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zsmalloc: require GFP in zs_malloc() 

Pass GFP flags to zs_malloc() instead of using a fixed mask supplied to
zs_create_pool(), so we can be more flexible, but, more importantly, we
need this to switch zram to per-cpu compression streams -- zram will try
to allocate handle with preemption disabled in a fast path and switch to
a slow path (using different gfp mask) if the fast one has failed.

Apart from that, this also align zs_malloc() interface with zspool/zbud.

[sergey.senozhatsky@gmail.com: pass GFP flags to zs_malloc() instead of using a fixed mask]
  Link: http://lkml.kernel.org/r/20160429150942.GA637@swordfish
Link: http://lkml.kernel.org/r/20160429150942.GA637@swordfish
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sergey Senozhatsky 2016-05-20 16:59:48 -07:00 committed by Linus Torvalds
parent 1ee4716585
commit d0d8da2dc4
3 changed files with 17 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/block/zram/zram_drv.c
View File

@ -514,7 +514,7 @@ static struct zram_meta *zram_meta_alloc(char *pool_name, u64 disksize)
goto out_error;
}
meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM);
meta->mem_pool = zs_create_pool(pool_name);
if (!meta->mem_pool) {
pr_err("Error creating memory pool\n");
goto out_error;
@ -717,7 +717,7 @@ static int zram_bvec_write(struct zram *zram, struct bio_vec *bvec, u32 index,
src = uncmem;
}
handle = zs_malloc(meta->mem_pool, clen);
handle = zs_malloc(meta->mem_pool, clen, GFP_NOIO | __GFP_HIGHMEM);
if (!handle) {
pr_err("Error allocating memory for compressed page: %u, size=%zu\n",
index, clen);

4
include/linux/zsmalloc.h
View File

@ -41,10 +41,10 @@ struct zs_pool_stats {
struct zs_pool;
struct zs_pool *zs_create_pool(const char *name, gfp_t flags);
struct zs_pool *zs_create_pool(const char *name);
void zs_destroy_pool(struct zs_pool *pool);
unsigned long zs_malloc(struct zs_pool *pool, size_t size);
unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags);
void zs_free(struct zs_pool *pool, unsigned long obj);
void *zs_map_object(struct zs_pool *pool, unsigned long handle,

24
mm/zsmalloc.c
View File

@ -247,7 +247,6 @@ struct zs_pool {
struct size_class **size_class;
struct kmem_cache *handle_cachep;
gfp_t flags; /* allocation flags used when growing pool */
atomic_long_t pages_allocated;
struct zs_pool_stats stats;
@ -295,10 +294,10 @@ static void destroy_handle_cache(struct zs_pool *pool)
kmem_cache_destroy(pool->handle_cachep);
}
static unsigned long alloc_handle(struct zs_pool *pool)
static unsigned long alloc_handle(struct zs_pool *pool, gfp_t gfp)
{
return (unsigned long)kmem_cache_alloc(pool->handle_cachep,
pool->flags & ~__GFP_HIGHMEM);
gfp & ~__GFP_HIGHMEM);
}
static void free_handle(struct zs_pool *pool, unsigned long handle)
@ -324,7 +323,12 @@ static void *zs_zpool_create(const char *name, gfp_t gfp,
const struct zpool_ops *zpool_ops,
struct zpool *zpool)
{
return zs_create_pool(name, gfp);
/*
* Ignore global gfp flags: zs_malloc() may be invoked from
* different contexts and its caller must provide a valid
* gfp mask.
*/
return zs_create_pool(name);
}
static void zs_zpool_destroy(void *pool)
@ -335,7 +339,7 @@ static void zs_zpool_destroy(void *pool)
static int zs_zpool_malloc(void *pool, size_t size, gfp_t gfp,
unsigned long *handle)
{
*handle = zs_malloc(pool, size);
*handle = zs_malloc(pool, size, gfp);
return *handle ? 0 : -1;
}
static void zs_zpool_free(void *pool, unsigned long handle)
@ -1391,7 +1395,7 @@ static unsigned long obj_malloc(struct size_class *class,
* otherwise 0.
* Allocation requests with size > ZS_MAX_ALLOC_SIZE will fail.
*/
unsigned long zs_malloc(struct zs_pool *pool, size_t size)
unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t gfp)
{
unsigned long handle, obj;
struct size_class *class;
@ -1400,7 +1404,7 @@ unsigned long zs_malloc(struct zs_pool *pool, size_t size)
if (unlikely(!size || size > ZS_MAX_ALLOC_SIZE))
return 0;
handle = alloc_handle(pool);
handle = alloc_handle(pool, gfp);
if (!handle)
return 0;
@ -1413,7 +1417,7 @@ unsigned long zs_malloc(struct zs_pool *pool, size_t size)
if (!first_page) {
spin_unlock(&class->lock);
first_page = alloc_zspage(class, pool->flags);
first_page = alloc_zspage(class, gfp);
if (unlikely(!first_page)) {
free_handle(pool, handle);
return 0;
@ -1878,7 +1882,7 @@ static int zs_register_shrinker(struct zs_pool *pool)
* On success, a pointer to the newly created pool is returned,
* otherwise NULL.
*/
struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
struct zs_pool *zs_create_pool(const char *name)
{
int i;
struct zs_pool *pool;
@ -1948,8 +1952,6 @@ struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
prev_class = class;
}
pool->flags = flags;
if (zs_pool_stat_create(pool, name))
goto err;