linux-kernel - [PATCH 0/5] sched: Make CONFIG_SCHED

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Message-ID: <20250317104257.3496611-1-mingo@kernel.org>
Date: Mon, 17 Mar 2025 11:42:51 +0100
From: Ingo Molnar <mingo@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Dietmar Eggemann <dietmar.eggemann@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Shrikanth Hegde <sshegde@...ux.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Valentin Schneider <vschneid@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Mel Gorman <mgorman@...e.de>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH 0/5] sched: Make CONFIG_SCHED_DEBUG features unconditional

For more than a decade, CONFIG_SCHED_DEBUG=y has been enabled
in all the major Linux distributions:

   /boot/config-6.11.0-19-generic:CONFIG_SCHED_DEBUG=y

The reason is that while originally CONFIG_SCHED_DEBUG started
out as a debugging feature, over the years (decades ...) it has
grown various bits of statistics, instrumentation and
control knobs that are useful for sysadmin and general software
development purposes as well.

But within the kernel we still pretend that there's a choice,
and sometimes code that is seemingly 'debug only' creates overhead
that should be optimized in reality.

So make it all official and make CONFIG_SCHED_DEBUG unconditional.
This gets rid of a large amount of #ifdefs, so good riddance ...

Ingo Molnar (5):
  sched/debug: Change SCHED_WARN_ON() to WARN_ON_ONCE()
  sched/debug: Make 'const_debug' tunables unconditional __read_mostly
  sched/debug: Make CONFIG_SCHED_DEBUG functionality unconditional
  sched/debug, Documentation: Remove (most) CONFIG_SCHED_DEBUG references from documentation
  sched/debug: Remove CONFIG_SCHED_DEBUG

 Documentation/scheduler/sched-debug.rst                         |  2 +-
 Documentation/scheduler/sched-design-CFS.rst                    |  2 +-
 Documentation/scheduler/sched-domains.rst                       |  5 +-
 Documentation/scheduler/sched-ext.rst                           |  3 +-
 Documentation/scheduler/sched-stats.rst                         |  2 +-
 Documentation/translations/sp_SP/scheduler/sched-design-CFS.rst |  2 +-
 fs/proc/base.c                                                  |  7 ---
 include/linux/energy_model.h                                    |  2 -
 include/linux/sched/debug.h                                     |  2 -
 include/linux/sched/topology.h                                  |  4 --
 include/trace/events/sched.h                                    |  2 -
 kernel/sched/build_utility.c                                    |  4 +-
 kernel/sched/core.c                                             | 46 ++++++----------
 kernel/sched/core_sched.c                                       |  2 +-
 kernel/sched/deadline.c                                         | 14 +++--
 kernel/sched/ext.c                                              |  2 +-
 kernel/sched/fair.c                                             | 64 +++++++++++-----------
 kernel/sched/rt.c                                               |  7 +--
 kernel/sched/sched.h                                            | 83 +++++------------------------
 kernel/sched/stats.h                                            |  2 +-
 kernel/sched/topology.c                                         | 13 -----
 lib/Kconfig.debug                                               |  9 ----
 22 files changed, 79 insertions(+), 200 deletions(-)

-- 
2.45.2