linux-kernel - [patch 0/5] sched: Miscellaneous RT related tweaks

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Message-ID: <20210928122339.502270600@linutronix.de>
Date:   Tue, 28 Sep 2021 14:24:23 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: [patch 0/5] sched: Miscellaneous RT related tweaks

RT enabled kernels have a few issues with the inner workings of the
scheduler:

   - The remote TTWU_QUEUE mechanism leads to 5x larger maximum latencies

   - The batched migration limit of 32 tasks causes large latencies

   - The cleanup of kprobes, vmapped stacks of dead tasks and mmdrop() are
     latency sources and eventually calling into code pathes which take
     regular spinlocks from within the scheduler core which has preemption
     disabled.

The following series cleans this up. It is also available from git:

    git://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git sched

applied on top of the previous might_sleep() cleanups:

    https://lore.kernel.org/r/20210923164145.466686140@linutronix.de

Thanks,

	tglx
---
 include/linux/mm_types.h |    4 ++++
 include/linux/sched/mm.h |   20 ++++++++++++++++++++
 kernel/exit.c            |    7 +++++++
 kernel/fork.c            |   18 +++++++++++++++++-
 kernel/kprobes.c         |    8 ++++----
 kernel/sched/core.c      |   16 +++++++++-------
 kernel/sched/features.h  |    5 +++++
 7 files changed, 66 insertions(+), 12 deletions(-)