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authorVivek Goyal <vgoyal@redhat.com>2010-09-15 17:06:35 -0400
committerJens Axboe <jaxboe@fusionio.com>2010-09-16 08:42:52 +0200
commite43473b7f223ec866f7db273697e76c337c390f9 (patch)
treee90b52dbe4ec4ae37263a00e2bd9eaf5367cf72f /init/Kconfig
parent4c9eefa16c6f124ffcc736cb719b24ea27f85017 (diff)
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blkio: Core implementation of throttle policy
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>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig9
1 files changed, 6 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 2de5b1cbadd..950ba26f723 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -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.