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| author | Sergey Senozhatsky <sergey.senozhatsky@gmail.com> | 2015-04-16 02:16:00 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-16 02:35:21 +0300 |
| commit | 77ba015f9d5c584226a634753e9b318cb272cd41 (patch) | |
| tree | 1b63cddb98207642711ec187088ca07d485783c3 /Documentation/blockdev | |
| parent | 8811a9421b325b06a2456ae1b8fe23e838cbfe33 (diff) | |
| download | linux-77ba015f9d5c584226a634753e9b318cb272cd41.tar.xz | |
zram: describe device attrs in documentation
Briefly describe exported device stat attrs in zram documentation. We
will eventually get rid of per-stat sysfs nodes and, thus, clean up
Documentation/ABI/testing/sysfs-block-zram file, which is the only source
of information about device sysfs nodes.
Add `num_migrated' description, since there is no independent
`num_migrated' sysfs node (and no corresponding sysfs-block-zram entry),
it will be exported via zram<id>/mm_stat file.
At this point we can provide minimal description, because sysfs-block-zram
still contains detailed information.
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: Nitin Gupta <ngupta@vflare.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/blockdev')
| -rw-r--r-- | Documentation/blockdev/zram.txt | 48 |
1 files changed, 34 insertions, 14 deletions
diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 7fcf9c6592ec..971765ed5ac1 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -98,20 +98,40 @@ size of the disk when not in use so a huge zram is wasteful. mount /dev/zram1 /tmp 7) Stats: - Per-device statistics are exported as various nodes under - /sys/block/zram<id>/ - disksize - num_reads - num_writes - failed_reads - failed_writes - invalid_io - notify_free - zero_pages - orig_data_size - compr_data_size - mem_used_total - mem_used_max +Per-device statistics are exported as various nodes under /sys/block/zram<id>/ + +A brief description of exported device attritbutes. For more details please +read Documentation/ABI/testing/sysfs-block-zram. + +Name access description +---- ------ ----------- +disksize RW show and set the device's disk size +initstate RO shows the initialization state of the device +reset WO trigger device reset +num_reads RO the number of reads +failed_reads RO the number of failed reads +num_write RO the number of writes +failed_writes RO the number of failed writes +invalid_io RO the number of non-page-size-aligned I/O requests +max_comp_streams RW the number of possible concurrent compress operations +comp_algorithm RW show and change the compression algorithm +notify_free RO the number of notifications to free pages (either + slot free notifications or REQ_DISCARD requests) +zero_pages RO the number of zero filled pages written to this disk +orig_data_size RO uncompressed size of data stored in this disk +compr_data_size RO compressed size of data stored in this disk +mem_used_total RO the amount of memory allocated for this disk +mem_used_max RW the maximum amount memory zram have consumed to + store compressed data +mem_limit RW the maximum amount of memory ZRAM can use to store + the compressed data +num_migrated RO the number of objects migrated migrated by compaction + + +File /sys/block/zram<id>/stat + +Represents block layer statistics. Read Documentation/block/stat.txt for +details. 8) Deactivate: swapoff /dev/zram0 |