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Date: Wed, 11 Mar 2015 00:08:32 +0900 From: Sergey Senozhatsky <sergey.senozhatsky@...il.com> To: Andrew Morton <akpm@...ux-foundation.org>, Minchan Kim <minchan@...nel.org> Cc: Nitin Gupta <ngupta@...are.org>, linux-kernel@...r.kernel.org, Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com> Subject: [PATCH 4/6] 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 attrs description, because sysfs-block-zram still contains detailed information. Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com> --- Documentation/blockdev/zram.txt | 49 +++++++++++++++++++++++++++++------------ 1 file changed, 35 insertions(+), 14 deletions(-) diff --git a/Documentation/blockdev/zram.txt b/Documentation/blockdev/zram.txt index 902c97c..149b49a 100644 --- a/Documentation/blockdev/zram.txt +++ b/Documentation/blockdev/zram.txt @@ -117,20 +117,41 @@ execute echo X > /sys/class/zram-control/zram_remove 8) 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 mode description +---- ------ ----------- +disksize RO 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 of 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 by compaction +compact WO trigger memory compaction + + +File /sys/block/zram<id>/stat + +Represents block layer statistics. Read Documentation/block/stat.txt for +details. 9) Deactivate: swapoff /dev/zram0 -- 2.3.2.209.gd67f9d5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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