linux-kernel - [PATCH 0/5] irq: Reorder time handling against HARDIRQ

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Date:   Wed,  2 Dec 2020 12:57:27 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: [PATCH 0/5] irq: Reorder time handling against HARDIRQ_OFFSET on IRQ entry v3


Slightly different design this time. As per Peter and Thomas reviews and
suggestions, use the following layout:

  account_softirq_enter() -> irqtime_account_irq(curr, SOFTIRQ_OFFSET);
  account_softirq_exit()  -> irqtime_account_irq(curr, 0);
  account_hardirq_enter() -> irqtime_account_irq(curr, HARDIRQ_OFFSET);
  account_hardirq_exit()  -> irqtime_account_irq(curr, 0);

So now the preempt count offset is substracted in the cputime dispatch
function and the resulting code is better consolidated.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	irq/core-v3

HEAD: 24a2d6c76759bd4496cbdcd365012c821a984eec

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      sched/cputime: Remove symbol exports from IRQ time accounting
      s390/vtime: Use the generic IRQ entry accounting
      sched/vtime: Consolidate IRQ time accounting
      irqtime: Move irqtime entry accounting after irq offset incrementation
      irq: Call tick_irq_enter() inside HARDIRQ_OFFSET


 arch/Kconfig                  |  7 +++++-
 arch/ia64/kernel/time.c       | 20 ++++++++++++----
 arch/powerpc/kernel/time.c    | 56 ++++++++++++++++++++++++++++++-------------
 arch/s390/Kconfig             |  1 +
 arch/s390/include/asm/vtime.h |  1 -
 arch/s390/kernel/vtime.c      | 51 +++++++++++++++++++++++++--------------
 include/linux/hardirq.h       |  4 ++--
 include/linux/vtime.h         | 42 +++++++++++++++++++-------------
 kernel/sched/cputime.c        | 36 +++++++++++++---------------
 kernel/softirq.c              | 20 +++++++---------
 10 files changed, 148 insertions(+), 90 deletions(-)