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- zram: Compressed RAM based block devices
- ----------------------------------------
- * Introduction
- The zram module creates RAM based block devices named /dev/zram<id>
- (<id> = 0, 1, ...). Pages written to these disks are compressed and stored
- in memory itself. These disks allow very fast I/O and compression provides
- good amounts of memory savings. Some of the usecases include /tmp storage,
- use as swap disks, various caches under /var and maybe many more :)
- Statistics for individual zram devices are exported through sysfs nodes at
- /sys/block/zram<id>/
- Kconfig required:
- CONFIG_ZRAM=y
- CONFIG_CRYPTO_LZ4=y
- CONFIG_ZPOOL=y
- CONFIG_ZSMALLOC=y
- ZRAM Testcases
- --------------
- zram_lib.sh: create library with initialization/cleanup functions
- zram.sh: For sanity check of CONFIG_ZRAM and to run zram01 and zram02
- Two functional tests: zram01 and zram02:
- zram01.sh: creates general purpose ram disks with ext4 filesystems
- zram02.sh: creates block device for swap
- Commands required for testing:
- - bc
- - dd
- - free
- - awk
- - mkswap
- - swapon
- - swapoff
- - mkfs/ mkfs.ext4
- For more information please refer:
- kernel-source-tree/Documentation/blockdev/zram.txt
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