+// SPDX-License-Identifier: GPL-2.0-only
/*
* z3fold.c
*
#include <linux/atomic.h>
#include <linux/sched.h>
+#include <linux/cpumask.h>
+#include <linux/dcache.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
+#include <linux/page-flags.h>
+#include <linux/migrate.h>
+#include <linux/node.h>
+#include <linux/compaction.h>
#include <linux/percpu.h>
+#include <linux/mount.h>
+#include <linux/fs.h>
#include <linux/preempt.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/zpool.h>
+/*
+ * NCHUNKS_ORDER determines the internal allocation granularity, effectively
+ * adjusting internal fragmentation. It also determines the number of
+ * freelists maintained in each pool. NCHUNKS_ORDER of 6 means that the
+ * allocation granularity will be in chunks of size PAGE_SIZE/64. Some chunks
+ * in the beginning of an allocated page are occupied by z3fold header, so
+ * NCHUNKS will be calculated to 63 (or 62 in case CONFIG_DEBUG_SPINLOCK=y),
+ * which shows the max number of free chunks in z3fold page, also there will
+ * be 63, or 62, respectively, freelists per pool.
+ */
+#define NCHUNKS_ORDER 6
+
+#define CHUNK_SHIFT (PAGE_SHIFT - NCHUNKS_ORDER)
+#define CHUNK_SIZE (1 << CHUNK_SHIFT)
+#define ZHDR_SIZE_ALIGNED round_up(sizeof(struct z3fold_header), CHUNK_SIZE)
+#define ZHDR_CHUNKS (ZHDR_SIZE_ALIGNED >> CHUNK_SHIFT)
+#define TOTAL_CHUNKS (PAGE_SIZE >> CHUNK_SHIFT)
+#define NCHUNKS ((PAGE_SIZE - ZHDR_SIZE_ALIGNED) >> CHUNK_SHIFT)
+
+#define BUDDY_MASK (0x3)
+#define BUDDY_SHIFT 2
+#define SLOTS_ALIGN (0x40)
+
/*****************
* Structures
*****************/
FIRST,
MIDDLE,
LAST,
- BUDDIES_MAX
+ BUDDIES_MAX = LAST
+};
+
+struct z3fold_buddy_slots {
+ /*
+ * we are using BUDDY_MASK in handle_to_buddy etc. so there should
+ * be enough slots to hold all possible variants
+ */
+ unsigned long slot[BUDDY_MASK + 1];
+ unsigned long pool; /* back link + flags */
};
+#define HANDLE_FLAG_MASK (0x03)
/*
* struct z3fold_header - z3fold page metadata occupying first chunks of each
* @page_lock: per-page lock
* @refcount: reference count for the z3fold page
* @work: work_struct for page layout optimization
- * @pool: pointer to the pool which this page belongs to
+ * @slots: pointer to the structure holding buddy slots
* @cpu: CPU which this page "belongs" to
* @first_chunks: the size of the first buddy in chunks, 0 if free
* @middle_chunks: the size of the middle buddy in chunks, 0 if free
* @last_chunks: the size of the last buddy in chunks, 0 if free
* @first_num: the starting number (for the first handle)
+ * @mapped_count: the number of objects currently mapped
*/
struct z3fold_header {
struct list_head buddy;
spinlock_t page_lock;
struct kref refcount;
struct work_struct work;
- struct z3fold_pool *pool;
+ struct z3fold_buddy_slots *slots;
short cpu;
unsigned short first_chunks;
unsigned short middle_chunks;
unsigned short last_chunks;
unsigned short start_middle;
unsigned short first_num:2;
+ unsigned short mapped_count:2;
};
-/*
- * NCHUNKS_ORDER determines the internal allocation granularity, effectively
- * adjusting internal fragmentation. It also determines the number of
- * freelists maintained in each pool. NCHUNKS_ORDER of 6 means that the
- * allocation granularity will be in chunks of size PAGE_SIZE/64. Some chunks
- * in the beginning of an allocated page are occupied by z3fold header, so
- * NCHUNKS will be calculated to 63 (or 62 in case CONFIG_DEBUG_SPINLOCK=y),
- * which shows the max number of free chunks in z3fold page, also there will
- * be 63, or 62, respectively, freelists per pool.
- */
-#define NCHUNKS_ORDER 6
-
-#define CHUNK_SHIFT (PAGE_SHIFT - NCHUNKS_ORDER)
-#define CHUNK_SIZE (1 << CHUNK_SHIFT)
-#define ZHDR_SIZE_ALIGNED round_up(sizeof(struct z3fold_header), CHUNK_SIZE)
-#define ZHDR_CHUNKS (ZHDR_SIZE_ALIGNED >> CHUNK_SHIFT)
-#define TOTAL_CHUNKS (PAGE_SIZE >> CHUNK_SHIFT)
-#define NCHUNKS ((PAGE_SIZE - ZHDR_SIZE_ALIGNED) >> CHUNK_SHIFT)
-
-#define BUDDY_MASK (0x3)
-#define BUDDY_SHIFT 2
-
/**
* struct z3fold_pool - stores metadata for each z3fold pool
* @name: pool name
* added buddy.
* @stale: list of pages marked for freeing
* @pages_nr: number of z3fold pages in the pool.
+ * @c_handle: cache for z3fold_buddy_slots allocation
* @ops: pointer to a structure of user defined operations specified at
* pool creation time.
* @compact_wq: workqueue for page layout background optimization
* @release_wq: workqueue for safe page release
* @work: work_struct for safe page release
+ * @inode: inode for z3fold pseudo filesystem
*
* This structure is allocated at pool creation time and maintains metadata
* pertaining to a particular z3fold pool.
struct list_head lru;
struct list_head stale;
atomic64_t pages_nr;
+ struct kmem_cache *c_handle;
const struct z3fold_ops *ops;
struct zpool *zpool;
const struct zpool_ops *zpool_ops;
struct workqueue_struct *compact_wq;
struct workqueue_struct *release_wq;
struct work_struct work;
+ struct inode *inode;
};
/*
static void compact_page_work(struct work_struct *w);
+static inline struct z3fold_buddy_slots *alloc_slots(struct z3fold_pool *pool)
+{
+ struct z3fold_buddy_slots *slots = kmem_cache_alloc(pool->c_handle,
+ GFP_KERNEL);
+
+ if (slots) {
+ memset(slots->slot, 0, sizeof(slots->slot));
+ slots->pool = (unsigned long)pool;
+ }
+
+ return slots;
+}
+
+static inline struct z3fold_pool *slots_to_pool(struct z3fold_buddy_slots *s)
+{
+ return (struct z3fold_pool *)(s->pool & ~HANDLE_FLAG_MASK);
+}
+
+static inline struct z3fold_buddy_slots *handle_to_slots(unsigned long handle)
+{
+ return (struct z3fold_buddy_slots *)(handle & ~(SLOTS_ALIGN - 1));
+}
+
+static inline void free_handle(unsigned long handle)
+{
+ struct z3fold_buddy_slots *slots;
+ int i;
+ bool is_free;
+
+ if (handle & (1 << PAGE_HEADLESS))
+ return;
+
+ WARN_ON(*(unsigned long *)handle == 0);
+ *(unsigned long *)handle = 0;
+ slots = handle_to_slots(handle);
+ is_free = true;
+ for (i = 0; i <= BUDDY_MASK; i++) {
+ if (slots->slot[i]) {
+ is_free = false;
+ break;
+ }
+ }
+
+ if (is_free) {
+ struct z3fold_pool *pool = slots_to_pool(slots);
+
+ kmem_cache_free(pool->c_handle, slots);
+ }
+}
+
+static struct dentry *z3fold_do_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ static const struct dentry_operations ops = {
+ .d_dname = simple_dname,
+ };
+
+ return mount_pseudo(fs_type, "z3fold:", NULL, &ops, 0x33);
+}
+
+static struct file_system_type z3fold_fs = {
+ .name = "z3fold",
+ .mount = z3fold_do_mount,
+ .kill_sb = kill_anon_super,
+};
+
+static struct vfsmount *z3fold_mnt;
+static int z3fold_mount(void)
+{
+ int ret = 0;
+
+ z3fold_mnt = kern_mount(&z3fold_fs);
+ if (IS_ERR(z3fold_mnt))
+ ret = PTR_ERR(z3fold_mnt);
+
+ return ret;
+}
+
+static void z3fold_unmount(void)
+{
+ kern_unmount(z3fold_mnt);
+}
+
+static const struct address_space_operations z3fold_aops;
+static int z3fold_register_migration(struct z3fold_pool *pool)
+{
+ pool->inode = alloc_anon_inode(z3fold_mnt->mnt_sb);
+ if (IS_ERR(pool->inode)) {
+ pool->inode = NULL;
+ return 1;
+ }
+
+ pool->inode->i_mapping->private_data = pool;
+ pool->inode->i_mapping->a_ops = &z3fold_aops;
+ return 0;
+}
+
+static void z3fold_unregister_migration(struct z3fold_pool *pool)
+{
+ if (pool->inode)
+ iput(pool->inode);
+ }
+
/* Initializes the z3fold header of a newly allocated z3fold page */
static struct z3fold_header *init_z3fold_page(struct page *page,
struct z3fold_pool *pool)
{
struct z3fold_header *zhdr = page_address(page);
+ struct z3fold_buddy_slots *slots = alloc_slots(pool);
+
+ if (!slots)
+ return NULL;
INIT_LIST_HEAD(&page->lru);
clear_bit(PAGE_HEADLESS, &page->private);
zhdr->first_num = 0;
zhdr->start_middle = 0;
zhdr->cpu = -1;
- zhdr->pool = pool;
+ zhdr->slots = slots;
INIT_LIST_HEAD(&zhdr->buddy);
INIT_WORK(&zhdr->work, compact_page_work);
return zhdr;
}
/* Resets the struct page fields and frees the page */
-static void free_z3fold_page(struct page *page)
+static void free_z3fold_page(struct page *page, bool headless)
{
+ if (!headless) {
+ lock_page(page);
+ __ClearPageMovable(page);
+ unlock_page(page);
+ }
+ ClearPagePrivate(page);
__free_page(page);
}
spin_unlock(&zhdr->page_lock);
}
+/* Helper function to build the index */
+static inline int __idx(struct z3fold_header *zhdr, enum buddy bud)
+{
+ return (bud + zhdr->first_num) & BUDDY_MASK;
+}
+
/*
* Encodes the handle of a particular buddy within a z3fold page
* Pool lock should be held as this function accesses first_num
*/
static unsigned long encode_handle(struct z3fold_header *zhdr, enum buddy bud)
{
- unsigned long handle;
+ struct z3fold_buddy_slots *slots;
+ unsigned long h = (unsigned long)zhdr;
+ int idx = 0;
- handle = (unsigned long)zhdr;
- if (bud != HEADLESS) {
- handle |= (bud + zhdr->first_num) & BUDDY_MASK;
- if (bud == LAST)
- handle |= (zhdr->last_chunks << BUDDY_SHIFT);
- }
- return handle;
+ /*
+ * For a headless page, its handle is its pointer with the extra
+ * PAGE_HEADLESS bit set
+ */
+ if (bud == HEADLESS)
+ return h | (1 << PAGE_HEADLESS);
+
+ /* otherwise, return pointer to encoded handle */
+ idx = __idx(zhdr, bud);
+ h += idx;
+ if (bud == LAST)
+ h |= (zhdr->last_chunks << BUDDY_SHIFT);
+
+ slots = zhdr->slots;
+ slots->slot[idx] = h;
+ return (unsigned long)&slots->slot[idx];
}
/* Returns the z3fold page where a given handle is stored */
-static struct z3fold_header *handle_to_z3fold_header(unsigned long handle)
+static inline struct z3fold_header *handle_to_z3fold_header(unsigned long h)
{
- return (struct z3fold_header *)(handle & PAGE_MASK);
+ unsigned long addr = h;
+
+ if (!(addr & (1 << PAGE_HEADLESS)))
+ addr = *(unsigned long *)h;
+
+ return (struct z3fold_header *)(addr & PAGE_MASK);
}
/* only for LAST bud, returns zero otherwise */
static unsigned short handle_to_chunks(unsigned long handle)
{
- return (handle & ~PAGE_MASK) >> BUDDY_SHIFT;
+ unsigned long addr = *(unsigned long *)handle;
+
+ return (addr & ~PAGE_MASK) >> BUDDY_SHIFT;
}
/*
*/
static enum buddy handle_to_buddy(unsigned long handle)
{
- struct z3fold_header *zhdr = handle_to_z3fold_header(handle);
- return (handle - zhdr->first_num) & BUDDY_MASK;
+ struct z3fold_header *zhdr;
+ unsigned long addr;
+
+ WARN_ON(handle & (1 << PAGE_HEADLESS));
+ addr = *(unsigned long *)handle;
+ zhdr = (struct z3fold_header *)(addr & PAGE_MASK);
+ return (addr - zhdr->first_num) & BUDDY_MASK;
+}
+
+static inline struct z3fold_pool *zhdr_to_pool(struct z3fold_header *zhdr)
+{
+ return slots_to_pool(zhdr->slots);
}
static void __release_z3fold_page(struct z3fold_header *zhdr, bool locked)
{
struct page *page = virt_to_page(zhdr);
- struct z3fold_pool *pool = zhdr->pool;
+ struct z3fold_pool *pool = zhdr_to_pool(zhdr);
WARN_ON(!list_empty(&zhdr->buddy));
set_bit(PAGE_STALE, &page->private);
clear_bit(NEEDS_COMPACTING, &page->private);
spin_lock(&pool->lock);
if (!list_empty(&page->lru))
- list_del(&page->lru);
+ list_del_init(&page->lru);
spin_unlock(&pool->lock);
if (locked)
z3fold_page_unlock(zhdr);
{
struct z3fold_header *zhdr = container_of(ref, struct z3fold_header,
refcount);
- spin_lock(&zhdr->pool->lock);
+ struct z3fold_pool *pool = zhdr_to_pool(zhdr);
+ spin_lock(&pool->lock);
list_del_init(&zhdr->buddy);
- spin_unlock(&zhdr->pool->lock);
+ spin_unlock(&pool->lock);
WARN_ON(z3fold_page_trylock(zhdr));
__release_z3fold_page(zhdr, true);
continue;
spin_unlock(&pool->stale_lock);
cancel_work_sync(&zhdr->work);
- free_z3fold_page(page);
+ free_z3fold_page(page, false);
cond_resched();
spin_lock(&pool->stale_lock);
}
return nfree;
}
+/* Add to the appropriate unbuddied list */
+static inline void add_to_unbuddied(struct z3fold_pool *pool,
+ struct z3fold_header *zhdr)
+{
+ if (zhdr->first_chunks == 0 || zhdr->last_chunks == 0 ||
+ zhdr->middle_chunks == 0) {
+ struct list_head *unbuddied = get_cpu_ptr(pool->unbuddied);
+
+ int freechunks = num_free_chunks(zhdr);
+ spin_lock(&pool->lock);
+ list_add(&zhdr->buddy, &unbuddied[freechunks]);
+ spin_unlock(&pool->lock);
+ zhdr->cpu = smp_processor_id();
+ put_cpu_ptr(pool->unbuddied);
+ }
+}
+
static inline void *mchunk_memmove(struct z3fold_header *zhdr,
unsigned short dst_chunk)
{
if (test_bit(MIDDLE_CHUNK_MAPPED, &page->private))
return 0; /* can't move middle chunk, it's used */
+ if (unlikely(PageIsolated(page)))
+ return 0;
+
if (zhdr->middle_chunks == 0)
return 0; /* nothing to compact */
static void do_compact_page(struct z3fold_header *zhdr, bool locked)
{
- struct z3fold_pool *pool = zhdr->pool;
+ struct z3fold_pool *pool = zhdr_to_pool(zhdr);
struct page *page;
- struct list_head *unbuddied;
- int fchunks;
page = virt_to_page(zhdr);
if (locked)
return;
}
- z3fold_compact_page(zhdr);
- unbuddied = get_cpu_ptr(pool->unbuddied);
- fchunks = num_free_chunks(zhdr);
- if (fchunks < NCHUNKS &&
- (!zhdr->first_chunks || !zhdr->middle_chunks ||
- !zhdr->last_chunks)) {
- /* the page's not completely free and it's unbuddied */
- spin_lock(&pool->lock);
- list_add(&zhdr->buddy, &unbuddied[fchunks]);
- spin_unlock(&pool->lock);
- zhdr->cpu = smp_processor_id();
+ if (unlikely(PageIsolated(page) ||
+ test_bit(PAGE_STALE, &page->private))) {
+ z3fold_page_unlock(zhdr);
+ return;
}
- put_cpu_ptr(pool->unbuddied);
+
+ z3fold_compact_page(zhdr);
+ add_to_unbuddied(pool, zhdr);
z3fold_page_unlock(zhdr);
}
do_compact_page(zhdr, false);
}
+/* returns _locked_ z3fold page header or NULL */
+static inline struct z3fold_header *__z3fold_alloc(struct z3fold_pool *pool,
+ size_t size, bool can_sleep)
+{
+ struct z3fold_header *zhdr = NULL;
+ struct page *page;
+ struct list_head *unbuddied;
+ int chunks = size_to_chunks(size), i;
+
+lookup:
+ /* First, try to find an unbuddied z3fold page. */
+ unbuddied = get_cpu_ptr(pool->unbuddied);
+ for_each_unbuddied_list(i, chunks) {
+ struct list_head *l = &unbuddied[i];
+
+ zhdr = list_first_entry_or_null(READ_ONCE(l),
+ struct z3fold_header, buddy);
+
+ if (!zhdr)
+ continue;
+
+ /* Re-check under lock. */
+ spin_lock(&pool->lock);
+ l = &unbuddied[i];
+ if (unlikely(zhdr != list_first_entry(READ_ONCE(l),
+ struct z3fold_header, buddy)) ||
+ !z3fold_page_trylock(zhdr)) {
+ spin_unlock(&pool->lock);
+ zhdr = NULL;
+ put_cpu_ptr(pool->unbuddied);
+ if (can_sleep)
+ cond_resched();
+ goto lookup;
+ }
+ list_del_init(&zhdr->buddy);
+ zhdr->cpu = -1;
+ spin_unlock(&pool->lock);
+
+ page = virt_to_page(zhdr);
+ if (test_bit(NEEDS_COMPACTING, &page->private)) {
+ z3fold_page_unlock(zhdr);
+ zhdr = NULL;
+ put_cpu_ptr(pool->unbuddied);
+ if (can_sleep)
+ cond_resched();
+ goto lookup;
+ }
+
+ /*
+ * this page could not be removed from its unbuddied
+ * list while pool lock was held, and then we've taken
+ * page lock so kref_put could not be called before
+ * we got here, so it's safe to just call kref_get()
+ */
+ kref_get(&zhdr->refcount);
+ break;
+ }
+ put_cpu_ptr(pool->unbuddied);
+
+ if (!zhdr) {
+ int cpu;
+
+ /* look for _exact_ match on other cpus' lists */
+ for_each_online_cpu(cpu) {
+ struct list_head *l;
+
+ unbuddied = per_cpu_ptr(pool->unbuddied, cpu);
+ spin_lock(&pool->lock);
+ l = &unbuddied[chunks];
+
+ zhdr = list_first_entry_or_null(READ_ONCE(l),
+ struct z3fold_header, buddy);
+
+ if (!zhdr || !z3fold_page_trylock(zhdr)) {
+ spin_unlock(&pool->lock);
+ zhdr = NULL;
+ continue;
+ }
+ list_del_init(&zhdr->buddy);
+ zhdr->cpu = -1;
+ spin_unlock(&pool->lock);
+
+ page = virt_to_page(zhdr);
+ if (test_bit(NEEDS_COMPACTING, &page->private)) {
+ z3fold_page_unlock(zhdr);
+ zhdr = NULL;
+ if (can_sleep)
+ cond_resched();
+ continue;
+ }
+ kref_get(&zhdr->refcount);
+ break;
+ }
+ }
+
+ return zhdr;
+}
/*
* API Functions
pool = kzalloc(sizeof(struct z3fold_pool), gfp);
if (!pool)
goto out;
+ pool->c_handle = kmem_cache_create("z3fold_handle",
+ sizeof(struct z3fold_buddy_slots),
+ SLOTS_ALIGN, 0, NULL);
+ if (!pool->c_handle)
+ goto out_c;
spin_lock_init(&pool->lock);
spin_lock_init(&pool->stale_lock);
pool->unbuddied = __alloc_percpu(sizeof(struct list_head)*NCHUNKS, 2);
pool->release_wq = create_singlethread_workqueue(pool->name);
if (!pool->release_wq)
goto out_wq;
+ if (z3fold_register_migration(pool))
+ goto out_rwq;
INIT_WORK(&pool->work, free_pages_work);
pool->ops = ops;
return pool;
+out_rwq:
+ destroy_workqueue(pool->release_wq);
out_wq:
destroy_workqueue(pool->compact_wq);
out_unbuddied:
free_percpu(pool->unbuddied);
out_pool:
+ kmem_cache_destroy(pool->c_handle);
+out_c:
kfree(pool);
out:
return NULL;
*/
static void z3fold_destroy_pool(struct z3fold_pool *pool)
{
+ kmem_cache_destroy(pool->c_handle);
+ z3fold_unregister_migration(pool);
destroy_workqueue(pool->release_wq);
destroy_workqueue(pool->compact_wq);
kfree(pool);
static int z3fold_alloc(struct z3fold_pool *pool, size_t size, gfp_t gfp,
unsigned long *handle)
{
- int chunks = 0, i, freechunks;
+ int chunks = size_to_chunks(size);
struct z3fold_header *zhdr = NULL;
struct page *page = NULL;
enum buddy bud;
if (size > PAGE_SIZE - ZHDR_SIZE_ALIGNED - CHUNK_SIZE)
bud = HEADLESS;
else {
- struct list_head *unbuddied;
- chunks = size_to_chunks(size);
-
-lookup:
- /* First, try to find an unbuddied z3fold page. */
- unbuddied = get_cpu_ptr(pool->unbuddied);
- for_each_unbuddied_list(i, chunks) {
- struct list_head *l = &unbuddied[i];
-
- zhdr = list_first_entry_or_null(READ_ONCE(l),
- struct z3fold_header, buddy);
-
- if (!zhdr)
- continue;
-
- /* Re-check under lock. */
- spin_lock(&pool->lock);
- l = &unbuddied[i];
- if (unlikely(zhdr != list_first_entry(READ_ONCE(l),
- struct z3fold_header, buddy)) ||
- !z3fold_page_trylock(zhdr)) {
- spin_unlock(&pool->lock);
- put_cpu_ptr(pool->unbuddied);
- goto lookup;
- }
- list_del_init(&zhdr->buddy);
- zhdr->cpu = -1;
- spin_unlock(&pool->lock);
-
- page = virt_to_page(zhdr);
- if (test_bit(NEEDS_COMPACTING, &page->private)) {
- z3fold_page_unlock(zhdr);
- zhdr = NULL;
- put_cpu_ptr(pool->unbuddied);
- if (can_sleep)
- cond_resched();
- goto lookup;
- }
-
- /*
- * this page could not be removed from its unbuddied
- * list while pool lock was held, and then we've taken
- * page lock so kref_put could not be called before
- * we got here, so it's safe to just call kref_get()
- */
- kref_get(&zhdr->refcount);
- break;
- }
- put_cpu_ptr(pool->unbuddied);
-
+retry:
+ zhdr = __z3fold_alloc(pool, size, can_sleep);
if (zhdr) {
if (zhdr->first_chunks == 0) {
if (zhdr->middle_chunks != 0 &&
z3fold_page_unlock(zhdr);
pr_err("No free chunks in unbuddied\n");
WARN_ON(1);
- goto lookup;
+ goto retry;
}
+ page = virt_to_page(zhdr);
goto found;
}
bud = FIRST;
if (!page)
return -ENOMEM;
- atomic64_inc(&pool->pages_nr);
zhdr = init_z3fold_page(page, pool);
+ if (!zhdr) {
+ __free_page(page);
+ return -ENOMEM;
+ }
+ atomic64_inc(&pool->pages_nr);
if (bud == HEADLESS) {
set_bit(PAGE_HEADLESS, &page->private);
goto headless;
}
+ __SetPageMovable(page, pool->inode->i_mapping);
z3fold_page_lock(zhdr);
found:
zhdr->middle_chunks = chunks;
zhdr->start_middle = zhdr->first_chunks + ZHDR_CHUNKS;
}
-
- if (zhdr->first_chunks == 0 || zhdr->last_chunks == 0 ||
- zhdr->middle_chunks == 0) {
- struct list_head *unbuddied = get_cpu_ptr(pool->unbuddied);
-
- /* Add to unbuddied list */
- freechunks = num_free_chunks(zhdr);
- spin_lock(&pool->lock);
- list_add(&zhdr->buddy, &unbuddied[freechunks]);
- spin_unlock(&pool->lock);
- zhdr->cpu = smp_processor_id();
- put_cpu_ptr(pool->unbuddied);
- }
+ add_to_unbuddied(pool, zhdr);
headless:
spin_lock(&pool->lock);
spin_lock(&pool->lock);
list_del(&page->lru);
spin_unlock(&pool->lock);
- free_z3fold_page(page);
+ free_z3fold_page(page, true);
atomic64_dec(&pool->pages_nr);
}
return;
return;
}
+ free_handle(handle);
if (kref_put(&zhdr->refcount, release_z3fold_page_locked_list)) {
atomic64_dec(&pool->pages_nr);
return;
z3fold_page_unlock(zhdr);
return;
}
- if (test_and_set_bit(NEEDS_COMPACTING, &page->private)) {
+ if (unlikely(PageIsolated(page)) ||
+ test_and_set_bit(NEEDS_COMPACTING, &page->private)) {
z3fold_page_unlock(zhdr);
return;
}
if (test_and_set_bit(PAGE_CLAIMED, &page->private))
continue;
- zhdr = page_address(page);
+ if (unlikely(PageIsolated(page)))
+ continue;
if (test_bit(PAGE_HEADLESS, &page->private))
break;
+ zhdr = page_address(page);
if (!z3fold_page_trylock(zhdr)) {
zhdr = NULL;
continue; /* can't evict at this point */
next:
if (test_bit(PAGE_HEADLESS, &page->private)) {
if (ret == 0) {
- free_z3fold_page(page);
+ free_z3fold_page(page, true);
atomic64_dec(&pool->pages_nr);
return 0;
}
break;
}
+ if (addr)
+ zhdr->mapped_count++;
z3fold_page_unlock(zhdr);
out:
return addr;
buddy = handle_to_buddy(handle);
if (buddy == MIDDLE)
clear_bit(MIDDLE_CHUNK_MAPPED, &page->private);
+ zhdr->mapped_count--;
z3fold_page_unlock(zhdr);
}
return atomic64_read(&pool->pages_nr);
}
+static bool z3fold_page_isolate(struct page *page, isolate_mode_t mode)
+{
+ struct z3fold_header *zhdr;
+ struct z3fold_pool *pool;
+
+ VM_BUG_ON_PAGE(!PageMovable(page), page);
+ VM_BUG_ON_PAGE(PageIsolated(page), page);
+
+ if (test_bit(PAGE_HEADLESS, &page->private))
+ return false;
+
+ zhdr = page_address(page);
+ z3fold_page_lock(zhdr);
+ if (test_bit(NEEDS_COMPACTING, &page->private) ||
+ test_bit(PAGE_STALE, &page->private))
+ goto out;
+
+ pool = zhdr_to_pool(zhdr);
+
+ if (zhdr->mapped_count == 0) {
+ kref_get(&zhdr->refcount);
+ if (!list_empty(&zhdr->buddy))
+ list_del_init(&zhdr->buddy);
+ spin_lock(&pool->lock);
+ if (!list_empty(&page->lru))
+ list_del(&page->lru);
+ spin_unlock(&pool->lock);
+ z3fold_page_unlock(zhdr);
+ return true;
+ }
+out:
+ z3fold_page_unlock(zhdr);
+ return false;
+}
+
+static int z3fold_page_migrate(struct address_space *mapping, struct page *newpage,
+ struct page *page, enum migrate_mode mode)
+{
+ struct z3fold_header *zhdr, *new_zhdr;
+ struct z3fold_pool *pool;
+ struct address_space *new_mapping;
+
+ VM_BUG_ON_PAGE(!PageMovable(page), page);
+ VM_BUG_ON_PAGE(!PageIsolated(page), page);
+
+ zhdr = page_address(page);
+ pool = zhdr_to_pool(zhdr);
+
+ if (!trylock_page(page))
+ return -EAGAIN;
+
+ if (!z3fold_page_trylock(zhdr)) {
+ unlock_page(page);
+ return -EAGAIN;
+ }
+ if (zhdr->mapped_count != 0) {
+ z3fold_page_unlock(zhdr);
+ unlock_page(page);
+ return -EBUSY;
+ }
+ new_zhdr = page_address(newpage);
+ memcpy(new_zhdr, zhdr, PAGE_SIZE);
+ newpage->private = page->private;
+ page->private = 0;
+ z3fold_page_unlock(zhdr);
+ spin_lock_init(&new_zhdr->page_lock);
+ new_mapping = page_mapping(page);
+ __ClearPageMovable(page);
+ ClearPagePrivate(page);
+
+ get_page(newpage);
+ z3fold_page_lock(new_zhdr);
+ if (new_zhdr->first_chunks)
+ encode_handle(new_zhdr, FIRST);
+ if (new_zhdr->last_chunks)
+ encode_handle(new_zhdr, LAST);
+ if (new_zhdr->middle_chunks)
+ encode_handle(new_zhdr, MIDDLE);
+ set_bit(NEEDS_COMPACTING, &newpage->private);
+ new_zhdr->cpu = smp_processor_id();
+ spin_lock(&pool->lock);
+ list_add(&newpage->lru, &pool->lru);
+ spin_unlock(&pool->lock);
+ __SetPageMovable(newpage, new_mapping);
+ z3fold_page_unlock(new_zhdr);
+
+ queue_work_on(new_zhdr->cpu, pool->compact_wq, &new_zhdr->work);
+
+ page_mapcount_reset(page);
+ unlock_page(page);
+ put_page(page);
+ return 0;
+}
+
+static void z3fold_page_putback(struct page *page)
+{
+ struct z3fold_header *zhdr;
+ struct z3fold_pool *pool;
+
+ zhdr = page_address(page);
+ pool = zhdr_to_pool(zhdr);
+
+ z3fold_page_lock(zhdr);
+ if (!list_empty(&zhdr->buddy))
+ list_del_init(&zhdr->buddy);
+ INIT_LIST_HEAD(&page->lru);
+ if (kref_put(&zhdr->refcount, release_z3fold_page_locked)) {
+ atomic64_dec(&pool->pages_nr);
+ return;
+ }
+ spin_lock(&pool->lock);
+ list_add(&page->lru, &pool->lru);
+ spin_unlock(&pool->lock);
+ z3fold_page_unlock(zhdr);
+}
+
+static const struct address_space_operations z3fold_aops = {
+ .isolate_page = z3fold_page_isolate,
+ .migratepage = z3fold_page_migrate,
+ .putback_page = z3fold_page_putback,
+};
+
/*****************
* zpool
****************/
static int __init init_z3fold(void)
{
+ int ret;
+
/* Make sure the z3fold header is not larger than the page size */
BUILD_BUG_ON(ZHDR_SIZE_ALIGNED > PAGE_SIZE);
+ ret = z3fold_mount();
+ if (ret)
+ return ret;
+
zpool_register_driver(&z3fold_zpool_driver);
return 0;
static void __exit exit_z3fold(void)
{
+ z3fold_unmount();
zpool_unregister_driver(&z3fold_zpool_driver);
}
projects / linux.git / blobdiff