# SPDX-License-Identifier: GPL-2.0
|
config ZRAM
|
tristate "Compressed RAM block device support"
|
depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
|
select CRYPTO_LZO
|
help
|
Creates virtual block devices called /dev/zramX (X = 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.
|
|
It has several use cases, for example: /tmp storage, use as swap
|
disks and maybe many more.
|
|
See Documentation/admin-guide/blockdev/zram.rst for more information.
|
|
config ZRAM_WRITEBACK
|
bool "Write back incompressible or idle page to backing device"
|
depends on ZRAM
|
help
|
With incompressible page, there is no memory saving to keep it
|
in memory. Instead, write it out to backing device.
|
For this feature, admin should set up backing device via
|
/sys/block/zramX/backing_dev.
|
|
With /sys/block/zramX/{idle,writeback}, application could ask
|
idle page's writeback to the backing device to save in memory.
|
|
See Documentation/admin-guide/blockdev/zram.rst for more information.
|
|
config ZRAM_MEMORY_TRACKING
|
bool "Track zRam block status"
|
depends on ZRAM && DEBUG_FS
|
help
|
With this feature, admin can track the state of allocated blocks
|
of zRAM. Admin could see the information via
|
/sys/kernel/debug/zram/zramX/block_state.
|
|
See Documentation/admin-guide/blockdev/zram.rst for more information.
|
