From: Paolo Valente <paolo.vale...@unimore.it>
Original patch taken from:
http://algo.ing.unimo.it/people/paolo/disk_sched/patches/3.14.0-v7r5
Update Kconfig.iosched and do the related Makefile changes to include
kernel configuration options for BFQ. Also add the bfqio controller
to the cgroups subsystem.
Signed-off-by: Paolo Valente <paolo.vale...@unimore.it>
Signed-off-by: Arianna Avanzini <avanzini.aria...@gmail.com>
Signed-off-by: Jianchuan Wang <jianchuan.w...@windriver.com>
---
block/Kconfig.iosched | 32 ++++++++++++++++++++++++++++++++
block/Makefile | 1 +
include/linux/cgroup_subsys.h | 4 ++++
3 files changed, 37 insertions(+)
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
index 421bef9..0ee5f0f 100644
--- a/block/Kconfig.iosched
+++ b/block/Kconfig.iosched
@@ -39,6 +39,27 @@ config CFQ_GROUP_IOSCHED
---help---
Enable group IO scheduling in CFQ.
+config IOSCHED_BFQ
+ tristate "BFQ I/O scheduler"
+ default n
+ ---help---
+ The BFQ I/O scheduler tries to distribute bandwidth among
+ all processes according to their weights.
+ It aims at distributing the bandwidth as desired, independently of
+ the disk parameters and with any workload. It also tries to
+ guarantee low latency to interactive and soft real-time
+ applications. If compiled built-in (saying Y here), BFQ can
+ be configured to support hierarchical scheduling.
+
+config CGROUP_BFQIO
+ bool "BFQ hierarchical scheduling support"
+ depends on CGROUPS && IOSCHED_BFQ=y
+ default n
+ ---help---
+ Enable hierarchical scheduling in BFQ, using the cgroups
+ filesystem interface. The name of the subsystem will be
+ bfqio.
+
choice
prompt "Default I/O scheduler"
default DEFAULT_CFQ
@@ -52,6 +73,16 @@ choice
config DEFAULT_CFQ
bool "CFQ" if IOSCHED_CFQ=y
+ config DEFAULT_BFQ
+ bool "BFQ" if IOSCHED_BFQ=y
+ help
+ Selects BFQ as the default I/O scheduler which will be
+ used by default for all block devices.
+ The BFQ I/O scheduler aims at distributing the bandwidth
+ as desired, independently of the disk parameters and with
+ any workload. It also tries to guarantee low latency to
+ interactive and soft real-time applications.
+
config DEFAULT_NOOP
bool "No-op"
@@ -61,6 +92,7 @@ config DEFAULT_IOSCHED
string
default "deadline" if DEFAULT_DEADLINE
default "cfq" if DEFAULT_CFQ
+ default "bfq" if DEFAULT_BFQ
default "noop" if DEFAULT_NOOP
endmenu
diff --git a/block/Makefile b/block/Makefile
index 20645e8..cbd83fb 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -16,6 +16,7 @@ obj-$(CONFIG_BLK_DEV_THROTTLING) += blk-throttle.o
obj-$(CONFIG_IOSCHED_NOOP) += noop-iosched.o
obj-$(CONFIG_IOSCHED_DEADLINE) += deadline-iosched.o
obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o
+obj-$(CONFIG_IOSCHED_BFQ) += bfq-iosched.o
obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o
obj-$(CONFIG_BLK_DEV_INTEGRITY) += blk-integrity.o
diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
index 7b99d71..4e8c0ff 100644
--- a/include/linux/cgroup_subsys.h
+++ b/include/linux/cgroup_subsys.h
@@ -39,6 +39,10 @@ SUBSYS(net_cls)
SUBSYS(blkio)
#endif
+#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_BFQIO)
+SUBSYS(bfqio)
+#endif
+
#if IS_SUBSYS_ENABLED(CONFIG_CGROUP_PERF)
SUBSYS(perf)
#endif
--
1.9.1
--
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