On Wed, Feb 12, 2014 at 10:39:36PM +0300, Sergey Senozhatsky wrote:
> Add max_comp_streams device attribute documentation.
>
> Signed-off-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
> ---
> Documentation/ABI/testing/sysfs-block-zram | 9 ++++++++-
> Documentation/blockdev/zram.txt | 20 +++++++++++++++-----
> 2 files changed, 23 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-block-zram
> b/Documentation/ABI/testing/sysfs-block-zram
> index 8aa0468..0da9ed6 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.senozhat...@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.senozhat...@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 <ngu...@vflare.org>
> diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
> index b31ac5e..c6a55fb 100644
> --- a/Documentation/blockdev/zram.txt
> +++ b/Documentation/blockdev/zram.txt
> @@ -21,7 +21,17 @@ 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.
> + Examples:
> + #set max buffers to 3
Pz, don't use buffers.
> + echo 3 > /sys/block/zram0/max_comp_streams
> +
> + #show max buffers
Ditto.
> + cat /sys/block/zram0/max_comp_streams
> +
> +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 +48,14 @@ 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 +70,11 @@ 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
> --
> 1.9.0.rc3.256.g4af3ebd
>
> --
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--
Kind regards,
Minchan Kim
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