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Diffstat (limited to 'drivers/staging/zram/zram.txt')
| -rw-r--r-- | drivers/staging/zram/zram.txt | 76 |
1 files changed, 0 insertions, 76 deletions
diff --git a/drivers/staging/zram/zram.txt b/drivers/staging/zram/zram.txt deleted file mode 100644 index 5f75d29..0000000 --- a/drivers/staging/zram/zram.txt +++ /dev/null @@ -1,76 +0,0 @@ -zram: Compressed RAM based block devices ----------------------------------------- - -Project home: http://compcache.googlecode.com/ - -* 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>/ - -* Usage - -Following shows a typical sequence of steps for using zram. - -1) Load Module: - modprobe zram num_devices=4 - This creates 4 devices: /dev/zram{0,1,2,3} - (num_devices parameter is optional. Default: 1) - -2) Set Disksize (Optional): - Set disk size by writing the value to sysfs node 'disksize' - (in bytes). If disksize is not given, default value of 25% - of RAM is used. - - # Initialize /dev/zram0 with 50MB disksize - echo $((50*1024*1024)) > /sys/block/zram0/disksize - - NOTE: disksize cannot be changed if the disk contains any - data. So, for such a disk, you need to issue 'reset' (see below) - before you can change its disksize. - -3) Activate: - mkswap /dev/zram0 - swapon /dev/zram0 - - mkfs.ext4 /dev/zram1 - mount /dev/zram1 /tmp - -4) Stats: - Per-device statistics are exported as various nodes under - /sys/block/zram<id>/ - disksize - num_reads - num_writes - invalid_io - notify_free - discard - zero_pages - orig_data_size - compr_data_size - mem_used_total - -5) Deactivate: - swapoff /dev/zram0 - umount /dev/zram1 - -6) Reset: - Write any positive value to 'reset' sysfs node - echo 1 > /sys/block/zram0/reset - echo 1 > /sys/block/zram1/reset - - (This frees all the memory allocated for the given 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 |