docs: blockdev: add it to the admin-guide

2019-07-15T14:03:01Z

The blockdev book basically contains user-faced documentation. Signed-off-by: Mauro Carvalho Chehab

docs: blockdev: convert to ReST

2019-07-15T12:20:26Z

Rename the blockdev documentation files to ReST, add an index for them and adjust in order to produce a nice html output via the Sphinx build system. The drbd sub-directory contains some graphs and data flows. Add those too to the documentation. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab

selftests/zram: replace ZRAM_LZ4_COMPRESS

2016-09-20T15:00:01Z

Since commit ce1ed9f98e88 ("zram: delete custom lzo/lz4") we need CONFIG_CRYPTO_LZ4=y instead of CONFIG_ZRAM_LZ4_COMPRESS Signed-off-by: Fabian Frederick Signed-off-by: Shuah Khan

selftests/zram: Adding zram tests

2015-08-27T22:02:01Z

zram: Compressed RAM based block devices ---------------------------------------- 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/ This patch is to validate the zram functionality. Test interacts with block device /dev/zram and sysfs nodes /sys/block/zram/ zram.sh: sanity check of CONFIG_ZRAM and to run zram01 and zram02 tests zram01.sh: creates general purpose ram disks with different filesystems zram02.sh: creates block device for swap zram_lib.sh: create library with initialization/cleanup functions README: ZRAM introduction and Kconfig required. Makefile: To run zram tests zram test output ----------------- ./zram.sh -------------------- running zram tests -------------------- /dev/zram0 device file found: OK set max_comp_streams to zram device(s) /sys/block/zram0/max_comp_streams = '2' (1/1) zram max streams: OK test that we can set compression algorithm supported algs: [lzo] lz4 /sys/block/zram0/comp_algorithm = 'lzo' (1/1) zram set compression algorithm: OK set disk size to zram device(s) /sys/block/zram0/disksize = '2097152' (1/1) zram set disksizes: OK set memory limit to zram device(s) /sys/block/zram0/mem_limit = '2M' (1/1) zram set memory limit: OK make ext4 filesystem on /dev/zram0 zram mkfs.ext4: OK mount /dev/zram0 zram mount of zram device(s): OK fill zram0... zram0 can be filled with '1932' KB zram used 3M, zram disk sizes 2097152M zram compression ratio: 699050.66:1: OK zram cleanup zram01 : [PASS] /dev/zram0 device file found: OK set max_comp_streams to zram device(s) /sys/block/zram0/max_comp_streams = '2' (1/1) zram max streams: OK set disk size to zram device(s) /sys/block/zram0/disksize = '1048576' (1/1) zram set disksizes: OK set memory limit to zram device(s) /sys/block/zram0/mem_limit = '1M' (1/1) zram set memory limit: OK make swap with zram device(s) done with /dev/zram0 zram making zram mkswap and swapon: OK zram swapoff: OK zram cleanup zram02 : [PASS] CC: Shuah Khan CC: Tyler Baker CC: Milosz Wasilewski CC: Alexey Kodanev Signed-off-by: Naresh Kamboju Signed-off-by: Alexey Kodanev Reviewed-By: Tyler Baker Signed-off-by: Shuah Khan

linux-dev/tools/testing/selftests/zram/README, branch master

docs: blockdev: add it to the admin-guide

docs: blockdev: convert to ReST

selftests/zram: replace ZRAM_LZ4_COMPRESS

selftests/zram: Adding zram tests