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View Code? Open in Web Editor NEWCompcache support and module
Home Page: http://code.google.com/p/compcache
Compcache support and module
Home Page: http://code.google.com/p/compcache
ramzswap: Compressed RAM based swap device ------------------------------------------- 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. Help page: http://compcache.googlecode.com/CompilingAndUsingNew * Compiling - 'make': This will compile all modules against your kernel - 'make doc': This will compile rzscontrol manual page: sub-projects/rzscontrol/man/rzscontrol.1 - Optional (HIGHLY RECOMMENDED): - Apply the patch found in compcache/patches/ directory and just compile the kernel as usual. Currently, the patch is against 2.6.33 but it should apply to slightly older kernels too. This will enable 'swap free notify' feature which allows kernel to send callback to ramzswap as soon as a swap slot becomes free. So, we can immediately free memory allocated for this page, eliminating any stale data in (compressed) memory. - Uncomment '#define CONFIG_SWAP_FREE_NOTIFY' in compcache/compat.h before compiling compcache against this patched kernel. Otherwise, this swap notify callback will not be used. Following binaries are created: - ramzswap.ko (kernel driver) - sub-projects/rzscontrol/rzscontrol (userspace tool) * Using Following shows a typical sequence of steps for using ramzswap. 1) Load Modules: # load dependency modules modprobe lzo_compress modprobe lzo_decompress # example1: load ramzswap module insmod ramzswap.ko num_devices=4 This creates 4 devices (/dev/ramzswap{0,1,2,3}) which are left uninitialized. # example2: load ramzswap module and initialize the first device insmod ramzswap.ko num_devices=4 disksize_kb=20480 This initializes first device (/dev/ramzswap0) with disksize of 20MB. Other 3 devices (/dev/ramzswap{1,2,3}) are left uninitialized. 2) Initialize: Use rzscontrol utility to configure and initialize individual ramzswap devices. Example: rzscontrol /dev/ramzswap0 --init # uses default value of disksize_kb *See rzscontrol manpage 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 7) Unload Modules: rmmod ramzswap rmmod lzo_compress rmmod lzo_decompress * Common Problems - If you get lots of compiler errors, make sure you have the package for kernel source installed. For e.g., on Fedora its 'kernel-devel' package. Please consider using Issue Tracker: http://code.google.com/p/compcache/issues/list for reporting any bugs/feature requests. Author: Nitin Gupta (ngupta at vflare dot org) Last Updated: 24/1/2010
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