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authorLinus Walleij <linus.walleij@linaro.org>2020-04-02 10:02:39 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2020-04-03 11:20:06 +0200
commit8fdcca8e254ad980d083a03c3c60d8225b320ffb (patch)
tree7f662445e4be8256ee08be76e31e95fc02969a31 /kernel/trace/trace_stack.c
parenta00ec3874e7d326ab2dffbed92faddf6a77a84e9 (diff)
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 'kernel/trace/trace_stack.c')
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