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authorGanesh Mahendran <opensource.ganesh@gmail.com>2015-02-12 15:00:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-12 18:54:12 -0800
commit3eba0c6a56c04f2b017b43641a821f1ebfb7fb4c (patch)
treeae8732c7012ccee1573769e2a686eb98df173bca
parentee98016010ae036a5b27300d83bd99ef3fd5776e (diff)
downloadop-kernel-dev-3eba0c6a56c04f2b017b43641a821f1ebfb7fb4c.zip
op-kernel-dev-3eba0c6a56c04f2b017b43641a821f1ebfb7fb4c.tar.gz
mm/zpool: add name argument to create zpool
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. 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>
-rw-r--r--drivers/block/zram/zram_drv.c8
-rw-r--r--include/linux/zpool.h5
-rw-r--r--include/linux/zsmalloc.h2
-rw-r--r--mm/zbud.c3
-rw-r--r--mm/zpool.c6
-rw-r--r--mm/zsmalloc.c6
-rw-r--r--mm/zswap.c5
7 files changed, 21 insertions, 14 deletions
diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index eca4b6727..8e233ed 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -327,9 +327,10 @@ 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)
@@ -342,7 +343,8 @@ 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;
@@ -783,7 +785,7 @@ 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;
diff --git a/include/linux/zpool.h b/include/linux/zpool.h
index f14bd75..56529b3 100644
--- a/include/linux/zpool.h
+++ b/include/linux/zpool.h
@@ -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,
diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h
index 05c2147..3283c6a 100644
--- a/include/linux/zsmalloc.h
+++ b/include/linux/zsmalloc.h
@@ -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);
diff --git a/mm/zbud.c b/mm/zbud.c
index 4e387be..2ee4e45 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -130,7 +130,8 @@ static struct zbud_ops zbud_zpool_ops = {
.evict = zbud_zpool_evict
};
-static void *zbud_zpool_create(gfp_t gfp, struct zpool_ops *zpool_ops)
+static void *zbud_zpool_create(char *name, gfp_t gfp,
+ struct zpool_ops *zpool_ops)
{
return zbud_create_pool(gfp, zpool_ops ? &zbud_zpool_ops : NULL);
}
diff --git a/mm/zpool.c b/mm/zpool.c
index 739cdf0..bacdab6 100644
--- a/mm/zpool.c
+++ b/mm/zpool.c
@@ -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) {
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index b724039..2359e61 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -246,9 +246,9 @@ 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)
@@ -1148,7 +1148,7 @@ 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;
diff --git a/mm/zswap.c b/mm/zswap.c
index 0cfce9b..4249e82f 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -906,11 +906,12 @@ static int __init init_zswap(void)
pr_info("loading zswap\n");
- zswap_pool = zpool_create_pool(zswap_zpool_type, gfp, &zswap_zpool_ops);
+ zswap_pool = zpool_create_pool(zswap_zpool_type, "zswap", gfp,
+ &zswap_zpool_ops);
if (!zswap_pool && strcmp(zswap_zpool_type, ZSWAP_ZPOOL_DEFAULT)) {
pr_info("%s zpool not available\n", zswap_zpool_type);
zswap_zpool_type = ZSWAP_ZPOOL_DEFAULT;
- zswap_pool = zpool_create_pool(zswap_zpool_type, gfp,
+ zswap_pool = zpool_create_pool(zswap_zpool_type, "zswap", gfp,
&zswap_zpool_ops);
}
if (!zswap_pool) {
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