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Date: Wed, 5 Jul 2017 09:58:57 +0100 From: Juri Lelli <juri.lelli@....com> To: peterz@...radead.org, mingo@...hat.com, rjw@...ysocki.net, viresh.kumar@...aro.org Cc: linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org, tglx@...utronix.de, vincent.guittot@...aro.org, rostedt@...dmis.org, luca.abeni@...tannapisa.it, claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it, bristot@...hat.com, mathieu.poirier@...aro.org, tkjos@...roid.com, joelaf@...gle.com, andresoportus@...gle.com, morten.rasmussen@....com, dietmar.eggemann@....com, patrick.bellasi@....com, juri.lelli@....com Subject: [RFC PATCH v1 0/8] SCHED_DEADLINE freq/cpu invariance and OPP selection Hi, v1 of the RFC set implementing frequency/cpu invariance and OPP selection for SCHED_DEADLINE [1]. The set is based on tip/sched/core as of today (72298e5c92c5), which now already includes Luca's "CPU reclaiming for SCHED_DEADLINE". Thanks a lot for reviewing RFCv0! Patches high level description: o [01-02]/08 add the necessary links to start accounting DEADLINE contribution to OPP selection o 03/08 it's a temporary solution to make possible (on ARM) to change frequency for DEADLINE tasks (that would possibly delay the SCHED_FIFO worker kthread); proper solution would be to be able to issue frequency transition from an atomic ctx o [04-05]/08 it's a schedutil change that copes with the fact that DEADLINE doesn't require periodic OPP selection triggering point o [06-07]/08 make arch_scale_{freq,cpu}_capacity() function available on !CONFIG_SMP configurations too o 08/08 implements frequency/cpu invariance for tasks' reservation parameters; which basically means that we implement GRUB-PA [2] Changes w.r.t. RFCv0: - rebase on tip/sched/core - make use of BW_SHIFT for calculations (Peter) - added a comment about guaranteed/requested frequency (Peter) - use a high bit for sched_flags SCHED_FLAG_SPECIAL hack; don't expose it to userspace and add comments (Peter) - refactor aggregation of utilization from scheduling classes Please have a look. Feedback and comments are, as usual, more than welcome. In case you would like to test this out: git://linux-arm.org/linux-jl.git upstream/deadline/freq-rfc-v1 Best, - Juri Juri Lelli (8): sched/cpufreq_schedutil: make use of DEADLINE utilization signal sched/deadline: move cpu frequency selection triggering points sched/cpufreq_schedutil: make worker kthread be SCHED_DEADLINE sched/cpufreq_schedutil: split utilization signals sched/cpufreq_schedutil: always consider all CPUs when deciding next freq sched/sched.h: remove sd arch_scale_freq_capacity parameter sched/sched.h: move arch_scale_{freq,cpu}_capacity outside CONFIG_SMP sched/deadline: make bandwidth enforcement scale-invariant include/linux/sched.h | 1 + include/linux/sched/cpufreq.h | 2 -- include/linux/sched/topology.h | 12 +++---- kernel/sched/core.c | 15 ++++++-- kernel/sched/cpufreq_schedutil.c | 77 ++++++++++++++++++++++++++-------------- kernel/sched/deadline.c | 46 ++++++++++++++++++++---- kernel/sched/fair.c | 4 +-- kernel/sched/sched.h | 51 +++++++++++++++++++------- 8 files changed, 149 insertions(+), 59 deletions(-) -- 2.11.0
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