178 lines
6.2 KiB
Text
178 lines
6.2 KiB
Text
|
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>/num_reads
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The num_reads file is read-only and specifies the number of
|
||
|
|
reads (failed or successful) done on this device.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/num_writes
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The num_writes file is read-only and specifies the number of
|
||
|
|
writes (failed or successful) done on this device.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/invalid_io
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The invalid_io file is read-only and specifies the number of
|
||
|
|
non-page-size-aligned I/O requests issued to this device.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/failed_reads
|
||
|
|
Date: February 2014
|
||
|
|
Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
|
||
|
|
Description:
|
||
|
|
The failed_reads file is read-only and specifies the number of
|
||
|
|
failed reads happened on this device.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/failed_writes
|
||
|
|
Date: February 2014
|
||
|
|
Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
|
||
|
|
Description:
|
||
|
|
The failed_writes file is read-only and specifies the number of
|
||
|
|
failed writes happened on this device.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/max_comp_streams
|
||
|
|
Date: February 2014
|
||
|
|
Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
|
||
|
|
Description:
|
||
|
|
The max_comp_streams file is read-write and specifies the
|
||
|
|
number of backend's zcomp_strm compression streams (number of
|
||
|
|
concurrent compress operations).
|
||
|
|
|
||
|
|
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>/notify_free
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The notify_free file is read-only. Depending on device usage
|
||
|
|
scenario it may account a) the number of pages freed because
|
||
|
|
of swap slot free notifications or b) the number of pages freed
|
||
|
|
because of REQ_DISCARD requests sent by bio. The former ones
|
||
|
|
are sent to a swap block device when a swap slot is freed, which
|
||
|
|
implies that this disk is being used as a swap disk. The latter
|
||
|
|
ones are sent by filesystem mounted with discard option,
|
||
|
|
whenever some data blocks are getting discarded.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/zero_pages
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The zero_pages file is read-only and specifies number of zero
|
||
|
|
filled pages written to this disk. No memory is allocated for
|
||
|
|
such pages.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/orig_data_size
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The orig_data_size file is read-only and specifies uncompressed
|
||
|
|
size of data stored in this disk. This excludes zero-filled
|
||
|
|
pages (zero_pages) since no memory is allocated for them.
|
||
|
|
Unit: bytes
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/compr_data_size
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The compr_data_size file is read-only and specifies compressed
|
||
|
|
size of data stored in this disk. So, compression ratio can be
|
||
|
|
calculated using orig_data_size and this statistic.
|
||
|
|
Unit: bytes
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/mem_used_total
|
||
|
|
Date: August 2010
|
||
|
|
Contact: Nitin Gupta <ngupta@vflare.org>
|
||
|
|
Description:
|
||
|
|
The mem_used_total file is read-only and specifies the amount
|
||
|
|
of memory, including allocator fragmentation and metadata
|
||
|
|
overhead, allocated for this disk. So, allocator space
|
||
|
|
efficiency can be calculated using compr_data_size and this
|
||
|
|
statistic.
|
||
|
|
Unit: bytes
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/mem_used_max
|
||
|
|
Date: August 2014
|
||
|
|
Contact: Minchan Kim <minchan@kernel.org>
|
||
|
|
Description:
|
||
|
|
The mem_used_max file is read/write and specifies the amount
|
||
|
|
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 read/write 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
|
||
|
|
Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
|
||
|
|
Description:
|
||
|
|
The mm_stat file is read-only and represents device's mm
|
||
|
|
statistics (orig_data_size, compr_data_size, etc.) in a format
|
||
|
|
similar to block layer statistics file format.
|
||
|
|
|
||
|
|
What: /sys/block/zram<id>/debug_stat
|
||
|
|
Date: July 2016
|
||
|
|
Contact: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
|
||
|
|
Description:
|
||
|
|
The debug_stat file is read-only and represents various
|
||
|
|
device's debugging info useful for kernel developers. Its
|
||
|
|
format is not documented intentionally and may change
|
||
|
|
anytime without any notice.
|