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authorLinus Walleij <linus.walleij@linaro.org>2020-04-02 11:02:39 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-04-03 12:20:06 +0300
commit8fdcca8e254ad980d083a03c3c60d8225b320ffb (patch)
tree7f662445e4be8256ee08be76e31e95fc02969a31 /drivers/cpufreq
parenta00ec3874e7d326ab2dffbed92faddf6a77a84e9 (diff)
downloadlinux-8fdcca8e254ad980d083a03c3c60d8225b320ffb.tar.xz
cpufreq: Select schedutil when using big.LITTLE
When we are using a system with big.LITTLE HMP configuration, we need to use EAS to schedule the system. As can be seen from kernel/sched/topology.c: "EAS can be used on a root domain if it meets all the following conditions: 1. an Energy Model (EM) is available; 2. the SD_ASYM_CPUCAPACITY flag is set in the sched_domain hierarchy. 3. no SMT is detected. 4. the EM complexity is low enough to keep scheduling overheads low; 5. schedutil is driving the frequency of all CPUs of the rd;" This means that at the very least, schedutil needs to be available as a scheduling policy for EAS to work on these systems. Make this explicit by defaulting to the schedutil governor if BIG_LITTLE is selected. Currently users of the TC2 board (like me) has to figure these dependencies out themselves and it is not helpful. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Sudeep Holla <sudeep.holla@arm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig
index 9f0e7e79ed14..c3e6bd59e920 100644
--- a/drivers/cpufreq/Kconfig
+++ b/drivers/cpufreq/Kconfig
@@ -37,6 +37,7 @@ config CPU_FREQ_STAT
choice
prompt "Default CPUFreq governor"
default CPU_FREQ_DEFAULT_GOV_USERSPACE if ARM_SA1100_CPUFREQ || ARM_SA1110_CPUFREQ
+ default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if BIG_LITTLE
default CPU_FREQ_DEFAULT_GOV_SCHEDUTIL if X86_INTEL_PSTATE && SMP
default CPU_FREQ_DEFAULT_GOV_PERFORMANCE
help