diff options
Diffstat (limited to 'block/Kconfig.iosched')
| -rw-r--r-- | block/Kconfig.iosched | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched new file mode 100644 index 00000000..3199b76f --- /dev/null +++ b/block/Kconfig.iosched @@ -0,0 +1,72 @@ +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" + # 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 + 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. + + 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 && BLK_CGROUP + default n + ---help--- + Enable group IO scheduling in CFQ. + +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 |