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BACKPORT: mm/zpool: add name argument to create zpool 

(cherry-pick from commit 3eba0c6a56c04f2b017b43641a821f1ebfb7fb4c)

Currently the underlay of zpool: zsmalloc/zbud, do not know who creates
them.  There is not a method to let zsmalloc/zbud find which caller they
belong to.

Now we want to add statistics collection in zsmalloc.  We need to name the
debugfs dir for each pool created.  The way suggested by Minchan Kim is to
use a name passed by caller(such as zram) to create the zsmalloc pool.

    /sys/kernel/debug/zsmalloc/zram0

This patch adds an argument `name' to zs_create_pool() and other related
functions.

Bug: 25951511

Change-Id: Ib71e8e63c71e808795073bd08c0aab14b43b4c35
Signed-off-by: Ganesh Mahendran <opensource.ganesh@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Seth Jennings <sjennings@variantweb.net>
Cc: Nitin Gupta <ngupta@vflare.org>
Cc: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ganesh Mahendran 2015-02-12 15:00:51 -08:00 committed by Artem Borisov
parent f877346638
commit 8dbc4dad5c
5 changed files with 16 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/block/zram/zram_drv.c
View File

@ -328,9 +328,10 @@ static void zram_meta_free(struct zram_meta *meta, u64 disksize)
kfree(meta);
}
static struct zram_meta *zram_meta_alloc(u64 disksize)
static struct zram_meta *zram_meta_alloc(int device_id, u64 disksize)
{
size_t num_pages;
char pool_name[8];
struct zram_meta *meta = kmalloc(sizeof(*meta), GFP_KERNEL);
if (!meta)
@ -343,7 +344,8 @@ static struct zram_meta *zram_meta_alloc(u64 disksize)
goto out_error;
}
meta->mem_pool = zs_create_pool(GFP_NOIO | __GFP_HIGHMEM);
snprintf(pool_name, sizeof(pool_name), "zram%d", device_id);
meta->mem_pool = zs_create_pool(pool_name, GFP_NOIO | __GFP_HIGHMEM);
if (!meta->mem_pool) {
pr_err("Error creating memory pool\n");
goto out_error;
@ -784,7 +786,7 @@ static ssize_t disksize_store(struct device *dev,
return -EINVAL;
disksize = PAGE_ALIGN(disksize);
meta = zram_meta_alloc(disksize);
meta = zram_meta_alloc(zram->disk->first_minor, disksize);
if (!meta)
return -ENOMEM;

5
include/linux/zpool.h
View File

@ -36,7 +36,8 @@ enum zpool_mapmode {
ZPOOL_MM_DEFAULT = ZPOOL_MM_RW
};
struct zpool *zpool_create_pool(char *type, gfp_t gfp, struct zpool_ops *ops);
struct zpool *zpool_create_pool(char *type, char *name,
gfp_t gfp, struct zpool_ops *ops);
char *zpool_get_type(struct zpool *pool);
@ -80,7 +81,7 @@ struct zpool_driver {
atomic_t refcount;
struct list_head list;
void *(*create)(gfp_t gfp, struct zpool_ops *ops);
void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops);
void (*destroy)(void *pool);
int (*malloc)(void *pool, size_t size, gfp_t gfp,

2
include/linux/zsmalloc.h
View File

@ -36,7 +36,7 @@ enum zs_mapmode {
struct zs_pool;
struct zs_pool *zs_create_pool(gfp_t flags);
struct zs_pool *zs_create_pool(char *name, gfp_t flags);
void zs_destroy_pool(struct zs_pool *pool);
unsigned long zs_malloc(struct zs_pool *pool, size_t size);

6
mm/zpool.c
View File

@ -129,6 +129,7 @@ static void zpool_put_driver(struct zpool_driver *driver)
/**
* zpool_create_pool() - Create a new zpool
* @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.
*
@ -140,7 +141,8 @@ static void zpool_put_driver(struct zpool_driver *driver)
*
* Returns: New zpool on success, NULL on failure.
*/
struct zpool *zpool_create_pool(char *type, gfp_t gfp, struct zpool_ops *ops)
struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp,
struct zpool_ops *ops)
{
struct zpool_driver *driver;
struct zpool *zpool;
@ -168,7 +170,7 @@ struct zpool *zpool_create_pool(char *type, gfp_t gfp, struct zpool_ops *ops)
zpool->type = driver->type;
zpool->driver = driver;
zpool->pool = driver->create(gfp, ops);
zpool->pool = driver->create(name, gfp, ops);
zpool->ops = ops;
if (!zpool->pool) {

6
mm/zsmalloc.c
View File

@ -247,9 +247,9 @@ struct mapping_area {
#ifdef CONFIG_ZPOOL
static void *zs_zpool_create(gfp_t gfp, struct zpool_ops *zpool_ops)
static void *zs_zpool_create(char *name, gfp_t gfp, struct zpool_ops *zpool_ops)
{
return zs_create_pool(gfp);
return zs_create_pool(name, gfp);
}
static void zs_zpool_destroy(void *pool)
@ -1149,7 +1149,7 @@ EXPORT_SYMBOL_GPL(zs_free);
* On success, a pointer to the newly created pool is returned,
* otherwise NULL.
*/
struct zs_pool *zs_create_pool(gfp_t flags)
struct zs_pool *zs_create_pool(char *name, gfp_t flags)
{
int i;
struct zs_pool *pool;