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    Subject[PATCH 10/10] Document sysfs entries
    Date
    Signed-off-by: Nitin Gupta <ngupta@vflare.org>
    ---
    Documentation/ABI/testing/sysfs-block-zram | 99 ++++++++++++++++++++++++++++
    1 files changed, 99 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-block-zram

    diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram
    new file mode 100644
    index 0000000..c8b3b48
    --- /dev/null
    +++ b/Documentation/ABI/testing/sysfs-block-zram
    @@ -0,0 +1,99 @@
    +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.
    +
    +What: /sys/block/zram<id>/initstate
    +Date: August 2010
    +Contact: Nitin Gupta <ngupta@vflare.org>
    +Description:
    + The disksize 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 disksize file is write-only and allows resetting the
    + device. The reset operation frees all the memory assocaited
    + 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>/notify_free
    +Date: August 2010
    +Contact: Nitin Gupta <ngupta@vflare.org>
    +Description:
    + The notify_free file is read-only and specifies the number of
    + swap slot free notifications received by this device. These
    + notifications are send to a swap block device when a swap slot
    + is freed. This statistic is applicable only when this disk is
    + being used as a swap disk.
    +
    +What: /sys/block/zram<id>/discard
    +Date: August 2010
    +Contact: Nitin Gupta <ngupta@vflare.org>
    +Description:
    + The discard file is read-only and specifies the number of
    + discard requests received by this device. These requests
    + provide information to block device regarding blocks which are
    + no longer used by filesystem.
    +
    +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
    \ No newline at end of file
    --
    1.7.2.1


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