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Message-Id: <1392313402-5728-5-git-send-email-sergey.senozhatsky@gmail.com>
Date: Thu, 13 Feb 2014 20:43:22 +0300
From: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To: Minchan Kim <minchan@...nel.org>
Cc: Jerome Marchand <jmarchan@...hat.com>,
Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org,
Sergey Senozhatsky <sergey.senozhatsky@...il.com>
Subject: [PATCHv5 4/4] zram: document max_comp_streams
Add max_comp_streams device attribute documentation.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.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.senozhatsky@...il.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@...il.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@...are.org>
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt
index b31ac5e..b5a722c 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 compression streams number to 3
+ echo 3 > /sys/block/zram0/max_comp_streams
+
+ #show max compression streams number
+ 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.rc3.260.g4cf525c
--
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