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Commit 005411ea authored by Joe Lawrence's avatar Joe Lawrence Committed by Jens Axboe
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doc: update block/queue-sysfs.txt entries 



Add descriptions for dax, io_poll, and write_same_max_bytes files.

Signed-off-by: default avatarJoe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent c21377f8

Documentation/block/queue-sysfs.txt

+18 −0
Original line number Diff line number Diff line
@@ -14,6 +14,12 @@ add_random (RW) 
This file allows to turn off the disk entropy contribution. Default

value of this file is '1'(on).



dax (RO)

--------

This file indicates whether the device supports Direct Access (DAX),

used by CPU-addressable storage to bypass the pagecache.  It shows '1'

if true, '0' if not.



discard_granularity (RO)

-----------------------

This shows the size of internal allocation of the device in bytes, if
@@ -46,6 +52,12 @@ hw_sector_size (RO) 
-------------------

This is the hardware sector size of the device, in bytes.



io_poll (RW)

------------

When read, this file shows the total number of block IO polls and how

many returned success.  Writing '0' to this file will disable polling

for this device.  Writing any non-zero value will enable this feature.



iostats (RW)

-------------

This file is used to control (on/off) the iostats accounting of the
@@ -151,5 +163,11 @@ device state. This means that it might not be safe to toggle the 
setting from "write back" to "write through", since that will also

eliminate cache flushes issued by the kernel.



write_same_max_bytes (RO)

-------------------------

This is the number of bytes the device can write in a single write-same

command.  A value of '0' means write-same is not supported by this

device.





Jens Axboe <jens.axboe@oracle.com>, February 2009