mirror of
https://github.com/torvalds/linux.git
synced 2024-12-01 00:21:32 +00:00
67523c48aa
Modify the Block I/O cgroup subsystem to be able to be built as a module. As the CFQ disk scheduler optionally depends on blk-cgroup, config options in block/Kconfig, block/Kconfig.iosched, and block/blk-cgroup.h are enhanced to support the new module dependency. Signed-off-by: Ben Blum <bblum@andrew.cmu.edu> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
79 lines
1.9 KiB
Plaintext
79 lines
1.9 KiB
Plaintext
if BLOCK
|
|
|
|
menu "IO Schedulers"
|
|
|
|
config IOSCHED_NOOP
|
|
bool
|
|
default y
|
|
---help---
|
|
The no-op I/O scheduler is a minimal scheduler that does basic merging
|
|
and sorting. Its main uses include non-disk based block devices like
|
|
memory devices, and specialised software or hardware environments
|
|
that do their own scheduling and require only minimal assistance from
|
|
the kernel.
|
|
|
|
config IOSCHED_DEADLINE
|
|
tristate "Deadline I/O scheduler"
|
|
default y
|
|
---help---
|
|
The deadline I/O scheduler is simple and compact. It will provide
|
|
CSCAN service with FIFO expiration of requests, switching to
|
|
a new point in the service tree and doing a batch of IO from there
|
|
in case of expiry.
|
|
|
|
config IOSCHED_CFQ
|
|
tristate "CFQ I/O scheduler"
|
|
select BLK_CGROUP if CFQ_GROUP_IOSCHED
|
|
default y
|
|
---help---
|
|
The CFQ I/O scheduler tries to distribute bandwidth equally
|
|
among all processes in the system. It should provide a fair
|
|
and low latency working environment, suitable for both desktop
|
|
and server systems.
|
|
|
|
This is the default I/O scheduler.
|
|
|
|
config CFQ_GROUP_IOSCHED
|
|
bool "CFQ Group Scheduling support"
|
|
depends on IOSCHED_CFQ && CGROUPS
|
|
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
|
|
help
|
|
Select the I/O scheduler which will be used by default for all
|
|
block devices.
|
|
|
|
config DEFAULT_DEADLINE
|
|
bool "Deadline" if IOSCHED_DEADLINE=y
|
|
|
|
config DEFAULT_CFQ
|
|
bool "CFQ" if IOSCHED_CFQ=y
|
|
|
|
config DEFAULT_NOOP
|
|
bool "No-op"
|
|
|
|
endchoice
|
|
|
|
config DEFAULT_IOSCHED
|
|
string
|
|
default "deadline" if DEFAULT_DEADLINE
|
|
default "cfq" if DEFAULT_CFQ
|
|
default "noop" if DEFAULT_NOOP
|
|
|
|
endmenu
|
|
|
|
endif
|