diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 17:39:10 -0700 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 17:39:10 -0700 |
commit | 54283aed90c3cf353e2c01a1d1ca853f5eedf92a (patch) | |
tree | 5886bf38f7a234f34044a95a43886cfd54376ed2 /tools/testing/selftests/zram/README | |
parent | 9a9952bbd76a13fc2c95c28f09ba1801a3664929 (diff) | |
parent | 7eba7d90d48217a97afc171a311b386bde965f39 (diff) | |
download | blackbird-op-linux-54283aed90c3cf353e2c01a1d1ca853f5eedf92a.tar.gz blackbird-op-linux-54283aed90c3cf353e2c01a1d1ca853f5eedf92a.zip |
Merge tag 'linux-kselftest-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest
Pull kselftest update from Shuah Khan:
"This update adds new zram test and fixes to problems found during
testing this new zram test. In addition, there are a few bug fixes
and ksefltest improvement patches from Linaro developers.
I will send another update later on this week to fix kselftest
breakage due to commit 2bf9e0ab08c6 ("locking/static_keys: Provide a
selftest") after the fix soaks in next for a couple of days"
* tag 'linux-kselftest-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
selftests/zram: Makefile fix
selftests/zram: must be run as root
selftests: breakpoints: fix installing error on the architecture except x86
selftests: check before install
selftests/zram: Adding zram tests
Diffstat (limited to 'tools/testing/selftests/zram/README')
-rw-r--r-- | tools/testing/selftests/zram/README | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/testing/selftests/zram/README b/tools/testing/selftests/zram/README new file mode 100644 index 000000000000..eb17917c8a3a --- /dev/null +++ b/tools/testing/selftests/zram/README @@ -0,0 +1,40 @@ +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_ZRAM_LZ4_COMPRESS=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 |