@ zonelist_scan: */ for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx, nodemask) { - if (NUMA_BUILD && zlc_active && + if (IS_ENABLED(CONFIG_NUMA) && zlc_active && !zlc_zone_worth_trying(zonelist, z, allowednodes)) continue; if ((alloc_flags & ALLOC_CPUSET) && @@ -1917,7 +1906,8 @@ zonelist_scan: classzone_idx, alloc_flags)) goto try_this_zone; - if (NUMA_BUILD && !did_zlc_setup && nr_online_nodes > 1) { + if (IS_ENABLED(CONFIG_NUMA) && + !did_zlc_setup && nr_online_nodes > 1) { /* * we do zlc_setup if there are multiple nodes * and before considering the first zone allowed @@ -1936,7 +1926,7 @@ zonelist_scan: * As we may have just activated ZLC, check if the first * eligible zone has failed zone_reclaim recently. */ - if (NUMA_BUILD && zlc_active && + if (IS_ENABLED(CONFIG_NUMA) && zlc_active && !zlc_zone_worth_trying(zonelist, z, allowednodes)) continue; @@ -1962,11 +1952,11 @@ try_this_zone: if (page) break; this_zone_full: - if (NUMA_BUILD) + if (IS_ENABLED(CONFIG_NUMA)) zlc_mark_zone_full(zonelist, z); } - if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) { + if (unlikely(IS_ENABLED(CONFIG_NUMA) && page == NULL && zlc_active)) { /* Disable zlc cache for second zonelist scan */ zlc_active = 0; goto zonelist_scan; @@ -2148,8 +2138,6 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, bool *contended_compaction, bool *deferred_compaction, unsigned long *did_some_progress) { - struct page *page = NULL; - if (!order) return NULL; @@ -2161,16 +2149,12 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, current->flags |= PF_MEMALLOC; *did_some_progress = try_to_compact_pages(zonelist, order, gfp_mask, nodemask, sync_migration, - contended_compaction, &page); + contended_compaction); current->flags &= ~PF_MEMALLOC; - /* If compaction captured a page, prep and use it */ - if (page) { - prep_new_page(page, order, gfp_mask); - goto got_page; - } - if (*did_some_progress != COMPACT_SKIPPED) { + struct page *page; + /* Page migration frees to the PCP lists but we want merging */ drain_pages(get_cpu()); put_cpu(); @@ -2180,7 +2164,6 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order, alloc_flags & ~ALLOC_NO_WATERMARKS, preferred_zone, migratetype); if (page) { -got_page: preferred_zone->compact_blockskip_flush = false; preferred_zone->compact_considered = 0; preferred_zone->compact_defer_shift = 0; @@ -2266,7 +2249,7 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order, return NULL; /* After successful reclaim, reconsider all zones for allocation */ - if (NUMA_BUILD) + if (IS_ENABLED(CONFIG_NUMA)) zlc_clear_zones_full(zonelist); retry: @@ -2412,12 +2395,14 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, * allowed per node queues are empty and that nodes are * over allocated. */ - if (NUMA_BUILD && (gfp_mask & GFP_THISNODE) == GFP_THISNODE) + if (IS_ENABLED(CONFIG_NUMA) && + (gfp_mask & GFP_THISNODE) == GFP_THISNODE) goto nopage; restart: - wake_all_kswapd(order, zonelist, high_zoneidx, - zone_idx(preferred_zone)); + if (!(gfp_mask & __GFP_NO_KSWAPD)) + wake_all_kswapd(order, zonelist, high_zoneidx, + zone_idx(preferred_zone)); /* * OK, we're below the kswapd watermark and have kicked background @@ -2494,7 +2479,7 @@ rebalance: * system then fail the allocation instead of entering direct reclaim. */ if ((deferred_compaction || contended_compaction) && - (gfp_mask & (__GFP_MOVABLE|__GFP_REPEAT)) == __GFP_MOVABLE) + (gfp_mask & __GFP_NO_KSWAPD)) goto nopage; /* Try direct reclaim and then allocating */ @@ -2595,6 +2580,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int migratetype = allocflags_to_migratetype(gfp_mask); unsigned int cpuset_mems_cookie; int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET; + struct mem_cgroup *memcg = NULL; gfp_mask &= gfp_allowed_mask; @@ -2613,6 +2599,13 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, if (unlikely(!zonelist->_zonerefs->zone)) return NULL; + /* + * Will only have any effect when __GFP_KMEMCG is set. This is + * verified in the (always inline) callee + */ + if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order)) + return NULL; + retry_cpuset: cpuset_mems_cookie = get_mems_allowed(); @@ -2631,10 +2624,17 @@ retry_cpuset: page = get_page_from_freelist(gfp_mask|__GFP_HARDWALL, nodemask, order, zonelist, high_zoneidx, alloc_flags, preferred_zone, migratetype); - if (unlikely(!page)) + if (unlikely(!page)) { + /* + * Runtime PM, block IO and its error handling path + * can deadlock because I/O on the device might not + * complete. + */ + gfp_mask = memalloc_noio_flags(gfp_mask); page = __alloc_pages_slowpath(gfp_mask, order, zonelist, high_zoneidx, nodemask, preferred_zone, migratetype); + } trace_mm_page_alloc(page, order, gfp_mask, migratetype); @@ -2648,6 +2648,8 @@ out: if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page)) goto retry_cpuset; + memcg_kmem_commit_charge(page, memcg, order); + return page; } EXPORT_SYMBOL(__alloc_pages_nodemask); @@ -2700,6 +2702,31 @@ void free_pages(unsigned long addr, unsigned int order) EXPORT_SYMBOL(free_pages); +/* + * __free_memcg_kmem_pages and free_memcg_kmem_pages will free + * pages allocated with __GFP_KMEMCG. + * + * Those pages are accounted to a particular memcg, embedded in the + * corresponding page_cgroup. To avoid adding a hit in the allocator to search + * for that information only to find out that it is NULL for users who have no + * interest in that whatsoever, we provide these functions. + * + * The caller knows better which flags it relies on. + */ +void __free_memcg_kmem_pages(struct page *page, unsigned int order) +{ + memcg_kmem_uncharge_pages(page, order); + __free_pages(page, order); +} + +void free_memcg_kmem_pages(unsigned long addr, unsigned int order) +{ + if (addr != 0) { + VM_BUG_ON(!virt_addr_valid((void *)addr)); + __free_memcg_kmem_pages(virt_to_page((void *)addr), order); + } +} + static void *make_alloc_exact(unsigned long addr, unsigned order, size_t size) { if (addr) { @@ -2779,18 +2806,27 @@ void free_pages_exact(void *virt, size_t size) } EXPORT_SYMBOL(free_pages_exact); -static unsigned int nr_free_zone_pages(int offset) +/** + * nr_free_zone_pages - count number of pages beyond high watermark + * @offset: The zone index of the highest zone + * + * nr_free_zone_pages() counts the number of counts pages which are beyond the + * high watermark within all zones at or below a given zone index. For each + * zone, the number of pages is calculated as: + * present_pages - high_pages + */ +static unsigned long nr_free_zone_pages(int offset) { struct zoneref *z; struct zone *zone; /* Just pick one node, since fallback list is circular */ - unsigned int sum = 0; + unsigned long sum = 0; struct zonelist *zonelist = node_zonelist(numa_node_id(), GFP_KERNEL); for_each_zone_zonelist(zone, z, zonelist, offset) { - unsigned long size = zone->present_pages; + unsigned long size = zone->managed_pages; unsigned long high = high_wmark_pages(zone); if (size > high) sum += size - high; @@ -2799,26 +2835,32 @@ static unsigned int nr_free_zone_pages(int offset) return sum; } -/* - * Amount of free RAM allocatable within ZONE_DMA and ZONE_NORMAL +/** + * nr_free_buffer_pages - count number of pages beyond high watermark + * + * nr_free_buffer_pages() counts the number of pages which are beyond the high + * watermark within ZONE_DMA and ZONE_NORMAL. */ -unsigned int nr_free_buffer_pages(void) +unsigned long nr_free_buffer_pages(void) { return nr_free_zone_pages(gfp_zone(GFP_USER)); } EXPORT_SYMBOL_GPL(nr_free_buffer_pages); -/* - * Amount of free RAM allocatable within all zones +/** + * nr_free_pagecache_pages - count number of pages beyond high watermark + * + * nr_free_pagecache_pages() counts the number of pages which are beyond the + * high watermark within all zones. */ -unsigned int nr_free_pagecache_pages(void) +unsigned long nr_free_pagecache_pages(void) { return nr_free_zone_pages(gfp_zone(GFP_HIGHUSER_MOVABLE)); } static inline void show_node(struct zone *zone) { - if (NUMA_BUILD) + if (IS_ENABLED(CONFIG_NUMA)) printk("Node %d ", zone_to_nid(zone)); } @@ -2843,7 +2885,7 @@ void si_meminfo_node(struct sysinfo *val, int nid) val->totalram = pgdat->node_present_pages; val->freeram = node_page_state(nid, NR_FREE_PAGES); #ifdef CONFIG_HIGHMEM - val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].present_pages; + val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; val->freehigh = zone_page_state(&pgdat->node_zones[ZONE_HIGHMEM], NR_FREE_PAGES); #else @@ -2876,6 +2918,33 @@ out: #define K(x) ((x) << (PAGE_SHIFT-10)) +static void show_migration_types(unsigned char type) +{ + static const char types[MIGRATE_TYPES] = { + [MIGRATE_UNMOVABLE] = 'U', + [MIGRATE_RECLAIMABLE] = 'E', + [MIGRATE_MOVABLE] = 'M', + [MIGRATE_RESERVE] = 'R', +#ifdef CONFIG_CMA + [MIGRATE_CMA] = 'C', +#endif +#ifdef CONFIG_MEMORY_ISOLATION + [MIGRATE_ISOLATE] = 'I', +#endif + }; + char tmp[MIGRATE_TYPES + 1]; + char *p = tmp; + int i; + + for (i = 0; i < MIGRATE_TYPES; i++) { + if (type & (1 << i)) + *p++ = types[i]; + } + + *p = '\0'; + printk("(%s) ", tmp); +} + /* * Show free area list (used inside shift_scroll-lock stuff) * We also calculate the percentage fragmentation. We do this by counting the @@ -2950,6 +3019,7 @@ void show_free_areas(unsigned int filter) " isolated(anon):%lukB" " isolated(file):%lukB" " present:%lukB" + " managed:%lukB" " mlocked:%lukB" " dirty:%lukB" " writeback:%lukB" @@ -2979,6 +3049,7 @@ void show_free_areas(unsigned int filter) K(zone_page_state(zone, NR_ISOLATED_ANON)), K(zone_page_state(zone, NR_ISOLATED_FILE)), K(zone->present_pages), + K(zone->managed_pages), K(zone_page_state(zone, NR_MLOCK)), K(zone_page_state(zone, NR_FILE_DIRTY)), K(zone_page_state(zone, NR_WRITEBACK)), @@ -3004,6 +3075,7 @@ void show_free_areas(unsigned int filter) for_each_populated_zone(zone) { unsigned long nr[MAX_ORDER], flags, order, total = 0; + unsigned char types[MAX_ORDER]; if (skip_free_areas_node(filter, zone_to_nid(zone))) continue; @@ -3012,12 +3084,24 @@ void show_free_areas(unsigned int filter) spin_lock_irqsave(&zone->lock, flags); for (order = 0; order < MAX_ORDER; order++) { - nr[order] = zone->free_area[order].nr_free; + struct free_area *area = &zone->free_area[order]; + int type; + + nr[order] = area->nr_free; total += nr[order] << order; + + types[order] = 0; + for (type = 0; type < MIGRATE_TYPES; type++) { + if (!list_empty(&area->free_list[type])) + types[order] |= 1 << type; + } } spin_unlock_irqrestore(&zone->lock, flags); - for (order = 0; order < MAX_ORDER; order++) + for (order = 0; order < MAX_ORDER; order++) { printk("%lu*%lukB ", nr[order], K(1UL) << order); + if (nr[order]) + show_migration_types(types[order]); + } printk("= %lukB\n", K(total)); } @@ -3185,7 +3269,7 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask) { int n, val; int min_val = INT_MAX; - int best_node = -1; + int best_node = NUMA_NO_NODE; const struct cpumask *tmp = cpumask_of_node(0); /* Use the local node if we haven't already */ @@ -3194,7 +3278,7 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask) return node; } - for_each_node_state(n, N_HIGH_MEMORY) { + for_each_node_state(n, N_MEMORY) { /* Don't want a node to appear more than once */ if (node_isset(n, *used_node_mask)) @@ -3336,7 +3420,7 @@ static int default_zonelist_order(void) * local memory, NODE_ORDER may be suitable. */ average_size = total_size / - (nodes_weight(node_states[N_HIGH_MEMORY]) + 1); + (nodes_weight(node_states[N_MEMORY]) + 1); for_each_online_node(nid) { low_kmem_size = 0; total_size = 0; @@ -3729,7 +3813,7 @@ static void setup_zone_migrate_reserve(struct zone *zone) * the block. */ start_pfn = zone->zone_start_pfn; - end_pfn = start_pfn + zone->spanned_pages; + end_pfn = zone_end_pfn(zone); start_pfn = roundup(start_pfn, pageblock_nr_pages); reserve = roundup(min_wmark_pages(zone), pageblock_nr_pages) >> pageblock_order; @@ -3825,7 +3909,8 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, set_page_links(page, zone, nid, pfn); mminit_verify_page_links(page, zone, nid, pfn); init_page_count(page); - reset_page_mapcount(page); + page_mapcount_reset(page); + page_nid_reset_last(page); SetPageReserved(page); /* * Mark the block movable so that blocks are reserved for @@ -3842,7 +3927,7 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, * pfn out of zone. */ if ((z->zone_start_pfn <= pfn) - && (pfn < z->zone_start_pfn + z->spanned_pages) + && (pfn < zone_end_pfn(z)) && !(pfn & (pageblock_nr_pages - 1))) set_pageblock_migratetype(page, MIGRATE_MOVABLE); @@ -3880,7 +3965,7 @@ static int __meminit zone_batchsize(struct zone *zone) * * OK, so we don't know how big the cache is. So guess. */ - batch = zone->present_pages / 1024; + batch = zone->managed_pages / 1024; if (batch * PAGE_SIZE > 512 * 1024) batch = (512 * 1024) / PAGE_SIZE; batch /= 4; /* We effectively *= 4 below */ @@ -3964,7 +4049,7 @@ static void __meminit setup_zone_pageset(struct zone *zone) if (percpu_pagelist_fraction) setup_pagelist_highmark(pcp, - (zone->present_pages / + (zone->managed_pages / percpu_pagelist_fraction)); } } @@ -4369,10 +4454,11 @@ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, * round what is now in bits to nearest long in bits, then return it in * bytes. */ -static unsigned long __init usemap_size(unsigned long zonesize) +static unsigned long __init usemap_size(unsigned long zone_start_pfn, unsigned long zonesize) { unsigned long usemapsize; + zonesize += zone_start_pfn & (pageblock_nr_pages-1); usemapsize = roundup(zonesize, pageblock_nr_pages); usemapsize = usemapsize >> pageblock_order; usemapsize *= NR_PAGEBLOCK_BITS; @@ -4382,17 +4468,19 @@ static unsigned long __init usemap_size(unsigned long zonesize) } static void __init setup_usemap(struct pglist_data *pgdat, - struct zone *zone, unsigned long zonesize) + struct zone *zone, + unsigned long zone_start_pfn, + unsigned long zonesize) { - unsigned long usemapsize = usemap_size(zonesize); + unsigned long usemapsize = usemap_size(zone_start_pfn, zonesize); zone->pageblock_flags = NULL; if (usemapsize) zone->pageblock_flags = alloc_bootmem_node_nopanic(pgdat, usemapsize); } #else -static inline void setup_usemap(struct pglist_data *pgdat, - struct zone *zone, unsigned long zonesize) {} +static inline void setup_usemap(struct pglist_data *pgdat, struct zone *zone, + unsigned long zone_start_pfn, unsigned long zonesize) {} #endif /* CONFIG_SPARSEMEM */ #ifdef CONFIG_HUGETLB_PAGE_SIZE_VARIABLE @@ -4432,6 +4520,26 @@ void __init set_pageblock_order(void) #endif /* CONFIG_HUGETLB_PAGE_SIZE_VARIABLE */ +static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, + unsigned long present_pages) +{ + unsigned long pages = spanned_pages; + + /* + * Provide a more accurate estimation if there are holes within + * the zone and SPARSEMEM is in use. If there are holes within the + * zone, each populated memory region may cost us one or two extra + * memmap pages due to alignment because memmap pages for each + * populated regions may not naturally algined on page boundary. + * So the (present_pages >> 4) heuristic is a tradeoff for that. + */ + if (spanned_pages > present_pages + (present_pages >> 4) && + IS_ENABLED(CONFIG_SPARSEMEM)) + pages = present_pages; + + return PAGE_ALIGN(pages * sizeof(struct page)) >> PAGE_SHIFT; +} + /* * Set up the zone data structures: * - mark all pages reserved @@ -4449,54 +4557,67 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat, int ret; pgdat_resize_init(pgdat); +#ifdef CONFIG_NUMA_BALANCING + spin_lock_init(&pgdat->numabalancing_migrate_lock); + pgdat->numabalancing_migrate_nr_pages = 0; + pgdat->numabalancing_migrate_next_window = jiffies; +#endif init_waitqueue_head(&pgdat->kswapd_wait); init_waitqueue_head(&pgdat->pfmemalloc_wait); pgdat_page_cgroup_init(pgdat); for (j = 0; j < MAX_NR_ZONES; j++) { struct zone *zone = pgdat->node_zones + j; - unsigned long size, realsize, memmap_pages; + unsigned long size, realsize, freesize, memmap_pages; size = zone_spanned_pages_in_node(nid, j, zones_size); - realsize = size - zone_absent_pages_in_node(nid, j, + realsize = freesize = size - zone_absent_pages_in_node(nid, j, zholes_size); /* - * Adjust realsize so that it accounts for how much memory + * Adjust freesize so that it accounts for how much memory * is used by this zone for memmap. This affects the watermark * and per-cpu initialisations */ - memmap_pages = - PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT; - if (realsize >= memmap_pages) { - realsize -= memmap_pages; + memmap_pages = calc_memmap_size(size, realsize); + if (freesize >= memmap_pages) { + freesize -= memmap_pages; if (memmap_pages) printk(KERN_DEBUG " %s zone: %lu pages used for memmap\n", zone_names[j], memmap_pages); } else printk(KERN_WARNING - " %s zone: %lu pages exceeds realsize %lu\n", - zone_names[j], memmap_pages, realsize); + " %s zone: %lu pages exceeds freesize %lu\n", + zone_names[j], memmap_pages, freesize); /* Account for reserved pages */ - if (j == 0 && realsize > dma_reserve) { - realsize -= dma_reserve; + if (j == 0 && freesize > dma_reserve) { + freesize -= dma_reserve; printk(KERN_DEBUG " %s zone: %lu pages reserved\n", zone_names[0], dma_reserve); } if (!is_highmem_idx(j)) - nr_kernel_pages += realsize; - nr_all_pages += realsize; + nr_kernel_pages += freesize; + /* Charge for highmem memmap if there are enough kernel pages */ + else if (nr_kernel_pages > memmap_pages * 2) + nr_kernel_pages -= memmap_pages; + nr_all_pages += freesize; zone->spanned_pages = size; zone->present_pages = realsize; + /* + * Set an approximate value for lowmem here, it will be adjusted + * when the bootmem allocator frees pages into the buddy system. + * And all highmem pages will be managed by the buddy system. + */ + zone->managed_pages = is_highmem_idx(j) ? realsize : freesize; #ifdef CONFIG_NUMA zone->node = nid; - zone->min_unmapped_pages = (realsize*sysctl_min_unmapped_ratio) + zone->min_unmapped_pages = (freesize*sysctl_min_unmapped_ratio) / 100; - zone->min_slab_pages = (realsize * sysctl_min_slab_ratio) / 100; + zone->min_slab_pages = (freesize * sysctl_min_slab_ratio) / 100; #endif zone->name = zone_names[j]; spin_lock_init(&zone->lock); @@ -4505,12 +4626,12 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat, zone->zone_pgdat = pgdat; zone_pcp_init(zone); - lruvec_init(&zone->lruvec, zone); + lruvec_init(&zone->lruvec); if (!size) continue; set_pageblock_order(); - setup_usemap(pgdat, zone, size); + setup_usemap(pgdat, zone, zone_start_pfn, size); ret = init_currently_empty_zone(zone, zone_start_pfn, size, MEMMAP_EARLY); BUG_ON(ret); @@ -4537,7 +4658,7 @@ static void __init_refok alloc_node_mem_map(struct pglist_data *pgdat) * for the buddy allocator to function correctly. */ start = pgdat->node_start_pfn & ~(MAX_ORDER_NR_PAGES - 1); - end = pgdat->node_start_pfn + pgdat->node_spanned_pages; + end = pgdat_end_pfn(pgdat); end = ALIGN(end, MAX_ORDER_NR_PAGES); size = (end - start) * sizeof(struct page); map = alloc_remap(pgdat->node_id, size); @@ -4687,7 +4808,7 @@ unsigned long __init find_min_pfn_with_active_regions(void) /* * early_calculate_totalpages() * Sum pages in active regions for movable zone. - * Populate N_HIGH_MEMORY for calculating usable_nodes. + * Populate N_MEMORY for calculating usable_nodes. */ static unsigned long __init early_calculate_totalpages(void) { @@ -4700,7 +4821,7 @@ static unsigned long __init early_calculate_totalpages(void) totalpages += pages; if (pages) - node_set_state(nid, N_HIGH_MEMORY); + node_set_state(nid, N_MEMORY); } return totalpages; } @@ -4717,9 +4838,9 @@ static void __init find_zone_movable_pfns_for_nodes(void) unsigned long usable_startpfn; unsigned long kernelcore_node, kernelcore_remaining; /* save the state before borrow the nodemask */ - nodemask_t saved_node_state = node_states[N_HIGH_MEMORY]; + nodemask_t saved_node_state = node_states[N_MEMORY]; unsigned long totalpages = early_calculate_totalpages(); - int usable_nodes = nodes_weight(node_states[N_HIGH_MEMORY]); + int usable_nodes = nodes_weight(node_states[N_MEMORY]); /* * If movablecore was specified, calculate what size of @@ -4754,7 +4875,7 @@ static void __init find_zone_movable_pfns_for_nodes(void) restart: /* Spread kernelcore memory as evenly as possible throughout nodes */ kernelcore_node = required_kernelcore / usable_nodes; - for_each_node_state(nid, N_HIGH_MEMORY) { + for_each_node_state(nid, N_MEMORY) { unsigned long start_pfn, end_pfn; /* @@ -4846,23 +4967,27 @@ restart: out: /* restore the node_state */ - node_states[N_HIGH_MEMORY] = saved_node_state; + node_states[N_MEMORY] = saved_node_state; } -/* Any regular memory on that node ? */ -static void __init check_for_regular_memory(pg_data_t *pgdat) +/* Any regular or high memory on that node ? */ +static void check_for_memory(pg_data_t *pgdat, int nid) { -#ifdef CONFIG_HIGHMEM enum zone_type zone_type; - for (zone_type = 0; zone_type <= ZONE_NORMAL; zone_type++) { + if (N_MEMORY == N_NORMAL_MEMORY) + return; + + for (zone_type = 0; zone_type <= ZONE_MOVABLE - 1; zone_type++) { struct zone *zone = &pgdat->node_zones[zone_type]; if (zone->present_pages) { - node_set_state(zone_to_nid(zone), N_NORMAL_MEMORY); + node_set_state(nid, N_HIGH_MEMORY); + if (N_NORMAL_MEMORY != N_HIGH_MEMORY && + zone_type <= ZONE_NORMAL) + node_set_state(nid, N_NORMAL_MEMORY); break; } } -#endif } /** @@ -4945,8 +5070,8 @@ void __init free_area_init_nodes(unsigned long *max_zone_pfn) /* Any memory on that node */ if (pgdat->node_present_pages) - node_set_state(nid, N_HIGH_MEMORY); - check_for_regular_memory(pgdat); + node_set_state(nid, N_MEMORY); + check_for_memory(pgdat, nid); } } @@ -5068,8 +5193,8 @@ static void calculate_totalreserve_pages(void) /* we treat the high watermark as reserved pages. */ max += high_wmark_pages(zone); - if (max > zone->present_pages) - max = zone->present_pages; + if (max > zone->managed_pages) + max = zone->managed_pages; reserve_pages += max; /* * Lowmem reserves are not available to @@ -5101,7 +5226,7 @@ static void setup_per_zone_lowmem_reserve(void) 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; + unsigned long managed_pages = zone->managed_pages; zone->lowmem_reserve[j] = 0; @@ -5115,9 +5240,9 @@ static void setup_per_zone_lowmem_reserve(void) sysctl_lowmem_reserve_ratio[idx] = 1; lower_zone = pgdat->node_zones + idx; - lower_zone->lowmem_reserve[j] = present_pages / + lower_zone->lowmem_reserve[j] = managed_pages / sysctl_lowmem_reserve_ratio[idx]; - present_pages += lower_zone->present_pages; + managed_pages += lower_zone->managed_pages; } } } @@ -5136,14 +5261,14 @@ static void __setup_per_zone_wmarks(void) /* Calculate total number of !ZONE_HIGHMEM pages */ for_each_zone(zone) { if (!is_highmem(zone)) - lowmem_pages += zone->present_pages; + lowmem_pages += zone->managed_pages; } for_each_zone(zone) { u64 tmp; spin_lock_irqsave(&zone->lock, flags); - tmp = (u64)pages_min * zone->present_pages; + tmp = (u64)pages_min * zone->managed_pages; do_div(tmp, lowmem_pages); if (is_highmem(zone)) { /* @@ -5155,13 +5280,10 @@ static void __setup_per_zone_wmarks(void) * deltas controls asynch page reclaim, and so should * not be capped for highmem. */ - int min_pages; + unsigned long min_pages; - min_pages = zone->present_pages / 1024; - if (min_pages < SWAP_CLUSTER_MAX) - min_pages = SWAP_CLUSTER_MAX; - if (min_pages > 128) - min_pages = 128; + min_pages = zone->managed_pages / 1024; + min_pages = clamp(min_pages, SWAP_CLUSTER_MAX, 128UL); zone->watermark[WMARK_MIN] = min_pages; } else { /* @@ -5174,10 +5296,6 @@ static void __setup_per_zone_wmarks(void) zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); - zone->watermark[WMARK_MIN] += cma_wmark_pages(zone); - zone->watermark[WMARK_LOW] += cma_wmark_pages(zone); - zone->watermark[WMARK_HIGH] += cma_wmark_pages(zone); - setup_zone_migrate_reserve(zone); spin_unlock_irqrestore(&zone->lock, flags); } @@ -5226,7 +5344,7 @@ static void __meminit calculate_zone_inactive_ratio(struct zone *zone) unsigned int gb, ratio; /* Zone size in gigabytes */ - gb = zone->present_pages >> (30 - PAGE_SHIFT); + gb = zone->managed_pages >> (30 - PAGE_SHIFT); if (gb) ratio = int_sqrt(10 * gb); else @@ -5312,7 +5430,7 @@ int sysctl_min_unmapped_ratio_sysctl_handler(ctl_table *table, int write, return rc; for_each_zone(zone) - zone->min_unmapped_pages = (zone->present_pages * + zone->min_unmapped_pages = (zone->managed_pages * sysctl_min_unmapped_ratio) / 100; return 0; } @@ -5328,7 +5446,7 @@ int sysctl_min_slab_ratio_sysctl_handler(ctl_table *table, int write, return rc; for_each_zone(zone) - zone->min_slab_pages = (zone->present_pages * + zone->min_slab_pages = (zone->managed_pages * sysctl_min_slab_ratio) / 100; return 0; } @@ -5370,7 +5488,7 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, for_each_populated_zone(zone) { for_each_possible_cpu(cpu) { unsigned long high; - high = zone->present_pages / percpu_pagelist_fraction; + high = zone->managed_pages / percpu_pagelist_fraction; setup_pagelist_highmark( per_cpu_ptr(zone->pageset, cpu), high); } @@ -5505,7 +5623,7 @@ static inline int pfn_to_bitidx(struct zone *zone, unsigned long pfn) pfn &= (PAGES_PER_SECTION-1); return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; #else - pfn = pfn - zone->zone_start_pfn; + pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages); return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS; #endif /* CONFIG_SPARSEMEM */ } @@ -5557,8 +5675,7 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags, pfn = page_to_pfn(page); bitmap = get_pageblock_bitmap(zone, pfn); bitidx = pfn_to_bitidx(zone, pfn); - VM_BUG_ON(pfn < zone->zone_start_pfn); - VM_BUG_ON(pfn >= zone->zone_start_pfn + zone->spanned_pages); + VM_BUG_ON(!zone_spans_pfn(zone, pfn)); for (; start_bitidx <= end_bitidx; start_bitidx++, value <<= 1) if (flags & value) @@ -5575,7 +5692,8 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags, * MIGRATE_MOVABLE block might include unmovable pages. It means you can't * expect this function should be exact. */ -bool has_unmovable_pages(struct zone *zone, struct page *page, int count) +bool has_unmovable_pages(struct zone *zone, struct page *page, int count, + bool skip_hwpoisoned_pages) { unsigned long pfn, iter, found; int mt; @@ -5610,6 +5728,13 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count) continue; } + /* + * The HWPoisoned page may be not in buddy system, and + * page_count() is not 0. + */ + if (skip_hwpoisoned_pages && PageHWPoison(page)) + continue; + if (!PageLRU(page)) found++; /* @@ -5648,11 +5773,10 @@ bool is_pageblock_removable_nolock(struct page *page) zone = page_zone(page); pfn = page_to_pfn(page); - if (zone->zone_start_pfn > pfn || - zone->zone_start_pfn + zone->spanned_pages <= pfn) + if (!zone_spans_pfn(zone, pfn)) return false; - return !has_unmovable_pages(zone, page, 0); + return !has_unmovable_pages(zone, page, 0, true); } #ifdef CONFIG_CMA @@ -5679,7 +5803,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc, unsigned int tries = 0; int ret = 0; - migrate_prep_local(); + migrate_prep(); while (pfn < end || !list_empty(&cc->migratepages)) { if (fatal_signal_pending(current)) { @@ -5705,61 +5829,14 @@ static int __alloc_contig_migrate_range(struct compact_control *cc, &cc->migratepages); cc->nr_migratepages -= nr_reclaimed; - ret = migrate_pages(&cc->migratepages, - alloc_migrate_target, - 0, false, MIGRATE_SYNC); + ret = migrate_pages(&cc->migratepages, alloc_migrate_target, + 0, MIGRATE_SYNC, MR_CMA); } - - putback_lru_pages(&cc->migratepages); - return ret > 0 ? 0 : ret; -} - -/* - * Update zone's cma pages counter used for watermark level calculation. - */ -static inline void __update_cma_watermarks(struct zone *zone, int count) -{ - unsigned long flags; - spin_lock_irqsave(&zone->lock, flags); - zone->min_cma_pages += count; - spin_unlock_irqrestore(&zone->lock, flags); - setup_per_zone_wmarks(); -} - -/* - * Trigger memory pressure bump to reclaim some pages in order to be able to - * allocate 'count' pages in single page units. Does similar work as - *__alloc_pages_slowpath() function. - */ -static int __reclaim_pages(struct zone *zone, gfp_t gfp_mask, int count) -{ - enum zone_type high_zoneidx = gfp_zone(gfp_mask); - struct zonelist *zonelist = node_zonelist(0, gfp_mask); - int did_some_progress = 0; - int order = 1; - - /* - * Increase level of watermarks to force kswapd do his job - * to stabilise at new watermark level. - */ - __update_cma_watermarks(zone, count); - - /* Obey watermarks as if the page was being allocated */ - while (!zone_watermark_ok(zone, 0, low_wmark_pages(zone), 0, 0)) { - wake_all_kswapd(order, zonelist, high_zoneidx, zone_idx(zone)); - - did_some_progress = __perform_reclaim(gfp_mask, order, zonelist, - NULL); - if (!did_some_progress) { - /* Exhausted what can be done so it's blamo time */ - out_of_memory(zonelist, gfp_mask, order, NULL, false); - } + if (ret < 0) { + putback_movable_pages(&cc->migratepages); + return ret; } - - /* Restore original watermark levels. */ - __update_cma_watermarks(zone, -count); - - return count; + return 0; } /** @@ -5785,7 +5862,6 @@ static int __reclaim_pages(struct zone *zone, gfp_t gfp_mask, int count) int alloc_contig_range(unsigned long start, unsigned long end, unsigned migratetype) { - struct zone *zone = page_zone(pfn_to_page(start)); unsigned long outer_start, outer_end; int ret = 0, order; @@ -5823,7 +5899,8 @@ int alloc_contig_range(unsigned long start, unsigned long end, */ ret = start_isolate_page_range(pfn_max_align_down(start), - pfn_max_align_up(end), migratetype); + pfn_max_align_up(end), migratetype, + false); if (ret) return ret; @@ -5862,18 +5939,13 @@ int alloc_contig_range(unsigned long start, unsigned long end, } /* Make sure the range is really isolated. */ - if (test_pages_isolated(outer_start, end)) { + if (test_pages_isolated(outer_start, end, false)) { pr_warn("alloc_contig_range test_pages_isolated(%lx, %lx) failed\n", outer_start, end); ret = -EBUSY; goto done; } - /* - * Reclaim enough pages to make sure that contiguous allocation - * will not starve the system. - */ - __reclaim_pages(zone, GFP_HIGHUSER_MOVABLE, end-start); /* Grab isolated pages from freelists. */ outer_end = isolate_freepages_range(&cc, outer_start, end); @@ -5896,8 +5968,15 @@ done: void free_contig_range(unsigned long pfn, unsigned nr_pages) { - for (; nr_pages--; ++pfn) - __free_page(pfn_to_page(pfn)); + unsigned int count = 0; + + for (; nr_pages--; pfn++) { + struct page *page = pfn_to_page(pfn); + + count += page_count(page) != 1; + __free_page(page); + } + WARN(count != 0, "%d pages are still in use!\n", count); } #endif @@ -5931,7 +6010,6 @@ void __meminit zone_pcp_update(struct zone *zone) } #endif -#ifdef CONFIG_MEMORY_HOTREMOVE void zone_pcp_reset(struct zone *zone) { unsigned long flags; @@ -5951,6 +6029,7 @@ void zone_pcp_reset(struct zone *zone) local_irq_restore(flags); } +#ifdef CONFIG_MEMORY_HOTREMOVE /* * All pages in the range must be isolated before calling this. */ @@ -5977,6 +6056,16 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) continue; } page = pfn_to_page(pfn); + /* + * The HWPoisoned page may be not in buddy system, and + * page_count() is not 0. + */ + if (unlikely(!PageBuddy(page) && PageHWPoison(page))) { + pfn++; + SetPageReserved(page); + continue; + } + BUG_ON(page_count(page)); BUG_ON(!PageBuddy(page)); order = page_order(page); @@ -5987,8 +6076,6 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) list_del(&page->lru); rmv_page_order(page); zone->free_area[order].nr_free--; - __mod_zone_page_state(zone, NR_FREE_PAGES, - - (1UL << order)); for (i = 0; i < (1 << order); i++) SetPageReserved((page+i)); pfn += (1 << order); @@ -6098,37 +6185,3 @@ void dump_page(struct page *page) dump_page_flags(page->flags); mem_cgroup_print_bad_page(page); } - -/* reset zone->present_pages */ -void reset_zone_present_pages(void) -{ - struct zone *z; - int i, nid; - - for_each_node_state(nid, N_HIGH_MEMORY) { - for (i = 0; i < MAX_NR_ZONES; i++) { - z = NODE_DATA(nid)->node_zones + i; - z->present_pages = 0; - } - } -} - -/* calculate zone's present pages in buddy system */ -void fixup_zone_present_pages(int nid, unsigned long start_pfn, - unsigned long end_pfn) -{ - struct zone *z; - unsigned long zone_start_pfn, zone_end_pfn; - int i; - - for (i = 0; i < MAX_NR_ZONES; i++) { - z = NODE_DATA(nid)->node_zones + i; - zone_start_pfn = z->zone_start_pfn; - zone_end_pfn = zone_start_pfn + z->spanned_pages; - - /* if the two regions intersect */ - if (!(zone_start_pfn >= end_pfn || zone_end_pfn <= start_pfn)) - z->present_pages += min(end_pfn, zone_end_pfn) - - max(start_pfn, zone_start_pfn); - } -} |