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From:   Vincent Guittot <vincent.guittot@linaro.org>
Date:   Tue, 11 May 2021 09:00:12 +0200
Message-ID: <CAKfTPtBLr9bk68q7cuFOhYfKYvigGaB+TEeGzU_p4egQXq2gLA@mail.gmail.com>
Subject: Re: [PATCH 00/19] sched: Core Scheduling
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Joel Fernandes <joel@joelfernandes.org>,
        "Hyser,Chris" <chris.hyser@oracle.com>,
        Josh Don <joshdon@google.com>, Ingo Molnar <mingo@kernel.org>,
        Valentin Schneider <valentin.schneider@arm.com>,
        Mel Gorman <mgorman@suse.de>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
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On Mon, 10 May 2021 at 18:16, Vincent Guittot
<vincent.guittot@linaro.org> wrote:
>
> Hi Peter,
>
> On Thu, 22 Apr 2021 at 14:36, Peter Zijlstra <peterz@infradead.org> wrote:
> >
> > Hai,
> >
> > This is an agressive fold of all the core-scheduling work so far. I've stripped
> > a whole bunch of tags along the way (hopefully not too many, please yell if you
> > feel I made a mistake), including tested-by. Please retest.
> >
> > Changes since the last partial post is dropping all the cgroup stuff and
> > PR_SCHED_CORE_CLEAR as well as that exec() behaviour in order to later resolve
> > the cgroup issue.
> >
> > Since we're really rather late for the coming merge window, my plan was to
> > merge the lot right after the merge window.
> >
> > Again, please test.
>
> I have run various tests with your sched/core-sched branch on my arm64
> machine: 2 numa * 28 cores * SMT4
>
> List of tests:
> perf sched pipe
> hackbench process and threads with 1,4,16,32,64,128,256 groups
> tbench with 1,4,16,32,64,128,256 groups
> Unixbench shell and exec
> reaim
>
> core-sched was compiled but not used: CONFIG_SCHED_CORE=y
>
> I haven't seen any regressions or problems; it's a mix of +/- 1-2%. I
> have only seen one significant improvement for hackbench -g 1 (+4.92%)
> that I don't really explain. Will dig a bit one this later
>
> So Tested-by: Vincent Guittot <vincent.guitto@linaro.org>

Tested-by: Vincent Guittot <vincent.guittot@linaro.org>

With the correct email address

>
>
>
> >
> > These patches should shortly be available in my queue.git.
> >
> > ---
> >  b/kernel/sched/core_sched.c                     |  229 ++++++
> >  b/tools/testing/selftests/sched/.gitignore      |    1
> >  b/tools/testing/selftests/sched/Makefile        |   14
> >  b/tools/testing/selftests/sched/config          |    1
> >  b/tools/testing/selftests/sched/cs_prctl_test.c |  338 +++++++++
> >  include/linux/sched.h                           |   19
> >  include/uapi/linux/prctl.h                      |    8
> >  kernel/Kconfig.preempt                          |    6
> >  kernel/fork.c                                   |    4
> >  kernel/sched/Makefile                           |    1
> >  kernel/sched/core.c                             |  858 ++++++++++++++++++++++--
> >  kernel/sched/cpuacct.c                          |   12
> >  kernel/sched/deadline.c                         |   38 -
> >  kernel/sched/debug.c                            |    4
> >  kernel/sched/fair.c                             |  276 +++++--
> >  kernel/sched/idle.c                             |   13
> >  kernel/sched/pelt.h                             |    2
> >  kernel/sched/rt.c                               |   31
> >  kernel/sched/sched.h                            |  393 ++++++++--
> >  kernel/sched/stop_task.c                        |   14
> >  kernel/sched/topology.c                         |    4
> >  kernel/sys.c                                    |    5
> >  tools/include/uapi/linux/prctl.h                |    8
> >  23 files changed, 2057 insertions(+), 222 deletions(-)
> >