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3eba0c6a56
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>
108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/*
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* zpool memory storage api
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*
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* Copyright (C) 2014 Dan Streetman
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*
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* This is a common frontend for the zbud and zsmalloc memory
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* storage pool implementations. Typically, this is used to
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* store compressed memory.
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*/
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#ifndef _ZPOOL_H_
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#define _ZPOOL_H_
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struct zpool;
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struct zpool_ops {
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int (*evict)(struct zpool *pool, unsigned long handle);
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};
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/*
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* Control how a handle is mapped. It will be ignored if the
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* implementation does not support it. Its use is optional.
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* Note that this does not refer to memory protection, it
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* refers to how the memory will be copied in/out if copying
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* is necessary during mapping; read-write is the safest as
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* it copies the existing memory in on map, and copies the
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* changed memory back out on unmap. Write-only does not copy
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* in the memory and should only be used for initialization.
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* If in doubt, use ZPOOL_MM_DEFAULT which is read-write.
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*/
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enum zpool_mapmode {
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ZPOOL_MM_RW, /* normal read-write mapping */
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ZPOOL_MM_RO, /* read-only (no copy-out at unmap time) */
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ZPOOL_MM_WO, /* write-only (no copy-in at map time) */
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ZPOOL_MM_DEFAULT = ZPOOL_MM_RW
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};
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struct zpool *zpool_create_pool(char *type, char *name,
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gfp_t gfp, struct zpool_ops *ops);
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char *zpool_get_type(struct zpool *pool);
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void zpool_destroy_pool(struct zpool *pool);
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int zpool_malloc(struct zpool *pool, size_t size, gfp_t gfp,
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unsigned long *handle);
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void zpool_free(struct zpool *pool, unsigned long handle);
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int zpool_shrink(struct zpool *pool, unsigned int pages,
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unsigned int *reclaimed);
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void *zpool_map_handle(struct zpool *pool, unsigned long handle,
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enum zpool_mapmode mm);
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void zpool_unmap_handle(struct zpool *pool, unsigned long handle);
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u64 zpool_get_total_size(struct zpool *pool);
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/**
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* struct zpool_driver - driver implementation for zpool
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* @type: name of the driver.
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* @list: entry in the list of zpool drivers.
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* @create: create a new pool.
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* @destroy: destroy a pool.
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* @malloc: allocate mem from a pool.
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* @free: free mem from a pool.
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* @shrink: shrink the pool.
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* @map: map a handle.
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* @unmap: unmap a handle.
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* @total_size: get total size of a pool.
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*
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* This is created by a zpool implementation and registered
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* with zpool.
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*/
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struct zpool_driver {
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char *type;
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struct module *owner;
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atomic_t refcount;
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struct list_head list;
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void *(*create)(char *name, gfp_t gfp, struct zpool_ops *ops);
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void (*destroy)(void *pool);
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int (*malloc)(void *pool, size_t size, gfp_t gfp,
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unsigned long *handle);
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void (*free)(void *pool, unsigned long handle);
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int (*shrink)(void *pool, unsigned int pages,
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unsigned int *reclaimed);
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void *(*map)(void *pool, unsigned long handle,
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enum zpool_mapmode mm);
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void (*unmap)(void *pool, unsigned long handle);
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u64 (*total_size)(void *pool);
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};
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void zpool_register_driver(struct zpool_driver *driver);
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int zpool_unregister_driver(struct zpool_driver *driver);
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int zpool_evict(void *pool, unsigned long handle);
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#endif
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