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kernel/kconfig: Move TICKLESS options out of power management tree

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These options are rapidly becoming a default configuration, which is
complicated by having them be hidden inside of a SYS_POWER_MANAGEMENT
variable that has to be enabled first.  Put them at the top level of
the kernel config.

Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
This commit is contained in:
Andy Ross 2018-10-01 11:13:55 -07:00 • committed by Anas Nashif
commit 08397277fc
2 changed files with 27 additions and 27 deletions
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27
kernel/Kconfig
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@ -675,6 +675,33 @@ config MP_NUM_CPUS
endmenu endmenu
config TICKLESS_IDLE
bool "Tickless idle"
default y if SYS_POWER_MANAGEMENT
help
This option suppresses periodic system clock interrupts whenever the
kernel becomes idle. This permits the system to remain in a power
saving state for extended periods without having to wake up to
service each tick as it occurs.
config TICKLESS_IDLE_THRESH
int "Tickless idle threshold"
default 3
depends on TICKLESS_IDLE
help
This option enables clock interrupt suppression when the kernel idles
for only a short period of time. It specifies the minimum number of
ticks that must occur before the next kernel timer expires in order
for suppression to happen.
config TICKLESS_KERNEL
bool "Tickless kernel"
default n
help
This option enables a fully event driven kernel. Periodic system
clock interrupt generation would be stopped at all times. This option
requires Tickless Idle option to be enabled.
source "kernel/Kconfig.power_mgmt" source "kernel/Kconfig.power_mgmt"
endmenu endmenu

27
kernel/Kconfig.power_mgmt
View file

@ -70,31 +70,4 @@ config DEVICE_POWER_MANAGEMENT
like turning off device clocks and peripherals. The device drivers like turning off device clocks and peripherals. The device drivers
may also save and restore states in these hook functions. may also save and restore states in these hook functions.
config TICKLESS_IDLE
bool "Tickless idle"
default y
help
This option suppresses periodic system clock interrupts whenever the
kernel becomes idle. This permits the system to remain in a power
saving state for extended periods without having to wake up to
service each tick as it occurs.
config TICKLESS_IDLE_THRESH
int "Tickless idle threshold"
default 3
depends on TICKLESS_IDLE
help
This option enables clock interrupt suppression when the kernel idles
for only a short period of time. It specifies the minimum number of
ticks that must occur before the next kernel timer expires in order
for suppression to happen.
config TICKLESS_KERNEL
bool "Tickless kernel"
depends on TICKLESS_IDLE
help
This option enables a fully event driven kernel. Periodic system
clock interrupt generation would be stopped at all times. This option
requires Tickless Idle option to be enabled.
endif endif