| 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>/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>/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 |
| 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. |
| |
| What: /sys/block/zram<id>/backing_dev |
| Date: June 2017 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| The backing_dev file is read-write and set up backing |
| device for zram to write incompressible pages. |
| For using, user should enable CONFIG_ZRAM_WRITEBACK. |
| |
| What: /sys/block/zram<id>/idle |
| Date: November 2018 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| idle file is write-only and mark zram slot as idle. |
| If system has mounted debugfs, user can see which slots |
| are idle via /sys/kernel/debug/zram/zram<id>/block_state |
| |
| What: /sys/block/zram<id>/writeback |
| Date: November 2018 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| The writeback file is write-only and trigger idle and/or |
| huge page writeback to backing device. |
| |
| What: /sys/block/zram<id>/bd_stat |
| Date: November 2018 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| The bd_stat file is read-only and represents backing device's |
| statistics (bd_count, bd_reads, bd_writes) in a format |
| similar to block layer statistics file format. |
| |
| What: /sys/block/zram<id>/writeback_limit_enable |
| Date: November 2018 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| The writeback_limit_enable file is read-write and specifies |
| eanbe of writeback_limit feature. "1" means eable the feature. |
| No limit "0" is the initial state. |
| |
| What: /sys/block/zram<id>/writeback_limit |
| Date: November 2018 |
| Contact: Minchan Kim <minchan@kernel.org> |
| Description: |
| The writeback_limit file is read-write and specifies the maximum |
| amount of writeback ZRAM can do. The limit could be changed |
| in run time. |
| |
| What: /sys/block/zram<id>/recomp_algorithm |
| Date: November 2022 |
| Contact: Sergey Senozhatsky <senozhatsky@chromium.org> |
| Description: |
| The recomp_algorithm file is read-write and allows to set |
| or show secondary compression algorithms. |
| |
| What: /sys/block/zram<id>/recompress |
| Date: November 2022 |
| Contact: Sergey Senozhatsky <senozhatsky@chromium.org> |
| Description: |
| The recompress file is write-only and triggers re-compression |
| with secondary compression algorithms. |
