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| -rw-r--r-- | drivers/staging/zram/zram.txt | 51 |
1 files changed, 31 insertions, 20 deletions
diff --git a/drivers/staging/zram/zram.txt b/drivers/staging/zram/zram.txt index 9694acfeb43f..520edc1bea73 100644 --- a/drivers/staging/zram/zram.txt +++ b/drivers/staging/zram/zram.txt @@ -1,46 +1,57 @@ -ramzswap: Compressed RAM based swap device -------------------------------------------- +zram: Compressed RAM based block devices +---------------------------------------- Project home: http://compcache.googlecode.com/ * Introduction -The ramzswap module creates RAM based block devices which can (only) be used as -swap disks. Pages swapped to these devices are compressed and stored in memory -itself. See project home for use cases, performance numbers and a lot more. +The zram module creates RAM based block devices: /dev/ramX (X = 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. -Individual ramzswap devices are configured and initialized using rzscontrol -userspace utility as shown in examples below. See rzscontrol man page for more -details. +See project home for use cases, performance numbers and a lot more. + +Individual zram devices are configured and initialized using zramconfig +userspace utility as shown in examples below. See zramconfig man page for +more details. * Usage -Following shows a typical sequence of steps for using ramzswap. +Following shows a typical sequence of steps for using zram. 1) Load Modules: - modprobe ramzswap num_devices=4 - This creates 4 (uninitialized) devices: /dev/ramzswap{0,1,2,3} + modprobe zram num_devices=4 + This creates 4 (uninitialized) devices: /dev/zram{0,1,2,3} (num_devices parameter is optional. Default: 1) 2) Initialize: - Use rzscontrol utility to configure and initialize individual - ramzswap devices. Example: - rzscontrol /dev/ramzswap2 --init # uses default value of disksize_kb + Use zramconfig utility to configure and initialize individual + zram devices. For example: + zramconfig /dev/zram0 --init # uses default value of disksize_kb + zramconfig /dev/zram1 --disksize_kb=102400 # 100MB /dev/zram1 - *See rzscontrol man page for more details and examples* + *See zramconfig man page for more details and examples* 3) Activate: - swapon /dev/ramzswap2 # or any other initialized ramzswap device + mkswap /dev/zram0 + swapon /dev/zram0 + + mkfs.ext4 /dev/zram1 + mount /dev/zram1 /tmp 4) Stats: - rzscontrol /dev/ramzswap2 --stats + zramconfig /dev/zram0 --stats + zramconfig /dev/zram1 --stats 5) Deactivate: - swapoff /dev/ramzswap2 + swapoff /dev/zram0 + umount /dev/zram1 6) Reset: - rzscontrol /dev/ramzswap2 --reset - (This frees all the memory allocated for this device). + zramconfig /dev/zram0 --reset + zramconfig /dev/zram1 --reset + (This frees memory allocated for the given device). Please report any problems at: |