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Linux/tools/testing/selftests/zram/

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Name Size Last modified (GMT) Description
Back Parent directory 2016-02-28 13:17:30
File Makefile 116 bytes 2016-02-28 13:17:30
File README 1162 bytes 2016-02-28 13:17:30
File zram.sh 491 bytes 2016-02-28 13:17:30
File zram01.sh 2712 bytes 2016-02-28 13:17:30
File zram02.sh 1664 bytes 2016-02-28 13:17:30
File zram_lib.sh 4937 bytes 2016-02-28 13:17:30

  1 zram: Compressed RAM based block devices
  2 ----------------------------------------
  3 * Introduction
  4 
  5 The zram module creates RAM based block devices named /dev/zram<id>
  6 (<id> = 0, 1, ...). Pages written to these disks are compressed and stored
  7 in memory itself. These disks allow very fast I/O and compression provides
  8 good amounts of memory savings. Some of the usecases include /tmp storage,
  9 use as swap disks, various caches under /var and maybe many more :)
 10 
 11 Statistics for individual zram devices are exported through sysfs nodes at
 12 /sys/block/zram<id>/
 13 
 14 Kconfig required:
 15 CONFIG_ZRAM=y
 16 CONFIG_ZRAM_LZ4_COMPRESS=y
 17 CONFIG_ZPOOL=y
 18 CONFIG_ZSMALLOC=y
 19 
 20 ZRAM Testcases
 21 --------------
 22 zram_lib.sh: create library with initialization/cleanup functions
 23 zram.sh: For sanity check of CONFIG_ZRAM and to run zram01 and zram02
 24 
 25 Two functional tests: zram01 and zram02:
 26 zram01.sh: creates general purpose ram disks with ext4 filesystems
 27 zram02.sh: creates block device for swap
 28 
 29 Commands required for testing:
 30  - bc
 31  - dd
 32  - free
 33  - awk
 34  - mkswap
 35  - swapon
 36  - swapoff
 37  - mkfs/ mkfs.ext4
 38 
 39 For more information please refer:
 40 kernel-source-tree/Documentation/blockdev/zram.txt

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