[GitHub/mt8127/android_kernel_alcatel_ttab.git] / block / Kconfig.iosched

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_AS
	tristate "Anticipatory I/O scheduler"
	default y
	---help---
	  The anticipatory I/O scheduler is generally a good choice for most
	  environments, but is quite large and complex when compared to the
	  deadline I/O scheduler, it can also be slower in some cases
	  especially some database loads.

config IOSCHED_DEADLINE
	tristate "Deadline I/O scheduler"
	default y
	---help---
	  The deadline I/O scheduler is simple and compact, and is often as
	  good as the anticipatory I/O scheduler, and in some database
	  workloads, better. In the case of a single process performing I/O to
	  a disk at any one time, its behaviour is almost identical to the
	  anticipatory I/O scheduler and so is a good choice.

config IOSCHED_CFQ
	tristate "CFQ I/O scheduler"
	default y
	---help---
	  The CFQ I/O scheduler tries to distribute bandwidth equally
	  among all processes in the system. It should provide a fair
	  working environment, suitable for desktop systems.
	  This is the default I/O scheduler.

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_AS
		bool "Anticipatory" if IOSCHED_AS=y

	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 "anticipatory" if DEFAULT_AS
	default "deadline" if DEFAULT_DEADLINE
	default "cfq" if DEFAULT_CFQ
	default "noop" if DEFAULT_NOOP

endmenu

endif
Commit	Line	Data
9361401e	1	if BLOCK
1da177e4 LT	2
	3	menu "IO Schedulers"
	4
	5	config IOSCHED_NOOP
	6	bool
	7	default y
	8	---help---
	9	The no-op I/O scheduler is a minimal scheduler that does basic merging
	10	and sorting. Its main uses include non-disk based block devices like
	11	memory devices, and specialised software or hardware environments
	12	that do their own scheduling and require only minimal assistance from
	13	the kernel.
	14
	15	config IOSCHED_AS
	16	tristate "Anticipatory I/O scheduler"
	17	default y
	18	---help---
a8e14b95 JJ	19	The anticipatory I/O scheduler is generally a good choice for most
	20	environments, but is quite large and complex when compared to the
	21	deadline I/O scheduler, it can also be slower in some cases
	22	especially some database loads.
1da177e4 LT	23
	24	config IOSCHED_DEADLINE
	25	tristate "Deadline I/O scheduler"
	26	default y
	27	---help---
	28	The deadline I/O scheduler is simple and compact, and is often as
	29	good as the anticipatory I/O scheduler, and in some database
	30	workloads, better. In the case of a single process performing I/O to
	31	a disk at any one time, its behaviour is almost identical to the
	32	anticipatory I/O scheduler and so is a good choice.
	33
	34	config IOSCHED_CFQ
	35	tristate "CFQ I/O scheduler"
	36	default y
	37	---help---
	38	The CFQ I/O scheduler tries to distribute bandwidth equally
	39	among all processes in the system. It should provide a fair
	40	working environment, suitable for desktop systems.
a8e14b95	41	This is the default I/O scheduler.
1da177e4	42
131dda7f ND	43	choice
131dda7f ND	44	prompt "Default I/O scheduler"
b17fd9bc	45	default DEFAULT_CFQ
131dda7f ND	46	help
	47	Select the I/O scheduler which will be used by default for all
	48	block devices.
	49
	50	config DEFAULT_AS
c6ea2ba7	51	bool "Anticipatory" if IOSCHED_AS=y
131dda7f ND	52
131dda7f ND	53	config DEFAULT_DEADLINE
c6ea2ba7	54	bool "Deadline" if IOSCHED_DEADLINE=y
131dda7f ND	55
131dda7f ND	56	config DEFAULT_CFQ
c6ea2ba7	57	bool "CFQ" if IOSCHED_CFQ=y
131dda7f ND	58
	59	config DEFAULT_NOOP
	60	bool "No-op"
	61
	62	endchoice
	63
	64	config DEFAULT_IOSCHED
	65	string
	66	default "anticipatory" if DEFAULT_AS
	67	default "deadline" if DEFAULT_DEADLINE
	68	default "cfq" if DEFAULT_CFQ
	69	default "noop" if DEFAULT_NOOP
	70
1da177e4	71	endmenu
9361401e DH	72
9361401e DH	73	endif