diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 487 |
1 files changed, 384 insertions, 103 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 838ca8bb64f7..a762be57e46e 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -223,6 +223,19 @@ static char * const zone_names[MAX_NR_ZONES] = { #endif }; +char * const migratetype_names[MIGRATE_TYPES] = { + "Unmovable", + "Movable", + "Reclaimable", + "HighAtomic", +#ifdef CONFIG_CMA + "CMA", +#endif +#ifdef CONFIG_MEMORY_ISOLATION + "Isolate", +#endif +}; + compound_page_dtor * const compound_page_dtors[] = { NULL, free_compound_page, @@ -236,6 +249,7 @@ compound_page_dtor * const compound_page_dtors[] = { int min_free_kbytes = 1024; int user_min_free_kbytes = -1; +int watermark_scale_factor = 10; static unsigned long __meminitdata nr_kernel_pages; static unsigned long __meminitdata nr_all_pages; @@ -247,6 +261,7 @@ static unsigned long __meminitdata arch_zone_highest_possible_pfn[MAX_NR_ZONES]; static unsigned long __initdata required_kernelcore; static unsigned long __initdata required_movablecore; static unsigned long __meminitdata zone_movable_pfn[MAX_NUMNODES]; +static bool mirrored_kernelcore; /* movable_zone is the "real" zone pages in ZONE_MOVABLE are taken from */ int movable_zone; @@ -293,13 +308,20 @@ static inline bool update_defer_init(pg_data_t *pgdat, unsigned long pfn, unsigned long zone_end, unsigned long *nr_initialised) { + unsigned long max_initialise; + /* Always populate low zones for address-contrained allocations */ if (zone_end < pgdat_end_pfn(pgdat)) return true; + /* + * Initialise at least 2G of a node but also take into account that + * two large system hashes that can take up 1GB for 0.25TB/node. + */ + max_initialise = max(2UL << (30 - PAGE_SHIFT), + (pgdat->node_spanned_pages >> 8)); - /* Initialise at least 2G of the highest zone */ (*nr_initialised)++; - if (*nr_initialised > (2UL << (30 - PAGE_SHIFT)) && + if ((*nr_initialised > max_initialise) && (pfn & (PAGES_PER_SECTION - 1)) == 0) { pgdat->first_deferred_pfn = pfn; return false; @@ -416,7 +438,7 @@ static void bad_page(struct page *page, const char *reason, goto out; } if (nr_unshown) { - printk(KERN_ALERT + pr_alert( "BUG: Bad page state: %lu messages suppressed\n", nr_unshown); nr_unshown = 0; @@ -426,9 +448,14 @@ static void bad_page(struct page *page, const char *reason, if (nr_shown++ == 0) resume = jiffies + 60 * HZ; - printk(KERN_ALERT "BUG: Bad page state in process %s pfn:%05lx\n", + pr_alert("BUG: Bad page state in process %s pfn:%05lx\n", current->comm, page_to_pfn(page)); - dump_page_badflags(page, reason, bad_flags); + __dump_page(page, reason); + bad_flags &= page->flags; + if (bad_flags) + pr_alert("bad because of flags: %#lx(%pGp)\n", + bad_flags, &bad_flags); + dump_page_owner(page); print_modules(); dump_stack(); @@ -477,7 +504,9 @@ void prep_compound_page(struct page *page, unsigned int order) #ifdef CONFIG_DEBUG_PAGEALLOC unsigned int _debug_guardpage_minorder; -bool _debug_pagealloc_enabled __read_mostly; +bool _debug_pagealloc_enabled __read_mostly + = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); +EXPORT_SYMBOL(_debug_pagealloc_enabled); bool _debug_guardpage_enabled __read_mostly; static int __init early_debug_pagealloc(char *buf) @@ -488,6 +517,9 @@ static int __init early_debug_pagealloc(char *buf) if (strcmp(buf, "on") == 0) _debug_pagealloc_enabled = true; + if (strcmp(buf, "off") == 0) + _debug_pagealloc_enabled = false; + return 0; } early_param("debug_pagealloc", early_debug_pagealloc); @@ -519,11 +551,11 @@ static int __init debug_guardpage_minorder_setup(char *buf) unsigned long res; if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { - printk(KERN_ERR "Bad debug_guardpage_minorder value\n"); + pr_err("Bad debug_guardpage_minorder value\n"); return 0; } _debug_guardpage_minorder = res; - printk(KERN_INFO "Setting debug_guardpage_minorder to %lu\n", res); + pr_info("Setting debug_guardpage_minorder to %lu\n", res); return 0; } __setup("debug_guardpage_minorder=", debug_guardpage_minorder_setup); @@ -741,7 +773,7 @@ static inline int free_pages_check(struct page *page) bad_reason = "nonzero mapcount"; if (unlikely(page->mapping != NULL)) bad_reason = "non-NULL mapping"; - if (unlikely(atomic_read(&page->_count) != 0)) + if (unlikely(page_ref_count(page) != 0)) bad_reason = "nonzero _count"; if (unlikely(page->flags & PAGE_FLAGS_CHECK_AT_FREE)) { bad_reason = "PAGE_FLAGS_CHECK_AT_FREE flag(s) set"; @@ -1002,6 +1034,7 @@ static bool free_pages_prepare(struct page *page, unsigned int order) PAGE_SIZE << order); } arch_free_page(page, order); + kernel_poison_pages(page, 1 << order, 0); kernel_map_pages(page, 1 << order, 0); return true; @@ -1104,6 +1137,75 @@ void __init __free_pages_bootmem(struct page *page, unsigned long pfn, return __free_pages_boot_core(page, pfn, order); } +/* + * Check that the whole (or subset of) a pageblock given by the interval of + * [start_pfn, end_pfn) is valid and within the same zone, before scanning it + * with the migration of free compaction scanner. The scanners then need to + * use only pfn_valid_within() check for arches that allow holes within + * pageblocks. + * + * Return struct page pointer of start_pfn, or NULL if checks were not passed. + * + * It's possible on some configurations to have a setup like node0 node1 node0 + * i.e. it's possible that all pages within a zones range of pages do not + * belong to a single zone. We assume that a border between node0 and node1 + * can occur within a single pageblock, but not a node0 node1 node0 + * interleaving within a single pageblock. It is therefore sufficient to check + * the first and last page of a pageblock and avoid checking each individual + * page in a pageblock. + */ +struct page *__pageblock_pfn_to_page(unsigned long start_pfn, + unsigned long end_pfn, struct zone *zone) +{ + struct page *start_page; + struct page *end_page; + + /* end_pfn is one past the range we are checking */ + end_pfn--; + + if (!pfn_valid(start_pfn) || !pfn_valid(end_pfn)) + return NULL; + + start_page = pfn_to_page(start_pfn); + + if (page_zone(start_page) != zone) + return NULL; + + end_page = pfn_to_page(end_pfn); + + /* This gives a shorter code than deriving page_zone(end_page) */ + if (page_zone_id(start_page) != page_zone_id(end_page)) + return NULL; + + return start_page; +} + +void set_zone_contiguous(struct zone *zone) +{ + unsigned long block_start_pfn = zone->zone_start_pfn; + unsigned long block_end_pfn; + + block_end_pfn = ALIGN(block_start_pfn + 1, pageblock_nr_pages); + for (; block_start_pfn < zone_end_pfn(zone); + block_start_pfn = block_end_pfn, + block_end_pfn += pageblock_nr_pages) { + + block_end_pfn = min(block_end_pfn, zone_end_pfn(zone)); + + if (!__pageblock_pfn_to_page(block_start_pfn, + block_end_pfn, zone)) + return; + } + + /* We confirm that there is no hole */ + zone->contiguous = true; +} + +void clear_zone_contiguous(struct zone *zone) +{ + zone->contiguous = false; +} + #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT static void __init deferred_free_range(struct page *page, unsigned long pfn, int nr_pages) @@ -1254,9 +1356,13 @@ free_range: pgdat_init_report_one_done(); return 0; } +#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ void __init page_alloc_init_late(void) { + struct zone *zone; + +#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT int nid; /* There will be num_node_state(N_MEMORY) threads */ @@ -1270,8 +1376,11 @@ void __init page_alloc_init_late(void) /* Reinit limits that are based on free pages after the kernel is up */ files_maxfiles_init(); +#endif + + for_each_populated_zone(zone) + set_zone_contiguous(zone); } -#endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ #ifdef CONFIG_CMA /* Free whole pageblock and set its migration type to MIGRATE_CMA. */ @@ -1360,7 +1469,7 @@ static inline int check_new_page(struct page *page) bad_reason = "nonzero mapcount"; if (unlikely(page->mapping != NULL)) bad_reason = "non-NULL mapping"; - if (unlikely(atomic_read(&page->_count) != 0)) + if (unlikely(page_ref_count(page) != 0)) bad_reason = "nonzero _count"; if (unlikely(page->flags & __PG_HWPOISON)) { bad_reason = "HWPoisoned (hardware-corrupted)"; @@ -1381,15 +1490,24 @@ static inline int check_new_page(struct page *page) return 0; } +static inline bool free_pages_prezeroed(bool poisoned) +{ + return IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) && + page_poisoning_enabled() && poisoned; +} + static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, int alloc_flags) { int i; + bool poisoned = true; for (i = 0; i < (1 << order); i++) { struct page *p = page + i; if (unlikely(check_new_page(p))) return 1; + if (poisoned) + poisoned &= page_is_poisoned(p); } set_page_private(page, 0); @@ -1397,9 +1515,10 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, arch_alloc_page(page, order); kernel_map_pages(page, 1 << order, 1); + kernel_poison_pages(page, 1 << order, 1); kasan_alloc_pages(page, order); - if (gfp_flags & __GFP_ZERO) + if (!free_pages_prezeroed(poisoned) && (gfp_flags & __GFP_ZERO)) for (i = 0; i < (1 << order); i++) clear_highpage(page + i); @@ -2238,19 +2357,11 @@ struct page *buffered_rmqueue(struct zone *preferred_zone, list_del(&page->lru); pcp->count--; } else { - if (unlikely(gfp_flags & __GFP_NOFAIL)) { - /* - * __GFP_NOFAIL is not to be used in new code. - * - * All __GFP_NOFAIL callers should be fixed so that they - * properly detect and handle allocation failures. - * - * We most definitely don't want callers attempting to - * allocate greater than order-1 page units with - * __GFP_NOFAIL. - */ - WARN_ON_ONCE(order > 1); - } + /* + * We most definitely don't want callers attempting to + * allocate greater than order-1 page units with __GFP_NOFAIL. + */ + WARN_ON_ONCE((gfp_flags & __GFP_NOFAIL) && (order > 1)); spin_lock_irqsave(&zone->lock, flags); page = NULL; @@ -2690,9 +2801,8 @@ void warn_alloc_failed(gfp_t gfp_mask, unsigned int order, const char *fmt, ...) va_end(args); } - pr_warn("%s: page allocation failure: order:%u, mode:0x%x\n", - current->comm, order, gfp_mask); - + pr_warn("%s: page allocation failure: order:%u, mode:%#x(%pGg)\n", + current->comm, order, gfp_mask, &gfp_mask); dump_stack(); if (!should_suppress_show_mem()) show_mem(filter); @@ -2748,8 +2858,12 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, * XXX: Page reclaim didn't yield anything, * and the OOM killer can't be invoked, but * keep looping as per tradition. + * + * But do not keep looping if oom_killer_disable() + * was already called, for the system is trying to + * enter a quiescent state during suspend. */ - *did_some_progress = 1; + *did_some_progress = !oom_killer_disabled; goto out; } if (pm_suspended_storage()) @@ -3008,14 +3122,6 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, (__GFP_ATOMIC|__GFP_DIRECT_RECLAIM))) gfp_mask &= ~__GFP_ATOMIC; - /* - * If this allocation cannot block and it is for a specific node, then - * fail early. There's no need to wakeup kswapd or retry for a - * speculative node-specific allocation. - */ - if (IS_ENABLED(CONFIG_NUMA) && (gfp_mask & __GFP_THISNODE) && !can_direct_reclaim) - goto nopage; - retry: if (gfp_mask & __GFP_KSWAPD_RECLAIM) wake_all_kswapds(order, ac); @@ -3372,7 +3478,7 @@ refill: /* Even if we own the page, we do not use atomic_set(). * This would break get_page_unless_zero() users. */ - atomic_add(size - 1, &page->_count); + page_ref_add(page, size - 1); /* reset page count bias and offset to start of new frag */ nc->pfmemalloc = page_is_pfmemalloc(page); @@ -3384,7 +3490,7 @@ refill: if (unlikely(offset < 0)) { page = virt_to_page(nc->va); - if (!atomic_sub_and_test(nc->pagecnt_bias, &page->_count)) + if (!page_ref_sub_and_test(page, nc->pagecnt_bias)) goto refill; #if (PAGE_SIZE < PAGE_FRAG_CACHE_MAX_SIZE) @@ -3392,7 +3498,7 @@ refill: size = nc->size; #endif /* OK, page count is 0, we can safely set it */ - atomic_set(&page->_count, size); + set_page_count(page, size); /* reset page count bias and offset to start of new frag */ nc->pagecnt_bias = size; @@ -3603,6 +3709,49 @@ static inline void show_node(struct zone *zone) printk("Node %d ", zone_to_nid(zone)); } +long si_mem_available(void) +{ + long available; + unsigned long pagecache; + unsigned long wmark_low = 0; + unsigned long pages[NR_LRU_LISTS]; + struct zone *zone; + int lru; + + for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++) + pages[lru] = global_page_state(NR_LRU_BASE + lru); + + for_each_zone(zone) + wmark_low += zone->watermark[WMARK_LOW]; + + /* + * Estimate the amount of memory available for userspace allocations, + * without causing swapping. + */ + available = global_page_state(NR_FREE_PAGES) - totalreserve_pages; + + /* + * Not all the page cache can be freed, otherwise the system will + * start swapping. Assume at least half of the page cache, or the + * low watermark worth of cache, needs to stay. + */ + pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE]; + pagecache -= min(pagecache / 2, wmark_low); + available += pagecache; + + /* + * Part of the reclaimable slab consists of items that are in use, + * and cannot be freed. Cap this estimate at the low watermark. + */ + available += global_page_state(NR_SLAB_RECLAIMABLE) - + min(global_page_state(NR_SLAB_RECLAIMABLE) / 2, wmark_low); + + if (available < 0) + available = 0; + return available; +} +EXPORT_SYMBOL_GPL(si_mem_available); + void si_meminfo(struct sysinfo *val) { val->totalram = totalram_pages; @@ -3935,9 +4084,7 @@ static int __parse_numa_zonelist_order(char *s) } else if (*s == 'z' || *s == 'Z') { user_zonelist_order = ZONELIST_ORDER_ZONE; } else { - printk(KERN_WARNING - "Ignoring invalid numa_zonelist_order value: " - "%s\n", s); + pr_warn("Ignoring invalid numa_zonelist_order value: %s\n", s); return -EINVAL; } return 0; @@ -4401,12 +4548,11 @@ void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) else page_group_by_mobility_disabled = 0; - pr_info("Built %i zonelists in %s order, mobility grouping %s. " - "Total pages: %ld\n", - nr_online_nodes, - zonelist_order_name[current_zonelist_order], - page_group_by_mobility_disabled ? "off" : "on", - vm_total_pages); + pr_info("Built %i zonelists in %s order, mobility grouping %s. Total pages: %ld\n", + nr_online_nodes, + zonelist_order_name[current_zonelist_order], + page_group_by_mobility_disabled ? "off" : "on", + vm_total_pages); #ifdef CONFIG_NUMA pr_info("Policy zone: %s\n", zone_names[policy_zone]); #endif @@ -4491,6 +4637,9 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, pg_data_t *pgdat = NODE_DATA(nid); unsigned long pfn; unsigned long nr_initialised = 0; +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP + struct memblock_region *r = NULL, *tmp; +#endif if (highest_memmap_pfn < end_pfn - 1) highest_memmap_pfn = end_pfn - 1; @@ -4504,20 +4653,51 @@ void __meminit memmap_init_zone(unsigned long size, int nid, unsigned long zone, for (pfn = start_pfn; pfn < end_pfn; pfn++) { /* - * There can be holes in boot-time mem_map[]s - * handed to this function. They do not - * exist on hotplugged memory. + * There can be holes in boot-time mem_map[]s handed to this + * function. They do not exist on hotplugged memory. + */ + if (context != MEMMAP_EARLY) + goto not_early; + + if (!early_pfn_valid(pfn)) + continue; + if (!early_pfn_in_nid(pfn, nid)) + continue; + if (!update_defer_init(pgdat, pfn, end_pfn, &nr_initialised)) + break; + +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP + /* + * If not mirrored_kernelcore and ZONE_MOVABLE exists, range + * from zone_movable_pfn[nid] to end of each node should be + * ZONE_MOVABLE not ZONE_NORMAL. skip it. */ - if (context == MEMMAP_EARLY) { - if (!early_pfn_valid(pfn)) + if (!mirrored_kernelcore && zone_movable_pfn[nid]) + if (zone == ZONE_NORMAL && pfn >= zone_movable_pfn[nid]) continue; - if (!early_pfn_in_nid(pfn, nid)) + + /* + * Check given memblock attribute by firmware which can affect + * kernel memory layout. If zone==ZONE_MOVABLE but memory is + * mirrored, it's an overlapped memmap init. skip it. + */ + if (mirrored_kernelcore && zone == ZONE_MOVABLE) { + if (!r || pfn >= memblock_region_memory_end_pfn(r)) { + for_each_memblock(memory, tmp) + if (pfn < memblock_region_memory_end_pfn(tmp)) + break; + r = tmp; + } + if (pfn >= memblock_region_memory_base_pfn(r) && + memblock_is_mirror(r)) { + /* already initialized as NORMAL */ + pfn = memblock_region_memory_end_pfn(r); continue; - if (!update_defer_init(pgdat, pfn, end_pfn, - &nr_initialised)) - break; + } } +#endif +not_early: /* * Mark the block movable so that blocks are reserved for * movable at startup. This will force kernel allocations @@ -4934,11 +5114,6 @@ static void __meminit adjust_zone_range_for_zone_movable(int nid, *zone_end_pfn = min(node_end_pfn, arch_zone_highest_possible_pfn[movable_zone]); - /* Adjust for ZONE_MOVABLE starting within this range */ - } else if (*zone_start_pfn < zone_movable_pfn[nid] && - *zone_end_pfn > zone_movable_pfn[nid]) { - *zone_end_pfn = zone_movable_pfn[nid]; - /* Check if this whole range is within ZONE_MOVABLE */ } else if (*zone_start_pfn >= zone_movable_pfn[nid]) *zone_start_pfn = *zone_end_pfn; @@ -4953,31 +5128,31 @@ static unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, unsigned long node_start_pfn, unsigned long node_end_pfn, + unsigned long *zone_start_pfn, + unsigned long *zone_end_pfn, unsigned long *ignored) { - unsigned long zone_start_pfn, zone_end_pfn; - /* When hotadd a new node from cpu_up(), the node should be empty */ if (!node_start_pfn && !node_end_pfn) return 0; /* Get the start and end of the zone */ - zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; - zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; + *zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; + *zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; adjust_zone_range_for_zone_movable(nid, zone_type, node_start_pfn, node_end_pfn, - &zone_start_pfn, &zone_end_pfn); + zone_start_pfn, zone_end_pfn); /* Check that this node has pages within the zone's required range */ - if (zone_end_pfn < node_start_pfn || zone_start_pfn > node_end_pfn) + if (*zone_end_pfn < node_start_pfn || *zone_start_pfn > node_end_pfn) return 0; /* Move the zone boundaries inside the node if necessary */ - zone_end_pfn = min(zone_end_pfn, node_end_pfn); - zone_start_pfn = max(zone_start_pfn, node_start_pfn); + *zone_end_pfn = min(*zone_end_pfn, node_end_pfn); + *zone_start_pfn = max(*zone_start_pfn, node_start_pfn); /* Return the spanned pages */ - return zone_end_pfn - zone_start_pfn; + return *zone_end_pfn - *zone_start_pfn; } /* @@ -5023,6 +5198,7 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid, unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; unsigned long zone_start_pfn, zone_end_pfn; + unsigned long nr_absent; /* When hotadd a new node from cpu_up(), the node should be empty */ if (!node_start_pfn && !node_end_pfn) @@ -5034,7 +5210,39 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid, adjust_zone_range_for_zone_movable(nid, zone_type, node_start_pfn, node_end_pfn, &zone_start_pfn, &zone_end_pfn); - return __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); + nr_absent = __absent_pages_in_range(nid, zone_start_pfn, zone_end_pfn); + + /* + * ZONE_MOVABLE handling. + * Treat pages to be ZONE_MOVABLE in ZONE_NORMAL as absent pages + * and vice versa. + */ + if (zone_movable_pfn[nid]) { + if (mirrored_kernelcore) { + unsigned long start_pfn, end_pfn; + struct memblock_region *r; + + for_each_memblock(memory, r) { + start_pfn = clamp(memblock_region_memory_base_pfn(r), + zone_start_pfn, zone_end_pfn); + end_pfn = clamp(memblock_region_memory_end_pfn(r), + zone_start_pfn, zone_end_pfn); + + if (zone_type == ZONE_MOVABLE && + memblock_is_mirror(r)) + nr_absent += end_pfn - start_pfn; + + if (zone_type == ZONE_NORMAL && + !memblock_is_mirror(r)) + nr_absent += end_pfn - start_pfn; + } + } else { + if (zone_type == ZONE_NORMAL) + nr_absent += node_end_pfn - zone_movable_pfn[nid]; + } + } + + return nr_absent; } #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ @@ -5042,8 +5250,18 @@ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, unsigned long node_start_pfn, unsigned long node_end_pfn, + unsigned long *zone_start_pfn, + unsigned long *zone_end_pfn, unsigned long *zones_size) { + unsigned int zone; + + *zone_start_pfn = node_start_pfn; + for (zone = 0; zone < zone_type; zone++) + *zone_start_pfn += zones_size[zone]; + + *zone_end_pfn = *zone_start_pfn + zones_size[zone_type]; + return zones_size[zone_type]; } @@ -5072,15 +5290,22 @@ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, for (i = 0; i < MAX_NR_ZONES; i++) { struct zone *zone = pgdat->node_zones + i; + unsigned long zone_start_pfn, zone_end_pfn; unsigned long size, real_size; size = zone_spanned_pages_in_node(pgdat->node_id, i, node_start_pfn, node_end_pfn, + &zone_start_pfn, + &zone_end_pfn, zones_size); real_size = size - zone_absent_pages_in_node(pgdat->node_id, i, node_start_pfn, node_end_pfn, zholes_size); + if (size) + zone->zone_start_pfn = zone_start_pfn; + else + zone->zone_start_pfn = 0; zone->spanned_pages = size; zone->present_pages = real_size; @@ -5201,7 +5426,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) { enum zone_type j; int nid = pgdat->node_id; - unsigned long zone_start_pfn = pgdat->node_start_pfn; int ret; pgdat_resize_init(pgdat); @@ -5217,11 +5441,15 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) #endif init_waitqueue_head(&pgdat->kswapd_wait); init_waitqueue_head(&pgdat->pfmemalloc_wait); +#ifdef CONFIG_COMPACTION + init_waitqueue_head(&pgdat->kcompactd_wait); +#endif pgdat_page_ext_init(pgdat); for (j = 0; j < MAX_NR_ZONES; j++) { struct zone *zone = pgdat->node_zones + j; unsigned long size, realsize, freesize, memmap_pages; + unsigned long zone_start_pfn = zone->zone_start_pfn; size = zone->spanned_pages; realsize = freesize = zone->present_pages; @@ -5240,8 +5468,7 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) " %s zone: %lu pages used for memmap\n", zone_names[j], memmap_pages); } else - printk(KERN_WARNING - " %s zone: %lu pages exceeds freesize %lu\n", + pr_warn(" %s zone: %lu pages exceeds freesize %lu\n", zone_names[j], memmap_pages, freesize); } @@ -5290,7 +5517,6 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat) ret = init_currently_empty_zone(zone, zone_start_pfn, size); BUG_ON(ret); memmap_init(size, nid, j, zone_start_pfn); - zone_start_pfn += size; } } @@ -5358,6 +5584,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid, (u64)start_pfn << PAGE_SHIFT, end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0); +#else + start_pfn = node_start_pfn; #endif calculate_node_totalpages(pgdat, start_pfn, end_pfn, zones_size, zholes_size); @@ -5448,8 +5676,7 @@ static unsigned long __init find_min_pfn_for_node(int nid) min_pfn = min(min_pfn, start_pfn); if (min_pfn == ULONG_MAX) { - printk(KERN_WARNING - "Could not find start_pfn for node %d\n", nid); + pr_warn("Could not find start_pfn for node %d\n", nid); return 0; } @@ -5529,6 +5756,36 @@ static void __init find_zone_movable_pfns_for_nodes(void) } /* + * If kernelcore=mirror is specified, ignore movablecore option + */ + if (mirrored_kernelcore) { + bool mem_below_4gb_not_mirrored = false; + + for_each_memblock(memory, r) { + if (memblock_is_mirror(r)) + continue; + + nid = r->nid; + + usable_startpfn = memblock_region_memory_base_pfn(r); + + if (usable_startpfn < 0x100000) { + mem_below_4gb_not_mirrored = true; + continue; + } + + zone_movable_pfn[nid] = zone_movable_pfn[nid] ? + min(usable_startpfn, zone_movable_pfn[nid]) : + usable_startpfn; + } + + if (mem_below_4gb_not_mirrored) + pr_warn("This configuration results in unmirrored kernel memory."); + + goto out2; + } + + /* * If movablecore=nn[KMG] was specified, calculate what size of * kernelcore that corresponds so that memory usable for * any allocation type is evenly spread. If both kernelcore @@ -5788,6 +6045,12 @@ static int __init cmdline_parse_core(char *p, unsigned long *core) */ static int __init cmdline_parse_kernelcore(char *p) { + /* parse kernelcore=mirror */ + if (parse_option_str(p, "mirror")) { + mirrored_kernelcore = true; + return 0; + } + return cmdline_parse_core(p, &required_kernelcore); } @@ -5885,22 +6148,21 @@ void __init mem_init_print_info(const char *str) #undef adj_init_size - pr_info("Memory: %luK/%luK available " - "(%luK kernel code, %luK rwdata, %luK rodata, " - "%luK init, %luK bss, %luK reserved, %luK cma-reserved" + pr_info("Memory: %luK/%luK available (%luK kernel code, %luK rwdata, %luK rodata, %luK init, %luK bss, %luK reserved, %luK cma-reserved" #ifdef CONFIG_HIGHMEM - ", %luK highmem" + ", %luK highmem" #endif - "%s%s)\n", - nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10), - codesize >> 10, datasize >> 10, rosize >> 10, - (init_data_size + init_code_size) >> 10, bss_size >> 10, - (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10), - totalcma_pages << (PAGE_SHIFT-10), + "%s%s)\n", + nr_free_pages() << (PAGE_SHIFT - 10), + physpages << (PAGE_SHIFT - 10), + codesize >> 10, datasize >> 10, rosize >> 10, + (init_data_size + init_code_size) >> 10, bss_size >> 10, + (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10), + totalcma_pages << (PAGE_SHIFT - 10), #ifdef CONFIG_HIGHMEM - totalhigh_pages << (PAGE_SHIFT-10), + totalhigh_pages << (PAGE_SHIFT - 10), #endif - str ? ", " : "", str ? str : ""); + str ? ", " : "", str ? str : ""); } /** @@ -6075,8 +6337,17 @@ static void __setup_per_zone_wmarks(void) zone->watermark[WMARK_MIN] = tmp; } - zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + (tmp >> 2); - zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + (tmp >> 1); + /* + * Set the kswapd watermarks distance according to the + * scale factor in proportion to available memory, but + * ensure a minimum size on small systems. + */ + tmp = max_t(u64, tmp >> 2, + mult_frac(zone->managed_pages, + watermark_scale_factor, 10000)); + + zone->watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; + zone->watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; __mod_zone_page_state(zone, NR_ALLOC_BATCH, high_wmark_pages(zone) - low_wmark_pages(zone) - @@ -6217,6 +6488,21 @@ int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, return 0; } +int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *length, loff_t *ppos) +{ + int rc; + + rc = proc_dointvec_minmax(table, write, buffer, length, ppos); + if (rc) + return rc; + + if (write) + setup_per_zone_wmarks(); + + return 0; +} + #ifdef CONFIG_NUMA int sysctl_min_unmapped_ratio_sysctl_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) @@ -6408,11 +6694,8 @@ void *__init alloc_large_system_hash(const char *tablename, if (!table) panic("Failed to allocate %s hash table\n", tablename); - printk(KERN_INFO "%s hash table entries: %ld (order: %d, %lu bytes)\n", - tablename, - (1UL << log2qty), - ilog2(size) - PAGE_SHIFT, - size); + pr_info("%s hash table entries: %ld (order: %d, %lu bytes)\n", + tablename, 1UL << log2qty, ilog2(size) - PAGE_SHIFT, size); if (_hash_shift) *_hash_shift = log2qty; @@ -6563,7 +6846,7 @@ bool has_unmovable_pages(struct zone *zone, struct page *page, int count, * This check already skips compound tails of THP * because their page->_count is zero at all time. */ - if (!atomic_read(&page->_count)) { + if (!page_ref_count(page)) { if (PageBuddy(page)) iter += (1 << page_order(page)) - 1; continue; @@ -6913,8 +7196,8 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) BUG_ON(!PageBuddy(page)); order = page_order(page); #ifdef CONFIG_DEBUG_VM - printk(KERN_INFO "remove from free list %lx %d %lx\n", - pfn, 1 << order, end_pfn); + pr_info("remove from free list %lx %d %lx\n", + pfn, 1 << order, end_pfn); #endif list_del(&page->lru); rmv_page_order(page); @@ -6927,7 +7210,6 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) } #endif -#ifdef CONFIG_MEMORY_FAILURE bool is_free_buddy_page(struct page *page) { struct zone *zone = page_zone(page); @@ -6946,4 +7228,3 @@ bool is_free_buddy_page(struct page *page) return order < MAX_ORDER; } -#endif |