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2 zram: Compressed RAM-based block devices
8 The zram module creates RAM-based block devices named /dev/zram<id>
20 There are several ways to configure and manage zram device(-s):
23 b) using zramctl utility, provided by util-linux (util-linux@vger.kernel.org).
28 In order to get a better idea about zramctl please consult util-linux
29 documentation, zramctl man-page or `zramctl --help`. Please be informed
30 that zram maintainers do not develop/maintain util-linux or zramctl, should
31 you have any questions please contact util-linux@vger.kernel.org
45 -EBUSY an attempt to modify an attribute that cannot be changed once
47 -ENOMEM zram was not able to allocate enough memory to fulfil your
49 -EINVAL invalid input has been provided.
56 if [ $? -ne 0 ]; then
58 fi
72 pre-created. Default: 1.
78 allocate multiple compression streams - one per online CPU - thus
81 become offline. There is no single-compression-stream mode anymore,
168 zram provides a control interface, which enables dynamic (on-demand) device
177 cat /sys/class/zram-control/hot_add
183 echo X > /sys/class/zram-control/hot_remove
188 Per-device statistics are exported as various nodes under /sys/block/zram<id>/
191 please read Documentation/ABI/testing/sysfs-block-zram.
232 invalid_io The number of non-page-size-aligned I/O requests
310 ---------
373 If admin wants to limit writeback as per-day 400M, they could do it
416 302 63.806919 ..hi