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    Subject[RFC PATCH v1 0/8] SCHED_DEADLINE freq/cpu invariance and OPP selection
    Date
    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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