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block: cgroups, kconfig, build bits for BFQ-v7r11-4.4.0

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Update Kconfig.iosched and do the related Makefile changes to include
kernel configuration options for BFQ. Also increase the number of
policies supported by the blkio controller so that BFQ can add its
own.

Signed-off-by: Paolo Valente <paolo.valente@unimore.it>
Signed-off-by: Arianna Avanzini <avanzini@google.com>
Signed-off-by: Luca Grifo <lg@linux.com>
Signed-off-by: djb77 <dwayne.bakewell@gmail.com>
This commit is contained in:
Paolo Valente 2015-04-07 13:39:12 +02:00 committed by prashantpaddune
parent 24871cea54
commit 97bf962ea5
3 changed files with 34 additions and 1 deletions
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32
block/Kconfig.iosched
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@ -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

1
block/Makefile
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@ -18,6 +18,7 @@ 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_CMDLINE_PARSER) += cmdline-parser.o

2
include/linux/blkdev.h
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@ -48,7 +48,7 @@ struct pr_ops;
* Maximum number of blkcg policies allowed to be registered concurrently.
* Defined here to simplify include dependency.
*/
#define BLKCG_MAX_POLS 2
#define BLKCG_MAX_POLS 3
struct request;
typedef void (rq_end_io_fn)(struct request *, int);