* Stored at beginning of each compressed object.
*
* It stores back-reference to table entry which points to this
- * object. This is required to support memory defragmentation or
- * migrating compressed pages to backing swap disk.
+ * object. This is required to support memory defragmentation.
*/
struct zobj_header {
#if 0
/* Default ramzswap disk size: 25% of total RAM */
static const unsigned default_disksize_perc_ram = 25;
-static const unsigned default_memlimit_perc_ram = 15;
/*
- * Max compressed page size when backing device is provided.
- * Pages that compress to size greater than this are sent to
- * physical swap disk.
- */
-static const unsigned max_zpage_size_bdev = PAGE_SIZE / 2;
-
-/*
- * Max compressed page size when there is no backing dev.
* Pages that compress to size greater than this are stored
* uncompressed in memory.
*/
-static const unsigned max_zpage_size_nobdev = PAGE_SIZE / 4 * 3;
+static const unsigned max_zpage_size = PAGE_SIZE / 4 * 3;
/*
- * NOTE: max_zpage_size_{bdev,nobdev} sizes must be
- * less than or equal to:
+ * NOTE: max_zpage_size must be less than or equal to:
* XV_MAX_ALLOC_SIZE - sizeof(struct zobj_header)
- * since otherwise xv_malloc would always return failure.
+ * otherwise, xv_malloc() would always return failure.
*/
/*-- End of configurable params */
u8 flags;
} __attribute__((aligned(4)));
-/*
- * Swap extent information in case backing swap is a regular
- * file. These extent entries must fit exactly in a page.
- */
-struct ramzswap_backing_extent {
- pgoff_t phy_pagenum;
- pgoff_t num_pages;
-} __attribute__((aligned(4)));
-
struct ramzswap_stats {
/* basic stats */
size_t compr_size; /* compressed size of pages stored -
u32 pages_stored; /* no. of pages currently stored */
u32 good_compress; /* % of pages with compression ratio<=50% */
u32 pages_expand; /* % of incompressible pages */
- u64 bdev_num_reads; /* no. of reads on backing dev */
- u64 bdev_num_writes; /* no. of writes on backing dev */
#endif
};
struct request_queue *queue;
struct gendisk *disk;
int init_done;
- /*
- * This is limit on compressed data size (stats.compr_size)
- * Its applicable only when backing swap device is present.
- */
- size_t memlimit; /* bytes */
/*
* This is limit on amount of *uncompressed* worth of data
* we can hold. When backing swap device is provided, it is
size_t disksize; /* bytes */
struct ramzswap_stats stats;
-
- /* backing swap device info */
- struct ramzswap_backing_extent *curr_extent;
- struct list_head backing_swap_extent_list;
- unsigned long num_extents;
- char backing_swap_name[MAX_SWAP_NAME_LEN];
- struct block_device *backing_swap;
- struct file *swap_file;
};
/*-- */
spin_unlock(&rzs->stat64_lock);
}
-static void rzs_stat64_dec(struct ramzswap *rzs, u64 *v)
-{
- spin_lock(&rzs->stat64_lock);
- *v = *v - 1;
- spin_unlock(&rzs->stat64_lock);
-}
-
static u64 rzs_stat64_read(struct ramzswap *rzs, u64 *v)
{
u64 val;
#define rzs_stat_inc(v)
#define rzs_stat_dec(v)
#define rzs_stat64_inc(r, v)
-#define rzs_stat64_dec(r, v)
#define rzs_stat64_read(r, v)
#endif /* CONFIG_RAMZSWAP_STATS */