| ramzswap: Compressed RAM based swap device |
| ------------------------------------------- |
| |
| Project home: http://compcache.googlecode.com/ |
| |
| * Introduction |
| |
| It creates RAM based block devices which can be used (only) 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. |
| |
| Individual ramzswap devices are configured and initialized using rzscontrol |
| userspace utility as shown in examples below. See rzscontrol man page for more |
| details. |
| |
| * Usage |
| |
| Following shows a typical sequence of steps for using ramzswap. |
| |
| 1) Load Modules: |
| modprobe ramzswap num_devices=4 |
| This creates 4 (uninitialized) devices: /dev/ramzswap{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 |
| |
| *See rzscontrol man page for more details and examples* |
| |
| 3) Activate: |
| swapon /dev/ramzswap2 # or any other initialized ramzswap device |
| |
| 4) Stats: |
| rzscontrol /dev/ramzswap2 --stats |
| |
| 5) Deactivate: |
| swapoff /dev/ramzswap2 |
| |
| 6) Reset: |
| rzscontrol /dev/ramzswap2 --reset |
| (This frees all the memory allocated for this device). |
| |
| |
| Please report any problems at: |
| - Mailing list: linux-mm-cc at laptop dot org |
| - Issue tracker: http://code.google.com/p/compcache/issues/list |
| |
| Nitin Gupta |
| ngupta@vflare.org |
