tag 9b0c5ed7a57bff31222d39f19336b4ff41696592
tagger Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tue Mar 02 20:46:34 2021 +0100
object 71821f64062a5b91b3d375b4f67a5edfcc5c01f3

Patch queue for v5.11.2-rt9

commit 71821f64062a5b91b3d375b4f67a5edfcc5c01f3
author Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tue Mar 02 20:46:34 2021 +0100
committer Sebastian Andrzej Siewior <bigeasy@linutronix.de> Tue Mar 02 20:46:34 2021 +0100
tree 25e1362fab0f6feb8597226707e9ce4635278b9e
parent 9f4eab0238cb3d1ac8ac2b2258f568ecf01ab37e

[ANNOUNCE] v5.112-rt9

Dear RT folks!

I'm pleased to announce the v5.112-rt9 patch set.

Changes since v5.112-rt8:

  - Move the cpu_chill() prototype to hrtimer.h to avoid a warning.

  - Polish the sigqueue cache patch. Its doing remains unchanged with
    one difference: The cache is now used only if the task is a realtime
    task. Previously it was also used if a task was having a realtime
    priority due to PI boost.

  - Refurbish the slub and page_alloc patches:
    - There used to be a per-CPU list for pages which should have been
      given back to the page-alloctor but the caller was atomic. The
      atomic sections from within SLUB are gone, the per-CPU list is
      gone, too.

    - The SLUB_CPU_PARTIAL switch can now be enabled. I looked at the
      resulting latency numbers and enabling leads to higher latency.
      Therefore it is off by default on RT.

    - We used to split the free process of the pcp-pages into two
      stages and so slightly decouple the IRQ-off section from the
      zone-lock section. I don't see the need to keep doing it since the
      local-lock removes all the IRQ-off regions on RT and for !RT it
      shouldn't make much difference.
      This split is gone now.

    - The alloc/free tracker sysfs file uses one PAGE size for
      collecting the results. If it runs out of space it reallocates
      more memory with disabled interrupts. The reallocation is not
      forbidden on PREEMPT_RT.

Known issues
     - kdb/kgdb can easily deadlock.
     - netconsole triggers WARN.

The delta patch against v5.112-rt8 is appended below and can be found here:

     https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.11/incr/patch-5.112-rt8-rt9.patch.xz

You can get this release via the git tree at:

    git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v5.112-rt9

The RT patch against v5.112 can be found here:

    https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.11/older/patch-5.112-rt9.patch.xz

The split quilt queue is available at:

    https://cdn.kernel.org/pub/linux/kernel/projects/rt/5.11/older/patches-5.112-rt9.tar.xz

Sebastian

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>