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author | Domenico Cerasuolo <cerasuolodomenico@gmail.com> | 2023-06-12 11:38:13 +0200 |
---|---|---|
committer | Andrew Morton <akpm@linux-foundation.org> | 2023-06-19 16:19:27 -0700 |
commit | 35499e2b79ffc51ea704c3268a5830164825a43e (patch) | |
tree | 9e1aac1e167af37df076f2f5b3a2cd81f6dfdcc5 | |
parent | b3067742ae36b36b959835a33937c4dc458f8183 (diff) | |
download | linux-35499e2b79ffc51ea704c3268a5830164825a43e.tar.gz linux-35499e2b79ffc51ea704c3268a5830164825a43e.tar.bz2 linux-35499e2b79ffc51ea704c3268a5830164825a43e.zip |
mm: zswap: remove shrink from zpool interface
Now that all three zswap backends have removed their shrink code, it is
no longer necessary for the zpool interface to include shrink/writeback
endpoints.
Link: https://lkml.kernel.org/r/20230612093815.133504-6-cerasuolodomenico@gmail.com
Signed-off-by: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Reviewed-by: Yosry Ahmed <yosryahmed@google.com>
Acked-by: Nhat Pham <nphamcs@gmail.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r-- | include/linux/zpool.h | 20 | ||||
-rw-r--r-- | mm/z3fold.c | 4 | ||||
-rw-r--r-- | mm/zbud.c | 4 | ||||
-rw-r--r-- | mm/zpool.c | 48 | ||||
-rw-r--r-- | mm/zsmalloc.c | 4 | ||||
-rw-r--r-- | mm/zswap.c | 27 |
6 files changed, 14 insertions, 93 deletions
diff --git a/include/linux/zpool.h b/include/linux/zpool.h index e8997010612a..3296438eec06 100644 --- a/include/linux/zpool.h +++ b/include/linux/zpool.h @@ -14,10 +14,6 @@ struct zpool; -struct zpool_ops { - int (*evict)(struct zpool *pool, unsigned long handle); -}; - /* * Control how a handle is mapped. It will be ignored if the * implementation does not support it. Its use is optional. @@ -39,8 +35,7 @@ enum zpool_mapmode { bool zpool_has_pool(char *type); -struct zpool *zpool_create_pool(const char *type, const char *name, - gfp_t gfp, const struct zpool_ops *ops); +struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp); const char *zpool_get_type(struct zpool *pool); @@ -53,9 +48,6 @@ int zpool_malloc(struct zpool *pool, size_t size, gfp_t gfp, void zpool_free(struct zpool *pool, unsigned long handle); -int zpool_shrink(struct zpool *pool, unsigned int pages, - unsigned int *reclaimed); - void *zpool_map_handle(struct zpool *pool, unsigned long handle, enum zpool_mapmode mm); @@ -72,7 +64,6 @@ u64 zpool_get_total_size(struct zpool *pool); * @destroy: destroy a pool. * @malloc: allocate mem from a pool. * @free: free mem from a pool. - * @shrink: shrink the pool. * @sleep_mapped: whether zpool driver can sleep during map. * @map: map a handle. * @unmap: unmap a handle. @@ -87,10 +78,7 @@ struct zpool_driver { atomic_t refcount; struct list_head list; - void *(*create)(const char *name, - gfp_t gfp, - const struct zpool_ops *ops, - struct zpool *zpool); + void *(*create)(const char *name, gfp_t gfp); void (*destroy)(void *pool); bool malloc_support_movable; @@ -98,9 +86,6 @@ struct zpool_driver { unsigned long *handle); void (*free)(void *pool, unsigned long handle); - int (*shrink)(void *pool, unsigned int pages, - unsigned int *reclaimed); - bool sleep_mapped; void *(*map)(void *pool, unsigned long handle, enum zpool_mapmode mm); @@ -113,7 +98,6 @@ void zpool_register_driver(struct zpool_driver *driver); int zpool_unregister_driver(struct zpool_driver *driver); -bool zpool_evictable(struct zpool *pool); bool zpool_can_sleep_mapped(struct zpool *pool); #endif diff --git a/mm/z3fold.c b/mm/z3fold.c index 238a214de59f..e84de91ecccb 100644 --- a/mm/z3fold.c +++ b/mm/z3fold.c @@ -1364,9 +1364,7 @@ static const struct movable_operations z3fold_mops = { * zpool ****************/ -static void *z3fold_zpool_create(const char *name, gfp_t gfp, - const struct zpool_ops *zpool_ops, - struct zpool *zpool) +static void *z3fold_zpool_create(const char *name, gfp_t gfp) { return z3fold_create_pool(name, gfp); } diff --git a/mm/zbud.c b/mm/zbud.c index 9d35fd4091ed..2190cc1f37b3 100644 --- a/mm/zbud.c +++ b/mm/zbud.c @@ -380,9 +380,7 @@ static u64 zbud_get_pool_size(struct zbud_pool *pool) * zpool ****************/ -static void *zbud_zpool_create(const char *name, gfp_t gfp, - const struct zpool_ops *zpool_ops, - struct zpool *zpool) +static void *zbud_zpool_create(const char *name, gfp_t gfp) { return zbud_create_pool(gfp); } diff --git a/mm/zpool.c b/mm/zpool.c index 6a19c4a58f77..846410479c2f 100644 --- a/mm/zpool.c +++ b/mm/zpool.c @@ -133,7 +133,6 @@ EXPORT_SYMBOL(zpool_has_pool); * @type: The type of the zpool to create (e.g. zbud, zsmalloc) * @name: The name of the zpool (e.g. zram0, zswap) * @gfp: The GFP flags to use when allocating the pool. - * @ops: The optional ops callback. * * This creates a new zpool of the specified type. The gfp flags will be * used when allocating memory, if the implementation supports it. If the @@ -145,8 +144,7 @@ EXPORT_SYMBOL(zpool_has_pool); * * Returns: New zpool on success, NULL on failure. */ -struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp, - const struct zpool_ops *ops) +struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp) { struct zpool_driver *driver; struct zpool *zpool; @@ -173,7 +171,7 @@ struct zpool *zpool_create_pool(const char *type, const char *name, gfp_t gfp, } zpool->driver = driver; - zpool->pool = driver->create(name, gfp, ops, zpool); + zpool->pool = driver->create(name, gfp); if (!zpool->pool) { pr_err("couldn't create %s pool\n", type); @@ -280,30 +278,6 @@ void zpool_free(struct zpool *zpool, unsigned long handle) } /** - * zpool_shrink() - Shrink the pool size - * @zpool: The zpool to shrink. - * @pages: The number of pages to shrink the pool. - * @reclaimed: The number of pages successfully evicted. - * - * This attempts to shrink the actual memory size of the pool - * by evicting currently used handle(s). If the pool was - * created with no zpool_ops, or the evict call fails for any - * of the handles, this will fail. If non-NULL, the @reclaimed - * parameter will be set to the number of pages reclaimed, - * which may be more than the number of pages requested. - * - * Implementations must guarantee this to be thread-safe. - * - * Returns: 0 on success, negative value on error/failure. - */ -int zpool_shrink(struct zpool *zpool, unsigned int pages, - unsigned int *reclaimed) -{ - return zpool->driver->shrink ? - zpool->driver->shrink(zpool->pool, pages, reclaimed) : -EINVAL; -} - -/** * zpool_map_handle() - Map a previously allocated handle into memory * @zpool: The zpool that the handle was allocated from * @handle: The handle to map @@ -360,24 +334,6 @@ u64 zpool_get_total_size(struct zpool *zpool) } /** - * zpool_evictable() - Test if zpool is potentially evictable - * @zpool: The zpool to test - * - * Zpool is only potentially evictable when it's created with struct - * zpool_ops.evict and its driver implements struct zpool_driver.shrink. - * - * However, it doesn't necessarily mean driver will use zpool_ops.evict - * in its implementation of zpool_driver.shrink. It could do internal - * defragmentation instead. - * - * Returns: true if potentially evictable; false otherwise. - */ -bool zpool_evictable(struct zpool *zpool) -{ - return zpool->driver->shrink; -} - -/** * zpool_can_sleep_mapped - Test if zpool can sleep when do mapped. * @zpool: The zpool to test * diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index e4d1ad521738..3f057970504e 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -351,9 +351,7 @@ static void record_obj(unsigned long handle, unsigned long obj) #ifdef CONFIG_ZPOOL -static void *zs_zpool_create(const char *name, gfp_t gfp, - const struct zpool_ops *zpool_ops, - struct zpool *zpool) +static void *zs_zpool_create(const char *name, gfp_t gfp) { /* * Ignore global gfp flags: zs_malloc() may be invoked from diff --git a/mm/zswap.c b/mm/zswap.c index 0024ec5ed574..a4f8c20e161b 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -258,10 +258,6 @@ static int zswap_writeback_entry(struct zpool *pool, unsigned long handle); static int zswap_pool_get(struct zswap_pool *pool); static void zswap_pool_put(struct zswap_pool *pool); -static const struct zpool_ops zswap_zpool_ops = { - .evict = zswap_writeback_entry -}; - static bool zswap_is_full(void) { return totalram_pages() * zswap_max_pool_percent / 100 < @@ -379,12 +375,9 @@ static void zswap_free_entry(struct zswap_entry *entry) if (!entry->length) atomic_dec(&zswap_same_filled_pages); else { - /* zpool_evictable will be removed once all 3 backends have migrated */ - if (!zpool_evictable(entry->pool->zpool)) { - spin_lock(&entry->pool->lru_lock); - list_del(&entry->lru); - spin_unlock(&entry->pool->lru_lock); - } + spin_lock(&entry->pool->lru_lock); + list_del(&entry->lru); + spin_unlock(&entry->pool->lru_lock); zpool_free(entry->pool->zpool, entry->handle); zswap_pool_put(entry->pool); } @@ -665,12 +658,8 @@ static void shrink_worker(struct work_struct *w) shrink_work); int ret, failures = 0; - /* zpool_evictable will be removed once all 3 backends have migrated */ do { - if (zpool_evictable(pool->zpool)) - ret = zpool_shrink(pool->zpool, 1, NULL); - else - ret = zswap_reclaim_entry(pool); + ret = zswap_reclaim_entry(pool); if (ret) { zswap_reject_reclaim_fail++; if (ret != -EAGAIN) @@ -708,7 +697,7 @@ static struct zswap_pool *zswap_pool_create(char *type, char *compressor) /* unique name for each pool specifically required by zsmalloc */ snprintf(name, 38, "zswap%x", atomic_inc_return(&zswap_pools_count)); - pool->zpool = zpool_create_pool(type, name, gfp, &zswap_zpool_ops); + pool->zpool = zpool_create_pool(type, name, gfp); if (!pool->zpool) { pr_err("%s zpool not available\n", type); goto error; @@ -1394,8 +1383,7 @@ insert_entry: zswap_entry_put(tree, dupentry); } } while (ret == -EEXIST); - /* zpool_evictable will be removed once all 3 backends have migrated */ - if (entry->length && !zpool_evictable(entry->pool->zpool)) { + if (entry->length) { spin_lock(&entry->pool->lru_lock); list_add(&entry->lru, &entry->pool->lru); spin_unlock(&entry->pool->lru_lock); @@ -1514,8 +1502,7 @@ freeentry: if (!ret && zswap_exclusive_loads_enabled) { zswap_invalidate_entry(tree, entry); *exclusive = true; - } else if (entry->length && !zpool_evictable(entry->pool->zpool)) { - /* zpool_evictable will be removed once all 3 backends have migrated */ + } else if (entry->length) { spin_lock(&entry->pool->lru_lock); list_move(&entry->lru, &entry->pool->lru); spin_unlock(&entry->pool->lru_lock); |