diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-zram | 9 | ||||
| -rw-r--r-- | Documentation/blockdev/zram.txt | 31 |
2 files changed, 34 insertions, 6 deletions
diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram index 8aa046841625..0da9ed6b82ea 100644 --- a/Documentation/ABI/testing/sysfs-block-zram +++ b/Documentation/ABI/testing/sysfs-block-zram @@ -50,7 +50,6 @@ Description: The failed_reads file is read-only and specifies the number of failed reads happened on this device. - What: /sys/block/zram<id>/failed_writes Date: February 2014 Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> @@ -58,6 +57,14 @@ Description: The failed_writes file is read-only and specifies the number of failed writes happened on this device. +What: /sys/block/zram<id>/max_comp_streams +Date: February 2014 +Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> +Description: + The max_comp_streams file is read-write and specifies the + number of backend's zcomp_strm compression streams (number of + concurrent compress operations). + What: /sys/block/zram<id>/notify_free Date: August 2010 Contact: Nitin Gupta <ngupta@vflare.org> diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index b31ac5e5d4b9..aadfe60391b7 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -21,7 +21,28 @@ Following shows a typical sequence of steps for using zram. This creates 4 devices: /dev/zram{0,1,2,3} (num_devices parameter is optional. Default: 1) -2) Set Disksize +2) Set max number of compression streams + Compression backend may use up to max_comp_streams compression streams, + thus allowing up to max_comp_streams concurrent compression operations. + By default, compression backend uses single compression stream. + + Examples: + #show max compression streams number + cat /sys/block/zram0/max_comp_streams + + #set max compression streams number to 3 + echo 3 > /sys/block/zram0/max_comp_streams + +Note: +In order to enable compression backend's multi stream support max_comp_streams +must be initially set to desired concurrency level before ZRAM device +initialisation. Once the device initialised as a single stream compression +backend (max_comp_streams equals to 0) changing the value of max_comp_streams +will not take any effect, because single stream compression backend implemented +as a special case and does not support dynamic max_comp_streams. Only multi +stream backend supports dynamic max_comp_streams adjustment. + +3) Set Disksize Set disk size by writing the value to sysfs node 'disksize'. The value can be either in bytes or you can use mem suffixes. Examples: @@ -38,14 +59,14 @@ There is little point creating a zram of greater than twice the size of memory since we expect a 2:1 compression ratio. Note that zram uses about 0.1% of the size of the disk when not in use so a huge zram is wasteful. -3) Activate: +4) Activate: mkswap /dev/zram0 swapon /dev/zram0 mkfs.ext4 /dev/zram1 mount /dev/zram1 /tmp -4) Stats: +5) Stats: Per-device statistics are exported as various nodes under /sys/block/zram<id>/ disksize @@ -60,11 +81,11 @@ size of the disk when not in use so a huge zram is wasteful. compr_data_size mem_used_total -5) Deactivate: +6) Deactivate: swapoff /dev/zram0 umount /dev/zram1 -6) Reset: +7) Reset: Write any positive value to 'reset' sysfs node echo 1 > /sys/block/zram0/reset echo 1 > /sys/block/zram1/reset |