1/* 2 * Compressed RAM block device 3 * 4 * Copyright (C) 2008, 2009, 2010 Nitin Gupta 5 * 6 * This code is released using a dual license strategy: BSD/GPL 7 * You can choose the licence that better fits your requirements. 8 * 9 * Released under the terms of 3-clause BSD License 10 * Released under the terms of GNU General Public License Version 2.0 11 * 12 * Project home: http://compcache.googlecode.com 13 */ 14 15#ifndef _ZRAM_IOCTL_H_ 16#define _ZRAM_IOCTL_H_ 17 18struct zram_ioctl_stats { 19 u64 disksize; /* disksize in bytes (user specifies in KB) */ 20 u64 num_reads; /* failed + successful */ 21 u64 num_writes; /* --do-- */ 22 u64 failed_reads; /* should NEVER! happen */ 23 u64 failed_writes; /* can happen when memory is too low */ 24 u64 invalid_io; /* non-page-aligned I/O requests */ 25 u64 notify_free; /* no. of swap slot free notifications */ 26 u32 pages_zero; /* no. of zero filled pages */ 27 u32 good_compress_pct; /* no. of pages with compression ratio<=50% */ 28 u32 pages_expand_pct; /* no. of incompressible pages */ 29 u32 pages_stored; 30 u32 pages_used; 31 u64 orig_data_size; 32 u64 compr_data_size; 33 u64 mem_used_total; 34} __attribute__ ((packed, aligned(4))); 35 36#define ZRAMIO_SET_DISKSIZE_KB _IOW('z', 0, size_t) 37#define ZRAMIO_GET_STATS _IOR('z', 1, struct zram_ioctl_stats) 38#define ZRAMIO_INIT _IO('z', 2) 39#define ZRAMIO_RESET _IO('z', 3) 40 41#endif 42