linux-kernel - [PATCH v2 0/8] scheduler tinification

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Date:   Tue,  6 Jun 2017 19:24:42 -0400
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/8] scheduler tinification

Many embedded systems don't need the full scheduler support. Most of the
time, user space is tightly controlled and many of the scheduler facilities
are simply unused.

This patch series makes it possible to configure out some parts of the
scheduler such as the deadline and realtime scheduler classes. The saving
in kernel footprint is non negligible.

Small ARM kernel config before this series:

   text    data     bss     dec     hex filename
  28623    3404     128   32155    7d9b kernel/sched/built-in.o

With this series and dl and rt classes disabled:

   text    data     bss     dec     hex filename
  20734    3334      40   24108    5e2c kernel/sched/built-in.o

A significant part of the remaining code is support for various system calls
that could be automatically removed when user space doesn't use it but that
is a topic for another day.

Changes from v1:

- the deadline class is configurable independently from the realtime class
- split of the PI futex code to make non-PI futexes available when RT
  is configured out
- removal of many #ifdefs to keep the code more readable

diffstat for this series:

 include/linux/futex.h          |    7 +-
 include/linux/init_task.h      |   15 +-
 include/linux/rtmutex.h        |   69 +
 include/linux/sched.h          |    4 +
 include/linux/sched/deadline.h |    8 +-
 include/linux/sched/rt.h       |   10 +-
 init/Kconfig                   |   28 +-
 kernel/futex.c                 | 2829 ++++++++--------------------------
 kernel/futex_pi.c              | 1563 +++++++++++++++++++
 kernel/locking/Makefile        |    3 +
 kernel/locking/locktorture.c   |    4 +-
 kernel/locking/rtmutex.c       |    6 +-
 kernel/sched/Makefile          |    7 +-
 kernel/sched/core.c            |  759 +--------
 kernel/sched/cpudeadline.h     |    7 +-
 kernel/sched/deadline.c        |  340 ++++
 kernel/sched/debug.c           |    6 +
 kernel/sched/rt.c              |  315 +++-
 kernel/sched/sched.h           |   88 +-
 kernel/sched/stop_task.c       |    6 +
 kernel/sysctl.c                |    4 +-
 kernel/time/posix-cpu-timers.c |    7 +-
 lib/Kconfig.debug              |    2 +-
 23 files changed, 3190 insertions(+), 2897 deletions(-)