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blkio: Core implementation of throttle policy

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o Actual implementation of throttling policy in block layer. Currently it
  implements READ and WRITE bytes per second throttling logic. IOPS throttling
  comes in later patches.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Vivek Goyal
2010-09-15 17:06:35 -04:00
committed by Jens Axboe
parent 4c9eefa16c
commit e43473b7f2
7 changed files with 979 additions and 3 deletions
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9
init/Kconfig
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@@ -634,11 +634,14 @@ config BLK_CGROUP
Currently, CFQ IO scheduler uses it to recognize task groups and
control disk bandwidth allocation (proportional time slice allocation)
to such task groups.
to such task groups. It is also used by bio throttling logic in
block layer to implement upper limit in IO rates on a device.
This option only enables generic Block IO controller infrastructure.
One needs to also enable actual IO controlling logic in CFQ for it
to take effect. (CONFIG_CFQ_GROUP_IOSCHED=y).
One needs to also enable actual IO controlling logic/policy. For
enabling proportional weight division of disk bandwidth in CFQ seti
CONFIG_CFQ_GROUP_IOSCHED=y and for enabling throttling policy set
CONFIG_BLK_THROTTLE=y.
See Documentation/cgroups/blkio-controller.txt for more information.