linux-kernel - [RT PATCH 0/8] migrate disable fixes and performance

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Date:   Sat, 27 Jul 2019 00:56:30 -0500
From:   Scott Wood <swood@...hat.com>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Clark Williams <williams@...hat.com>,
        linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: [RT PATCH 0/8] migrate disable fixes and performance

With these patches, a kernel build on a 104-cpu machine took around 75%
less wall time and 85% less system time.  Note that there is a difference
in v5.2-rt compared to v5.0-rt.  The performance with these patches is
similar in both cases, but without these patches v5.2-rt is substantially
slower.  In v5.0-rt with a previous version of these patches, lazy
migrate disable reduced kernel build time by around 15-20% wall and
70-75% system.

Scott Wood (8):
  sched: migrate_enable: Use sleeping_lock to indicate involuntary sleep
  sched: __set_cpus_allowed_ptr: Check cpus_mask, not cpus_ptr
  sched: Remove dead __migrate_disabled() check
  sched: migrate disable: Protect cpus_ptr with lock
  sched/deadline: Reclaim cpuset bandwidth in .migrate_task_rq()
  sched: migrate_enable: Set state to TASK_RUNNING
  sched: migrate_enable: Use select_fallback_rq()
  sched: Lazy migrate_disable processing

 include/linux/cpu.h      |   4 -
 include/linux/sched.h    |  15 ++--
 init/init_task.c         |   4 +
 kernel/cpu.c             |  97 ++++++++---------------
 kernel/rcu/tree_plugin.h |   2 +-
 kernel/sched/core.c      | 200 +++++++++++++++++++----------------------------
 kernel/sched/deadline.c  |  67 ++++++++--------
 kernel/sched/sched.h     |   4 +
 lib/smp_processor_id.c   |   3 +
 9 files changed, 166 insertions(+), 230 deletions(-)

-- 
1.8.3.1