From: Ionela Voinescu <ionela.voinescu@arm.com> To: mingo@redhat.com, peterz@infradead.org, vincent.guittot@linaro.org, catalin.marinas@arm.com, will@kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org Cc: dietmar.eggemann@arm.com, qperret@google.com, valentin.schneider@arm.com, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, ionela.voinescu@arm.com Subject: [PATCH v2 0/3] condition EAS enablement on FI support Date: Tue, 29 Sep 2020 21:54:39 +0100 [thread overview] Message-ID: <20200929205442.24792-1-ionela.voinescu@arm.com> (raw) Given the maturity gained by cpufreq-based Frequency Invariance (FI) support following the patches at [1], this series conditions Energy Aware Scheduling (EAS) enablement on a frequency invariant system. Currently, EAS can be enabled on a system without FI support, leading to incorrect (energy-wise) task placements. As no warning is emitted, it could take some debugging effort to track the behavior back to the lack of FI support; this series changes that by disabling EAS (and advertising it) when FI support is missing. The series is structured as follows: - 1/3 - create function that can rebuild the scheduling and EAS' performance domains if EAS' initial conditions change - 2/3 - arm64: rebuild scheduling and performance domains in the case of late, counter-driven FI initialisation. - 3/3 - condition EAS enablement on FI support This series is based on linux-next 20200928. This series depends on patches at [1] which are now in the linux-next/20200928 base. v1 -> v2: - v1 can be found at [2] - 1/2 - moved now "static inline" rebuild_sched_domains_energy() stub in sched/topology.h header, as suggested by Quentin. - Changed the order of 2/3 and 3/3 to maintain bisection as suggested by Quentin. - 3/3 - place the warning under sched_debug() as per Quentin and Dietmar's recommendations. [1] Most recent version at: https://lore.kernel.org/lkml/20200901205549.30096-1-ionela.voinescu@arm.com/ [2] https://lore.kernel.org/lkml/20200924123937.20938-1-ionela.voinescu@arm.com/ Many thanks, Ionela. Ionela Voinescu (3): sched/topology,schedutil: wrap sched domains rebuild arm64: rebuild sched domains on invariance status changes sched/topology: condition EAS enablement on FIE support arch/arm64/kernel/topology.c | 10 ++++++++++ include/linux/sched/topology.h | 8 ++++++++ kernel/sched/cpufreq_schedutil.c | 9 +-------- kernel/sched/topology.c | 27 ++++++++++++++++++++------- 4 files changed, 39 insertions(+), 15 deletions(-) base-commit: 663b07a45f972c23ac315fd690874bc00977fe99 -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Ionela Voinescu <ionela.voinescu@arm.com> To: mingo@redhat.com, peterz@infradead.org, vincent.guittot@linaro.org, catalin.marinas@arm.com, will@kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org Cc: linux-pm@vger.kernel.org, qperret@google.com, linux-kernel@vger.kernel.org, dietmar.eggemann@arm.com, ionela.voinescu@arm.com, valentin.schneider@arm.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/3] condition EAS enablement on FI support Date: Tue, 29 Sep 2020 21:54:39 +0100 [thread overview] Message-ID: <20200929205442.24792-1-ionela.voinescu@arm.com> (raw) Given the maturity gained by cpufreq-based Frequency Invariance (FI) support following the patches at [1], this series conditions Energy Aware Scheduling (EAS) enablement on a frequency invariant system. Currently, EAS can be enabled on a system without FI support, leading to incorrect (energy-wise) task placements. As no warning is emitted, it could take some debugging effort to track the behavior back to the lack of FI support; this series changes that by disabling EAS (and advertising it) when FI support is missing. The series is structured as follows: - 1/3 - create function that can rebuild the scheduling and EAS' performance domains if EAS' initial conditions change - 2/3 - arm64: rebuild scheduling and performance domains in the case of late, counter-driven FI initialisation. - 3/3 - condition EAS enablement on FI support This series is based on linux-next 20200928. This series depends on patches at [1] which are now in the linux-next/20200928 base. v1 -> v2: - v1 can be found at [2] - 1/2 - moved now "static inline" rebuild_sched_domains_energy() stub in sched/topology.h header, as suggested by Quentin. - Changed the order of 2/3 and 3/3 to maintain bisection as suggested by Quentin. - 3/3 - place the warning under sched_debug() as per Quentin and Dietmar's recommendations. [1] Most recent version at: https://lore.kernel.org/lkml/20200901205549.30096-1-ionela.voinescu@arm.com/ [2] https://lore.kernel.org/lkml/20200924123937.20938-1-ionela.voinescu@arm.com/ Many thanks, Ionela. Ionela Voinescu (3): sched/topology,schedutil: wrap sched domains rebuild arm64: rebuild sched domains on invariance status changes sched/topology: condition EAS enablement on FIE support arch/arm64/kernel/topology.c | 10 ++++++++++ include/linux/sched/topology.h | 8 ++++++++ kernel/sched/cpufreq_schedutil.c | 9 +-------- kernel/sched/topology.c | 27 ++++++++++++++++++++------- 4 files changed, 39 insertions(+), 15 deletions(-) base-commit: 663b07a45f972c23ac315fd690874bc00977fe99 -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-09-29 21:05 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-09-29 20:54 Ionela Voinescu [this message] 2020-09-29 20:54 ` [PATCH v2 0/3] condition EAS enablement on FI support Ionela Voinescu 2020-09-29 20:54 ` [PATCH v2 1/3] sched/topology,schedutil: wrap sched domains rebuild Ionela Voinescu 2020-09-29 20:54 ` Ionela Voinescu 2020-09-29 20:54 ` [PATCH v2 2/3] arm64: rebuild sched domains on invariance status changes Ionela Voinescu 2020-09-29 20:54 ` Ionela Voinescu 2020-09-29 20:54 ` [PATCH v2 3/3] sched/topology: condition EAS enablement on FIE support Ionela Voinescu 2020-09-29 20:54 ` Ionela Voinescu
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