MIRRORS/linux-imx
1
0
Fork 0
mirror of https://github.com/nxp-imx/linux-imx.git synced 2025-07-19 07:39:54 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity
5c3485bb12
linux-imx/tools/testing/selftests/zram
History
Mauro Carvalho Chehab e7751617dd docs: blockdev: add it to the admin-guide 
The blockdev book basically contains user-faced documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2019-07-15 11:03:01 -03:00
..
config
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
README docs: blockdev: add it to the admin-guide 2019-07-15 11:03:01 -03:00
zram_lib.sh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 25 2019-05-21 11:52:39 +02:00
zram.sh selftests: zram: return Kselftest Skip code for skipped tests 2018-06-18 09:11:09 -06:00
zram01.sh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 25 2019-05-21 11:52:39 +02:00
zram02.sh treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 25 2019-05-21 11:52:39 +02:00

README

zram: Compressed RAM based block devices

  • Introduction

The zram module creates RAM based block devices named /dev/zram ( = 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/

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/admin-guide/blockdev/zram.rst