linux-kernel - [RFC PATCH 0/5] softirq: Per vector threading v2

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Message-Id: <1516077640-19718-1-git-send-email-frederic@kernel.org>
Date:   Tue, 16 Jan 2018 05:40:35 +0100
From:   Frederic Weisbecker <frederic@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Frederic Weisbecker <frederic@...nel.org>,
        Levin Alexander <alexander.levin@...izon.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Dmitry Safonov <dima@...sta.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eric Dumazet <edumazet@...gle.com>,
        Radu Rendec <rrendec@...sta.com>,
        Ingo Molnar <mingo@...nel.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Miller <davem@...emloft.net>
Subject: [RFC PATCH 0/5] softirq: Per vector threading v2

So this set is in a testable state. I addressed preliminary reviews from
Eric Dumazet, Paolo Abeni and Linus.

You may want to play with MAX_SOFTIRQ_RESTART value, which is now the
number of calls allowed for a vector in a jiffy frame before it gets
queued to the workqueue. I set it to the arbitrary value of 20 which is
likely too low.

Also I'm not sure about the last patch. For example in the usecase of
Dmitry Safonov it may be better not to apply it. I guess only testing
and reviews can tell.

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	softirq/thread

HEAD: 5a4c02b25bdcd853e3874d5319492ea6097f6e70

Thanks,
	Frederic
---

Frederic Weisbecker (5):
      softirq: Account time and iteration stats per vector
      softirq: Per vector deferment to workqueue
      softirq: Defer to workqueue when rescheduling is needed
      softirq: Replace ksoftirqd with workqueues entirely
      softirq: Reset vector call counter before workqueue completion


 Documentation/RCU/stallwarn.txt |   4 +-
 include/linux/interrupt.h       |   7 +-
 kernel/sched/cputime.c          |  12 +--
 kernel/sched/sched.h            |   4 +-
 kernel/softirq.c                | 232 +++++++++++++++++++++++++---------------
 net/ipv4/tcp_output.c           |   5 +-
 6 files changed, 161 insertions(+), 103 deletions(-)