linux-kernel - [PATCH 0/8] tick/nohz updates v2

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210422120158.33629-1-frederic@kernel.org>
Date:   Thu, 22 Apr 2021 14:01:50 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Yunfeng Ye <yeyunfeng@...wei.com>,
        Marcelo Tosatti <mtosatti@...hat.com>
Subject: [PATCH 0/8] tick/nohz updates v2

This set brings various interrupts reducing while running in nohz_full:

* Remove one tick interrupt while waking up from idle to a user task
  running in nohz_full mode. (thanks Yunfeng Ye).

* Reduce IPIs when running posix cpu timers, only relevant tasks should
  be interrupted now instead of all tick nohz CPUs (thanks Marcelo)

And a few other cleanups and improvement.

Changes since last take:

- Remove "tick/nohz: Prevent tick_nohz_get_sleep_length() from returning negative value"
  since the issue has been solve on the cpuidle side.

- Remove "timer: Report ignored local enqueue in nohz mode"
  and hope that objtool will spot the future offenders.

- Changed "tick/nohz: Add tick_nohz_full_this_cpu()" and provide with
  "tick/nohz: Evaluate the CPU expression after the static key" (please
  add your SOB on this one).

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	timers/nohz-v2

HEAD: 4546d43a9938f6c7eec024f005cb240b8b73637b

Thanks,
	Frederic
---

Frederic Weisbecker (3):
      tick/nohz: Remove superflous check for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
      tick/nohz: Update nohz_full Kconfig help
      tick/nohz: Only wakeup a single target cpu when kicking a task

Marcelo Tosatti (2):
      tick/nohz: Change signal tick dependency to wakeup CPUs of member tasks
      tick/nohz: Kick only _queued_ task whose tick dependency is updated

Yunfeng Ye (2):
      tick/nohz: Conditionally restart tick on idle exit
      tick/nohz: Update idle_exittime on actual idle exit

Peter Zijlstra (1):
      tick/nohz: Evaluate the CPU expression after the static key


 include/linux/sched.h          |   2 +
 include/linux/tick.h           |  26 +++++----
 kernel/sched/core.c            |   5 ++
 kernel/time/Kconfig            |  11 ++--
 kernel/time/posix-cpu-timers.c |   4 +-
 kernel/time/tick-sched.c       | 122 +++++++++++++++++++++++++++++------------
 6 files changed, 117 insertions(+), 53 deletions(-)