Write back incompressible or idle page to backing device
configname: CONFIG_ZRAM_WRITEBACK
Linux Kernel Configuration
└─>Device Drivers
└─>Block devices
└─>Write back incompressible or idle page to backing device
In linux kernel since version 3.10 (release Date: 2013-06-30)
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.
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.