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linux-next/tools/testing/selftests/zram
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bamvor.zhangjian@huawei.com 80d443e887 selftests: add EXTRA_CLEAN for clean target 
Some testcases need the clean extra data after running. This patch
introduce the "EXTRA_CLEAN" variable to address this requirement.

After KBUILD_OUTPUT is enabled in later patch, it will be easy to
decide to if we need do the cleanup in the KBUILD_OUTPUT path(if the
testcase ran immediately after compiled).

Signed-off-by: Bamvor Jian Zhang <bamvor.zhangjian@linaro.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2017-01-05 13:42:17 -07:00
..
config selftests: create test-specific kconfig fragments 2016-02-25 09:47:52 -07:00
Makefile selftests: add EXTRA_CLEAN for clean target 2017-01-05 13:42:17 -07:00
README selftests/zram: replace ZRAM_LZ4_COMPRESS 2016-09-20 09:00:01 -06:00
zram01.sh selftests/zram: must be run as root 2015-09-01 10:51:32 -06:00
zram02.sh selftests/zram: must be run as root 2015-09-01 10:51:32 -06:00
zram_lib.sh seltests/zram: fix syntax error 2015-09-14 16:40:57 -06:00
zram.sh seltests/zram: fix syntax error 2015-09-14 16:40:57 -06:00

README 

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