diff options
Diffstat (limited to 'mm')
39 files changed, 2534 insertions, 1074 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index a3f8dddaaab3..71259e052ce8 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -143,6 +143,14 @@ config NO_BOOTMEM config MEMORY_ISOLATION boolean +config MOVABLE_NODE + boolean "Enable to assign a node which has only movable memory" + depends on HAVE_MEMBLOCK + depends on NO_BOOTMEM + depends on X86_64 + depends on NUMA + depends on BROKEN + # eventually, we can have this option just 'select SPARSEMEM' config MEMORY_HOTPLUG bool "Allow for memory hot-add" @@ -188,6 +196,21 @@ config SPLIT_PTLOCK_CPUS default "4" # +# support for memory balloon compaction +config BALLOON_COMPACTION + bool "Allow for balloon memory compaction/migration" + def_bool y + depends on COMPACTION && VIRTIO_BALLOON + help + Memory fragmentation introduced by ballooning might reduce + significantly the number of 2MB contiguous memory blocks that can be + used within a guest, thus imposing performance penalties associated + with the reduced number of transparent huge pages that could be used + by the guest workload. Allowing the compaction & migration for memory + pages enlisted as being part of memory balloon devices avoids the + scenario aforementioned and helps improving memory defragmentation. + +# # support for memory compaction config COMPACTION bool "Allow for memory compaction" diff --git a/mm/Makefile b/mm/Makefile index 6b025f80af34..3a4628751f89 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -16,7 +16,8 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ readahead.o swap.o truncate.o vmscan.o shmem.o \ util.o mmzone.o vmstat.o backing-dev.o \ mm_init.o mmu_context.o percpu.o slab_common.o \ - compaction.o interval_tree.o $(mmu-y) + compaction.o balloon_compaction.o \ + interval_tree.o $(mmu-y) obj-y += init-mm.o diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c new file mode 100644 index 000000000000..07dbc8ec46cf --- /dev/null +++ b/mm/balloon_compaction.c @@ -0,0 +1,302 @@ +/* + * mm/balloon_compaction.c + * + * Common interface for making balloon pages movable by compaction. + * + * Copyright (C) 2012, Red Hat, Inc. Rafael Aquini <aquini@redhat.com> + */ +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/balloon_compaction.h> + +/* + * balloon_devinfo_alloc - allocates a balloon device information descriptor. + * @balloon_dev_descriptor: pointer to reference the balloon device which + * this struct balloon_dev_info will be servicing. + * + * Driver must call it to properly allocate and initialize an instance of + * struct balloon_dev_info which will be used to reference a balloon device + * as well as to keep track of the balloon device page list. + */ +struct balloon_dev_info *balloon_devinfo_alloc(void *balloon_dev_descriptor) +{ + struct balloon_dev_info *b_dev_info; + b_dev_info = kmalloc(sizeof(*b_dev_info), GFP_KERNEL); + if (!b_dev_info) + return ERR_PTR(-ENOMEM); + + b_dev_info->balloon_device = balloon_dev_descriptor; + b_dev_info->mapping = NULL; + b_dev_info->isolated_pages = 0; + spin_lock_init(&b_dev_info->pages_lock); + INIT_LIST_HEAD(&b_dev_info->pages); + + return b_dev_info; +} +EXPORT_SYMBOL_GPL(balloon_devinfo_alloc); + +/* + * balloon_page_enqueue - allocates a new page and inserts it into the balloon + * page list. + * @b_dev_info: balloon device decriptor where we will insert a new page to + * + * Driver must call it to properly allocate a new enlisted balloon page + * before definetively removing it from the guest system. + * This function returns the page address for the recently enqueued page or + * NULL in the case we fail to allocate a new page this turn. + */ +struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info) +{ + unsigned long flags; + struct page *page = alloc_page(balloon_mapping_gfp_mask() | + __GFP_NOMEMALLOC | __GFP_NORETRY); + if (!page) + return NULL; + + /* + * Block others from accessing the 'page' when we get around to + * establishing additional references. We should be the only one + * holding a reference to the 'page' at this point. + */ + BUG_ON(!trylock_page(page)); + spin_lock_irqsave(&b_dev_info->pages_lock, flags); + balloon_page_insert(page, b_dev_info->mapping, &b_dev_info->pages); + spin_unlock_irqrestore(&b_dev_info->pages_lock, flags); + unlock_page(page); + return page; +} +EXPORT_SYMBOL_GPL(balloon_page_enqueue); + +/* + * balloon_page_dequeue - removes a page from balloon's page list and returns + * the its address to allow the driver release the page. + * @b_dev_info: balloon device decriptor where we will grab a page from. + * + * Driver must call it to properly de-allocate a previous enlisted balloon page + * before definetively releasing it back to the guest system. + * This function returns the page address for the recently dequeued page or + * NULL in the case we find balloon's page list temporarily empty due to + * compaction isolated pages. + */ +struct page *balloon_page_dequeue(struct balloon_dev_info *b_dev_info) +{ + struct page *page, *tmp; + unsigned long flags; + bool dequeued_page; + + dequeued_page = false; + list_for_each_entry_safe(page, tmp, &b_dev_info->pages, lru) { + /* + * Block others from accessing the 'page' while we get around + * establishing additional references and preparing the 'page' + * to be released by the balloon driver. + */ + if (trylock_page(page)) { + spin_lock_irqsave(&b_dev_info->pages_lock, flags); + /* + * Raise the page refcount here to prevent any wrong + * attempt to isolate this page, in case of coliding + * with balloon_page_isolate() just after we release + * the page lock. + * + * balloon_page_free() will take care of dropping + * this extra refcount later. + */ + get_page(page); + balloon_page_delete(page); + spin_unlock_irqrestore(&b_dev_info->pages_lock, flags); + unlock_page(page); + dequeued_page = true; + break; + } + } + + if (!dequeued_page) { + /* + * If we are unable to dequeue a balloon page because the page + * list is empty and there is no isolated pages, then something + * went out of track and some balloon pages are lost. + * BUG() here, otherwise the balloon driver may get stuck into + * an infinite loop while attempting to release all its pages. + */ + spin_lock_irqsave(&b_dev_info->pages_lock, flags); + if (unlikely(list_empty(&b_dev_info->pages) && + !b_dev_info->isolated_pages)) + BUG(); + spin_unlock_irqrestore(&b_dev_info->pages_lock, flags); + page = NULL; + } + return page; +} +EXPORT_SYMBOL_GPL(balloon_page_dequeue); + +#ifdef CONFIG_BALLOON_COMPACTION +/* + * balloon_mapping_alloc - allocates a special ->mapping for ballooned pages. + * @b_dev_info: holds the balloon device information descriptor. + * @a_ops: balloon_mapping address_space_operations descriptor. + * + * Driver must call it to properly allocate and initialize an instance of + * struct address_space which will be used as the special page->mapping for + * balloon device enlisted page instances. + */ +struct address_space *balloon_mapping_alloc(struct balloon_dev_info *b_dev_info, + const struct address_space_operations *a_ops) +{ + struct address_space *mapping; + + mapping = kmalloc(sizeof(*mapping), GFP_KERNEL); + if (!mapping) + return ERR_PTR(-ENOMEM); + + /* + * Give a clean 'zeroed' status to all elements of this special + * balloon page->mapping struct address_space instance. + */ + address_space_init_once(mapping); + + /* + * Set mapping->flags appropriately, to allow balloon pages + * ->mapping identification. + */ + mapping_set_balloon(mapping); + mapping_set_gfp_mask(mapping, balloon_mapping_gfp_mask()); + + /* balloon's page->mapping->a_ops callback descriptor */ + mapping->a_ops = a_ops; + + /* + * Establish a pointer reference back to the balloon device descriptor + * this particular page->mapping will be servicing. + * This is used by compaction / migration procedures to identify and + * access the balloon device pageset while isolating / migrating pages. + * + * As some balloon drivers can register multiple balloon devices + * for a single guest, this also helps compaction / migration to + * properly deal with multiple balloon pagesets, when required. + */ + mapping->private_data = b_dev_info; + b_dev_info->mapping = mapping; + + return mapping; +} +EXPORT_SYMBOL_GPL(balloon_mapping_alloc); + +static inline void __isolate_balloon_page(struct page *page) +{ + struct balloon_dev_info *b_dev_info = page->mapping->private_data; + unsigned long flags; + spin_lock_irqsave(&b_dev_info->pages_lock, flags); + list_del(&page->lru); + b_dev_info->isolated_pages++; + spin_unlock_irqrestore(&b_dev_info->pages_lock, flags); +} + +static inline void __putback_balloon_page(struct page *page) +{ + struct balloon_dev_info *b_dev_info = page->mapping->private_data; + unsigned long flags; + spin_lock_irqsave(&b_dev_info->pages_lock, flags); + list_add(&page->lru, &b_dev_info->pages); + b_dev_info->isolated_pages--; + spin_unlock_irqrestore(&b_dev_info->pages_lock, flags); +} + +static inline int __migrate_balloon_page(struct address_space *mapping, + struct page *newpage, struct page *page, enum migrate_mode mode) +{ + return page->mapping->a_ops->migratepage(mapping, newpage, page, mode); +} + +/* __isolate_lru_page() counterpart for a ballooned page */ +bool balloon_page_isolate(struct page *page) +{ + /* + * Avoid burning cycles with pages that are yet under __free_pages(), + * or just got freed under us. + * + * In case we 'win' a race for a balloon page being freed under us and + * raise its refcount preventing __free_pages() from doing its job + * the put_page() at the end of this block will take care of + * release this page, thus avoiding a nasty leakage. + */ + if (likely(get_page_unless_zero(page))) { + /* + * As balloon pages are not isolated from LRU lists, concurrent + * compaction threads can race against page migration functions + * as well as race against the balloon driver releasing a page. + * + * In order to avoid having an already isolated balloon page + * being (wrongly) re-isolated while it is under migration, + * or to avoid attempting to isolate pages being released by + * the balloon driver, lets be sure we have the page lock + * before proceeding with the balloon page isolation steps. + */ + if (likely(trylock_page(page))) { + /* + * A ballooned page, by default, has just one refcount. + * Prevent concurrent compaction threads from isolating + * an already isolated balloon page by refcount check. + */ + if (__is_movable_balloon_page(page) && + page_count(page) == 2) { + __isolate_balloon_page(page); + unlock_page(page); + return true; + } + unlock_page(page); + } + put_page(page); + } + return false; +} + +/* putback_lru_page() counterpart for a ballooned page */ +void balloon_page_putback(struct page *page) +{ + /* + * 'lock_page()' stabilizes the page and prevents races against + * concurrent isolation threads attempting to re-isolate it. + */ + lock_page(page); + + if (__is_movable_balloon_page(page)) { + __putback_balloon_page(page); + /* drop the extra ref count taken for page isolation */ + put_page(page); + } else { + WARN_ON(1); + dump_page(page); + } + unlock_page(page); +} + +/* move_to_new_page() counterpart for a ballooned page */ +int balloon_page_migrate(struct page *newpage, + struct page *page, enum migrate_mode mode) +{ + struct address_space *mapping; + int rc = -EAGAIN; + + /* + * Block others from accessing the 'newpage' when we get around to + * establishing additional references. We should be the only one + * holding a reference to the 'newpage' at this point. + */ + BUG_ON(!trylock_page(newpage)); + + if (WARN_ON(!__is_movable_balloon_page(page))) { + dump_page(page); + unlock_page(newpage); + return rc; + } + + mapping = page->mapping; + if (mapping) + rc = __migrate_balloon_page(mapping, newpage, page, mode); + + unlock_page(newpage); + return rc; +} +#endif /* CONFIG_BALLOON_COMPACTION */ diff --git a/mm/bootmem.c b/mm/bootmem.c index f468185b3b28..1324cd74faec 100644 --- a/mm/bootmem.c +++ b/mm/bootmem.c @@ -147,21 +147,21 @@ unsigned long __init init_bootmem(unsigned long start, unsigned long pages) /* * free_bootmem_late - free bootmem pages directly to page allocator - * @addr: starting address of the range + * @addr: starting physical address of the range * @size: size of the range in bytes * * This is only useful when the bootmem allocator has already been torn * down, but we are still initializing the system. Pages are given directly * to the page allocator, no bootmem metadata is updated because it is gone. */ -void __init free_bootmem_late(unsigned long addr, unsigned long size) +void __init free_bootmem_late(unsigned long physaddr, unsigned long size) { unsigned long cursor, end; - kmemleak_free_part(__va(addr), size); + kmemleak_free_part(__va(physaddr), size); - cursor = PFN_UP(addr); - end = PFN_DOWN(addr + size); + cursor = PFN_UP(physaddr); + end = PFN_DOWN(physaddr + size); for (; cursor < end; cursor++) { __free_pages_bootmem(pfn_to_page(cursor), 0); @@ -229,6 +229,22 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) return count; } +static void reset_node_lowmem_managed_pages(pg_data_t *pgdat) +{ + struct zone *z; + + /* + * In free_area_init_core(), highmem zone's managed_pages is set to + * present_pages, and bootmem allocator doesn't allocate from highmem + * zones. So there's no need to recalculate managed_pages because all + * highmem pages will be managed by the buddy system. Here highmem + * zone also includes highmem movable zone. + */ + for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) + if (!is_highmem(z)) + z->managed_pages = 0; +} + /** * free_all_bootmem_node - release a node's free pages to the buddy allocator * @pgdat: node to be released @@ -238,6 +254,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) { register_page_bootmem_info_node(pgdat); + reset_node_lowmem_managed_pages(pgdat); return free_all_bootmem_core(pgdat->bdata); } @@ -250,6 +267,10 @@ unsigned long __init free_all_bootmem(void) { unsigned long total_pages = 0; bootmem_data_t *bdata; + struct pglist_data *pgdat; + + for_each_online_pgdat(pgdat) + reset_node_lowmem_managed_pages(pgdat); list_for_each_entry(bdata, &bdata_list, list) total_pages += free_all_bootmem_core(bdata); @@ -377,21 +398,21 @@ void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, /** * free_bootmem - mark a page range as usable - * @addr: starting address of the range + * @addr: starting physical address of the range * @size: size of the range in bytes * * Partial pages will be considered reserved and left as they are. * * The range must be contiguous but may span node boundaries. */ -void __init free_bootmem(unsigned long addr, unsigned long size) +void __init free_bootmem(unsigned long physaddr, unsigned long size) { unsigned long start, end; - kmemleak_free_part(__va(addr), size); + kmemleak_free_part(__va(physaddr), size); - start = PFN_UP(addr); - end = PFN_DOWN(addr + size); + start = PFN_UP(physaddr); + end = PFN_DOWN(physaddr + size); mark_bootmem(start, end, 0, 0); } @@ -439,12 +460,6 @@ int __init reserve_bootmem(unsigned long addr, unsigned long size, return mark_bootmem(start, end, 1, flags); } -int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len, - int flags) -{ - return reserve_bootmem(phys, len, flags); -} - static unsigned long __init align_idx(struct bootmem_data *bdata, unsigned long idx, unsigned long step) { @@ -575,27 +590,6 @@ find_block: return NULL; } -static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata, - unsigned long size, unsigned long align, - unsigned long goal, unsigned long limit) -{ - if (WARN_ON_ONCE(slab_is_available())) - return kzalloc(size, GFP_NOWAIT); - -#ifdef CONFIG_HAVE_ARCH_BOOTMEM - { - bootmem_data_t *p_bdata; - - p_bdata = bootmem_arch_preferred_node(bdata, size, align, - goal, limit); - if (p_bdata) - return alloc_bootmem_bdata(p_bdata, size, align, - goal, limit); - } -#endif - return NULL; -} - static void * __init alloc_bootmem_core(unsigned long size, unsigned long align, unsigned long goal, @@ -604,9 +598,8 @@ static void * __init alloc_bootmem_core(unsigned long size, bootmem_data_t *bdata; void *region; - region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit); - if (region) - return region; + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc(size, GFP_NOWAIT); list_for_each_entry(bdata, &bdata_list, list) { if (goal && bdata->node_low_pfn <= PFN_DOWN(goal)) @@ -704,11 +697,9 @@ void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat, { void *ptr; + if (WARN_ON_ONCE(slab_is_available())) + return kzalloc(size, GFP_NOWAIT); again: - ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, - align, goal, limit); - if (ptr) - return ptr; /* do not panic in alloc_bootmem_bdata() */ if (limit && goal + size > limit) diff --git a/mm/compaction.c b/mm/compaction.c index aee7443a4d5a..5ad7f4f4d6f7 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -14,6 +14,7 @@ #include <linux/backing-dev.h> #include <linux/sysctl.h> #include <linux/sysfs.h> +#include <linux/balloon_compaction.h> #include "internal.h" #if defined CONFIG_COMPACTION || defined CONFIG_CMA @@ -214,60 +215,6 @@ static bool suitable_migration_target(struct page *page) return false; } -static void compact_capture_page(struct compact_control *cc) -{ - unsigned long flags; - int mtype, mtype_low, mtype_high; - - if (!cc->page || *cc->page) - return; - - /* - * For MIGRATE_MOVABLE allocations we capture a suitable page ASAP - * regardless of the migratetype of the freelist is is captured from. - * This is fine because the order for a high-order MIGRATE_MOVABLE - * allocation is typically at least a pageblock size and overall - * fragmentation is not impaired. Other allocation types must - * capture pages from their own migratelist because otherwise they - * could pollute other pageblocks like MIGRATE_MOVABLE with - * difficult to move pages and making fragmentation worse overall. - */ - if (cc->migratetype == MIGRATE_MOVABLE) { - mtype_low = 0; - mtype_high = MIGRATE_PCPTYPES; - } else { - mtype_low = cc->migratetype; - mtype_high = cc->migratetype + 1; - } - - /* Speculatively examine the free lists without zone lock */ - for (mtype = mtype_low; mtype < mtype_high; mtype++) { - int order; - for (order = cc->order; order < MAX_ORDER; order++) { - struct page *page; - struct free_area *area; - area = &(cc->zone->free_area[order]); - if (list_empty(&area->free_list[mtype])) - continue; - - /* Take the lock and attempt capture of the page */ - if (!compact_trylock_irqsave(&cc->zone->lock, &flags, cc)) - return; - if (!list_empty(&area->free_list[mtype])) { - page = list_entry(area->free_list[mtype].next, - struct page, lru); - if (capture_free_page(page, cc->order, mtype)) { - spin_unlock_irqrestore(&cc->zone->lock, - flags); - *cc->page = page; - return; - } - } - spin_unlock_irqrestore(&cc->zone->lock, flags); - } - } -} - /* * Isolate free pages onto a private freelist. Caller must hold zone->lock. * If @strict is true, will abort returning 0 on any invalid PFNs or non-free @@ -569,9 +516,24 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, goto next_pageblock; } - /* Check may be lockless but that's ok as we recheck later */ - if (!PageLRU(page)) + /* + * Check may be lockless but that's ok as we recheck later. + * It's possible to migrate LRU pages and balloon pages + * Skip any other type of page + */ + if (!PageLRU(page)) { + if (unlikely(balloon_page_movable(page))) { + if (locked && balloon_page_isolate(page)) { + /* Successfully isolated */ + cc->finished_update_migrate = true; + list_add(&page->lru, migratelist); + cc->nr_migratepages++; + nr_isolated++; + goto check_compact_cluster; + } + } continue; + } /* * PageLRU is set. lru_lock normally excludes isolation @@ -625,6 +587,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, cc->nr_migratepages++; nr_isolated++; +check_compact_cluster: /* Avoid isolating too much */ if (cc->nr_migratepages == COMPACT_CLUSTER_MAX) { ++low_pfn; @@ -721,7 +684,15 @@ static void isolate_freepages(struct zone *zone, /* Found a block suitable for isolating free pages from */ isolated = 0; - end_pfn = min(pfn + pageblock_nr_pages, zone_end_pfn); + + /* + * As pfn may not start aligned, pfn+pageblock_nr_page + * may cross a MAX_ORDER_NR_PAGES boundary and miss + * a pfn_valid check. Ensure isolate_freepages_block() + * only scans within a pageblock + */ + end_pfn = ALIGN(pfn + 1, pageblock_nr_pages); + end_pfn = min(end_pfn, zone_end_pfn); isolated = isolate_freepages_block(cc, pfn, end_pfn, freelist, false); nr_freepages += isolated; @@ -936,6 +907,60 @@ unsigned long compaction_suitable(struct zone *zone, int order) return COMPACT_CONTINUE; } +static void compact_capture_page(struct compact_control *cc) +{ + unsigned long flags; + int mtype, mtype_low, mtype_high; + + if (!cc->page || *cc->page) + return; + + /* + * For MIGRATE_MOVABLE allocations we capture a suitable page ASAP + * regardless of the migratetype of the freelist is is captured from. + * This is fine because the order for a high-order MIGRATE_MOVABLE + * allocation is typically at least a pageblock size and overall + * fragmentation is not impaired. Other allocation types must + * capture pages from their own migratelist because otherwise they + * could pollute other pageblocks like MIGRATE_MOVABLE with + * difficult to move pages and making fragmentation worse overall. + */ + if (cc->migratetype == MIGRATE_MOVABLE) { + mtype_low = 0; + mtype_high = MIGRATE_PCPTYPES; + } else { + mtype_low = cc->migratetype; + mtype_high = cc->migratetype + 1; + } + + /* Speculatively examine the free lists without zone lock */ + for (mtype = mtype_low; mtype < mtype_high; mtype++) { + int order; + for (order = cc->order; order < MAX_ORDER; order++) { + struct page *page; + struct free_area *area; + area = &(cc->zone->free_area[order]); + if (list_empty(&area->free_list[mtype])) + continue; + + /* Take the lock and attempt capture of the page */ + if (!compact_trylock_irqsave(&cc->zone->lock, &flags, cc)) + return; + if (!list_empty(&area->free_list[mtype])) { + page = list_entry(area->free_list[mtype].next, + struct page, lru); + if (capture_free_page(page, cc->order, mtype)) { + spin_unlock_irqrestore(&cc->zone->lock, + flags); + *cc->page = page; + return; + } + } + spin_unlock_irqrestore(&cc->zone->lock, flags); + } + } +} + static int compact_zone(struct zone *zone, struct compact_control *cc) { int ret; @@ -986,7 +1011,7 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) switch (isolate_migratepages(zone, cc)) { case ISOLATE_ABORT: ret = COMPACT_PARTIAL; - putback_lru_pages(&cc->migratepages); + putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; goto out; case ISOLATE_NONE: @@ -1006,9 +1031,9 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) trace_mm_compaction_migratepages(nr_migrate - nr_remaining, nr_remaining); - /* Release LRU pages not migrated */ + /* Release isolated pages not migrated */ if (err) { - putback_lru_pages(&cc->migratepages); + putback_movable_pages(&cc->migratepages); cc->nr_migratepages = 0; if (err == -ENOMEM) { ret = COMPACT_PARTIAL; diff --git a/mm/dmapool.c b/mm/dmapool.c index c5ab33bca0a8..c69781e97cf9 100644 --- a/mm/dmapool.c +++ b/mm/dmapool.c @@ -50,7 +50,6 @@ struct dma_pool { /* the pool */ size_t allocation; size_t boundary; char name[32]; - wait_queue_head_t waitq; struct list_head pools; }; @@ -62,8 +61,6 @@ struct dma_page { /* cacheable header for 'allocation' bytes |