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Commit b9a06623 authored by Artem Bityutskiy's avatar Artem Bityutskiy
Browse files

UBI: get rid of ubi_ltree_slab 



This slab cache is not really needed since the number of objects
is low and the constructor does not make much sense because we
allocate oblects when doint I/O, which is way slower then allocation.

Suggested-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 4fac9f69

drivers/mtd/ubi/build.c

+1 −27
Original line number Diff line number Diff line
@@ -66,9 +66,6 @@ static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES]; 
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */

struct class *ubi_class;



/* Slab cache for lock-tree entries */

struct kmem_cache *ubi_ltree_slab;



/* Slab cache for wear-leveling entries */

struct kmem_cache *ubi_wl_entry_slab;
@@ -857,20 +854,6 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway) 
	return 0;

}



/**

 * ltree_entry_ctor - lock tree entries slab cache constructor.

 * @obj: the lock-tree entry to construct

 * @cache: the lock tree entry slab cache

 * @flags: constructor flags

 */

static void ltree_entry_ctor(struct kmem_cache *cache, void *obj)

{

	struct ubi_ltree_entry *le = obj;



	le->users = 0;

	init_rwsem(&le->mutex);

}



/**

 * find_mtd_device - open an MTD device by its name or number.

 * @mtd_dev: name or number of the device
@@ -933,17 +916,11 @@ static int __init ubi_init(void) 
		goto out_version;

	}



	ubi_ltree_slab = kmem_cache_create("ubi_ltree_slab",

					   sizeof(struct ubi_ltree_entry), 0,

					   0, &ltree_entry_ctor);

	if (!ubi_ltree_slab)

		goto out_dev_unreg;



	ubi_wl_entry_slab = kmem_cache_create("ubi_wl_entry_slab",

						sizeof(struct ubi_wl_entry),

						0, 0, NULL);

	if (!ubi_wl_entry_slab)

		goto out_ltree;

		goto out_dev_unreg;



	/* Attach MTD devices */

	for (i = 0; i < mtd_devs; i++) {
@@ -980,8 +957,6 @@ out_detach: 
			mutex_unlock(&ubi_devices_mutex);

		}

	kmem_cache_destroy(ubi_wl_entry_slab);

out_ltree:

	kmem_cache_destroy(ubi_ltree_slab);

out_dev_unreg:

	misc_deregister(&ubi_ctrl_cdev);

out_version:
@@ -1005,7 +980,6 @@ static void __exit ubi_exit(void) 
			mutex_unlock(&ubi_devices_mutex);

		}

	kmem_cache_destroy(ubi_wl_entry_slab);

	kmem_cache_destroy(ubi_ltree_slab);

	misc_deregister(&ubi_ctrl_cdev);

	class_remove_file(ubi_class, &ubi_version);

	class_destroy(ubi_class);

drivers/mtd/ubi/eba.c

+7 −5
Original line number Diff line number Diff line
@@ -137,10 +137,12 @@ static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi, 
{

	struct ubi_ltree_entry *le, *le1, *le_free;



	le = kmem_cache_alloc(ubi_ltree_slab, GFP_NOFS);

	le = kmalloc(sizeof(struct ubi_ltree_entry), GFP_NOFS);

	if (!le)

		return ERR_PTR(-ENOMEM);



	le->users = 0;

	init_rwsem(&le->mutex);

	le->vol_id = vol_id;

	le->lnum = lnum;
@@ -188,7 +190,7 @@ static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi, 
	spin_unlock(&ubi->ltree_lock);



	if (le_free)

		kmem_cache_free(ubi_ltree_slab, le_free);

		kfree(le_free);



	return le;

}
@@ -236,7 +238,7 @@ static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum) 


	up_read(&le->mutex);

	if (free)

		kmem_cache_free(ubi_ltree_slab, le);

		kfree(le);

}



/**
@@ -292,7 +294,7 @@ static int leb_write_trylock(struct ubi_device *ubi, int vol_id, int lnum) 
		free = 0;

	spin_unlock(&ubi->ltree_lock);

	if (free)

		kmem_cache_free(ubi_ltree_slab, le);

		kfree(le);



	return 1;

}
@@ -321,7 +323,7 @@ static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum) 


	up_write(&le->mutex);

	if (free)

		kmem_cache_free(ubi_ltree_slab, le);

		kfree(le);

}



/**

drivers/mtd/ubi/ubi.h

+0 −1
Original line number Diff line number Diff line
@@ -399,7 +399,6 @@ struct ubi_device { 
#endif

};



extern struct kmem_cache *ubi_ltree_slab;

extern struct kmem_cache *ubi_wl_entry_slab;

extern struct file_operations ubi_ctrl_cdev_operations;

extern struct file_operations ubi_cdev_operations;