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ARM: Allow selection HZ values
Allow users to configure the Hz rate on implementations which do not have a fixed clock rate. Whenever HZ_FIXED is not set through one of its "default" settings, the user is allowed to select a tick rate from 100, 200, 250, 300, 500Hz and 1kHz. This is slightly more choice than with the generic HZ selection in kernel/Kconfig.hz (which only does 100, 250, 300Hz and 1kHz). The reason for including 200Hz is that a greater number of other platforms want that via the fixed rate, and 500Hz just seemed to be a better middle value than 300Hz (which is of course very close to 250.) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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1 changed files with 38 additions and 2 deletions
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@ -1614,13 +1614,49 @@ config ARCH_NR_GPIO
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source kernel/Kconfig.preempt
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source kernel/Kconfig.preempt
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config HZ
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config HZ_FIXED
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int
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int
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default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
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default 200 if ARCH_EBSA110 || ARCH_S3C24XX || ARCH_S5P64X0 || \
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ARCH_S5PV210 || ARCH_EXYNOS4
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ARCH_S5PV210 || ARCH_EXYNOS4
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default AT91_TIMER_HZ if ARCH_AT91
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default AT91_TIMER_HZ if ARCH_AT91
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default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
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default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
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default 100
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choice
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depends on !HZ_FIXED
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prompt "Timer frequency"
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config HZ_100
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bool "100 Hz"
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config HZ_200
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bool "200 Hz"
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config HZ_250
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bool "250 Hz"
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config HZ_300
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bool "300 Hz"
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config HZ_500
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bool "500 Hz"
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config HZ_1000
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bool "1000 Hz"
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endchoice
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config HZ
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int
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default HZ_FIXED if HZ_FIXED
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default 100 if HZ_100
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default 200 if HZ_200
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default 250 if HZ_250
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default 300 if HZ_300
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default 500 if HZ_500
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default 1000
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config SCHED_HRTICK
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def_bool HIGH_RES_TIMERS
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config SCHED_HRTICK
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config SCHED_HRTICK
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def_bool HIGH_RES_TIMERS
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def_bool HIGH_RES_TIMERS
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