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authorVivek Goyal <vgoyal@redhat.com>2010-04-26 19:27:56 +0200
committerJens Axboe <jens.axboe@oracle.com>2010-04-26 19:27:56 +0200
commitafc24d49c1e5dbeef745c1c1246f5ae6ebd97c71 (patch)
treec936676ed21d032bf1d27f9ff1451f6242c8b3b6 /block/Kconfig.iosched
parente5ff082e8a68d9a6874990597497c7e6a96ad752 (diff)
downloadkernel-afc24d49c1e5dbeef745c1c1246f5ae6ebd97c71.tar.gz
blk-cgroup: config options re-arrangement
This patch fixes few usability and configurability issues. o All the cgroup based controller options are configurable from "Genral Setup/Control Group Support/" menu. blkio is the only exception. Hence make this option visible in above menu and make it configurable from there to bring it inline with rest of the cgroup based controllers. o Get rid of CONFIG_DEBUG_CFQ_IOSCHED. This option currently does two things. - Enable printing of cgroup paths in blktrace - Enables CONFIG_DEBUG_BLK_CGROUP, which in turn displays additional stat files in cgroup. If we are using group scheduling, blktrace data is of not really much use if cgroup information is not present. To get this data, currently one has to also enable CONFIG_DEBUG_CFQ_IOSCHED, which in turn brings the overhead of all the additional debug stat files which is not desired. Hence, this patch moves printing of cgroup paths under CONFIG_CFQ_GROUP_IOSCHED. This allows us to get rid of CONFIG_DEBUG_CFQ_IOSCHED completely. Now all the debug stat files are controlled only by CONFIG_DEBUG_BLK_CGROUP which can be enabled through config menu. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Divyesh Shah <dpshah@google.com> Reviewed-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'block/Kconfig.iosched')
-rw-r--r--block/Kconfig.iosched16
1 files changed, 5 insertions, 11 deletions
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index fc71cf071fb2..3199b76f795d 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -23,7 +23,8 @@ config IOSCHED_DEADLINE
config IOSCHED_CFQ
tristate "CFQ I/O scheduler"
- select BLK_CGROUP if CFQ_GROUP_IOSCHED
+ # If BLK_CGROUP is a module, CFQ has to be built as module.
+ depends on (BLK_CGROUP=m && m) || !BLK_CGROUP || BLK_CGROUP=y
default y
---help---
The CFQ I/O scheduler tries to distribute bandwidth equally
@@ -33,22 +34,15 @@ config IOSCHED_CFQ
This is the default I/O scheduler.
+ Note: If BLK_CGROUP=m, then CFQ can be built only as module.
+
config CFQ_GROUP_IOSCHED
bool "CFQ Group Scheduling support"
- depends on IOSCHED_CFQ && CGROUPS
+ depends on IOSCHED_CFQ && BLK_CGROUP
default n
---help---
Enable group IO scheduling in CFQ.
-config DEBUG_CFQ_IOSCHED
- bool "Debug CFQ Scheduling"
- depends on CFQ_GROUP_IOSCHED
- select DEBUG_BLK_CGROUP
- default n
- ---help---
- Enable CFQ IO scheduling debugging in CFQ. Currently it makes
- blktrace output more verbose.
-
choice
prompt "Default I/O scheduler"
default DEFAULT_CFQ