diff options
Diffstat (limited to 'drivers/block/zram/zram_drv.h')
| -rw-r--r-- | drivers/block/zram/zram_drv.h | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h index 3b94d12f41b4..6cee93f9c0d0 100644 --- a/drivers/block/zram/zram_drv.h +++ b/drivers/block/zram/zram_drv.h @@ -17,7 +17,6 @@ #include <linux/rwsem.h> #include <linux/zsmalloc.h> -#include <linux/crypto.h> #include "zcomp.h" @@ -28,7 +27,6 @@ #define ZRAM_SECTOR_PER_LOGICAL_BLOCK \ (1 << (ZRAM_LOGICAL_BLOCK_SHIFT - SECTOR_SHIFT)) - /* * ZRAM is mainly used for memory efficiency so we want to keep memory * footprint small and thus squeeze size and zram pageflags into a flags @@ -45,11 +43,10 @@ /* Flags for zram pages (table[page_no].flags) */ enum zram_pageflags { - /* zram slot is locked */ - ZRAM_LOCK = ZRAM_FLAG_SHIFT, - ZRAM_SAME, /* Page consists the same element */ + ZRAM_SAME = ZRAM_FLAG_SHIFT, /* Page consists the same element */ + ZRAM_ENTRY_LOCK, /* entry access lock bit */ ZRAM_WB, /* page is stored on backing_device */ - ZRAM_UNDER_WB, /* page is under writeback */ + ZRAM_PP_SLOT, /* Selected for post-processing */ ZRAM_HUGE, /* Incompressible page */ ZRAM_IDLE, /* not accessed page since last idle marking */ ZRAM_INCOMPRESSIBLE, /* none of the algorithms could compress it */ @@ -60,18 +57,19 @@ enum zram_pageflags { __NR_ZRAM_PAGEFLAGS, }; -/*-- Data structures */ - -/* Allocated for each disk page */ +/* + * Allocated for each disk page. We use bit-lock (ZRAM_ENTRY_LOCK bit + * of flags) to save memory. There can be plenty of entries and standard + * locking primitives (e.g. mutex) will significantly increase sizeof() + * of each entry and hence of the meta table. + */ struct zram_table_entry { - union { - unsigned long handle; - unsigned long element; - }; + unsigned long handle; unsigned long flags; #ifdef CONFIG_ZRAM_TRACK_ENTRY_ACTIME ktime_t ac_time; #endif + struct lockdep_map dep_map; }; struct zram_stats { @@ -84,7 +82,6 @@ struct zram_stats { atomic64_t huge_pages_since; /* no. of huge pages since zram set up */ atomic64_t pages_stored; /* no. of pages currently stored */ atomic_long_t max_used_pages; /* no. of maximum pages stored */ - atomic64_t writestall; /* no. of write slow paths */ atomic64_t miss_free; /* no. of missed free */ #ifdef CONFIG_ZRAM_WRITEBACK atomic64_t bd_count; /* no. of pages in backing device */ @@ -107,6 +104,7 @@ struct zram { struct zram_table_entry *table; struct zs_pool *mem_pool; struct zcomp *comps[ZRAM_MAX_COMPS]; + struct zcomp_params params[ZRAM_MAX_COMPS]; struct gendisk *disk; /* Prevent concurrent execution of device init */ struct rw_semaphore init_lock; @@ -132,12 +130,13 @@ struct zram { spinlock_t wb_limit_lock; bool wb_limit_enable; u64 bd_wb_limit; - struct bdev_handle *bdev_handle; + struct block_device *bdev; unsigned long *bitmap; unsigned long nr_pages; #endif #ifdef CONFIG_ZRAM_MEMORY_TRACKING struct dentry *debugfs_dir; #endif + atomic_t pp_in_progress; }; #endif |