Documentation/ABI/testing/sysfs-block-zram

Source file repositories/reference/linux-study-clean/Documentation/ABI/testing/sysfs-block-zram

File Facts

System
Linux kernel
Corpus path
Documentation/ABI/testing/sysfs-block-zram
Extension
[no extension]
Size
5720 bytes
Lines
167
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: Documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

What:		/sys/block/zram<id>/disksize
Date:		August 2010
Contact:	Nitin Gupta <ngupta@vflare.org>
Description:
		The disksize file is read-write and specifies the disk size
		which represents the limit on the *uncompressed* worth of data
		that can be stored in this disk.
		Unit: bytes

What:		/sys/block/zram<id>/initstate
Date:		August 2010
Contact:	Nitin Gupta <ngupta@vflare.org>
Description:
		The initstate file is read-only and shows the initialization
		state of the device.

What:		/sys/block/zram<id>/reset
Date:		August 2010
Contact:	Nitin Gupta <ngupta@vflare.org>
Description:
		The reset file is write-only and allows resetting the
		device. The reset operation frees all the memory associated
		with this device.

What:		/sys/block/zram<id>/comp_algorithm
Date:		February 2014
Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Description:
		The comp_algorithm file is read-write and lets to show
		available and selected compression algorithms, change
		compression algorithm selection.

What:		/sys/block/zram<id>/mem_used_max
Date:		August 2014
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		The mem_used_max file is write-only and is used to reset
		the counter of maximum memory zram have consumed to store
		compressed data. For resetting the value, you should write
		"0". Otherwise, you could see -EINVAL.
		Unit: bytes

What:		/sys/block/zram<id>/mem_limit
Date:		August 2014
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		The mem_limit file is write-only and specifies the maximum
		amount of memory ZRAM can use to store the compressed data.
		The limit could be changed in run time and "0" means disable
		the limit. No limit is the initial state.  Unit: bytes

What:		/sys/block/zram<id>/compact
Date:		August 2015
Contact:	Minchan Kim <minchan@kernel.org>
Description:
		The compact file is write-only and trigger compaction for
		allocator zrm uses. The allocator moves some objects so that
		it could free fragment space.

What:		/sys/block/zram<id>/io_stat
Date:		August 2015
Contact:	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Description:
		The io_stat file is read-only and accumulates device's I/O
		statistics not accounted by block layer. For example,
		failed_reads, failed_writes, etc. File format is similar to
		block layer statistics file format.

What:		/sys/block/zram<id>/mm_stat
Date:		August 2015

Annotation

Implementation Notes