LXR linux/drivers/block/zram/Kconfig

   1# SPDX-License-Identifier: GPL-2.0
   2config ZRAM
   3        tristate "Compressed RAM block device support"
   4        depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
   5        select CRYPTO_LZO
   6        default n
   7        help
   8          Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
   9          Pages written to these disks are compressed and stored in memory
  10          itself. These disks allow very fast I/O and compression provides
  11          good amounts of memory savings.
  12
  13          It has several use cases, for example: /tmp storage, use as swap
  14          disks and maybe many more.
  15
  16          See Documentation/blockdev/zram.txt for more information.
  17
  18config ZRAM_WRITEBACK
  19       bool "Write back incompressible page to backing device"
  20       depends on ZRAM
  21       default n
  22       help
  23         With incompressible page, there is no memory saving to keep it
  24         in memory. Instead, write it out to backing device.
  25         For this feature, admin should set up backing device via
  26         /sys/block/zramX/backing_dev.
  27
  28         See Documentation/blockdev/zram.txt for more information.
  29
  30config ZRAM_MEMORY_TRACKING
  31        bool "Track zRam block status"
  32        depends on ZRAM && DEBUG_FS
  33        help
  34          With this feature, admin can track the state of allocated blocks
  35          of zRAM. Admin could see the information via
  36          /sys/kernel/debug/zram/zramX/block_state.
  37
  38          See Documentation/blockdev/zram.txt for more information.
  39