linux-kernel - Re: [RFC PATCH 0/4] softirq: Per vector threading v3

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Date:   Mon, 22 Jan 2018 17:58:47 -0200
From:   Mauro Carvalho Chehab <mchehab@...pensource.com>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Levin Alexander <alexander.levin@...izon.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Radu Rendec <rrendec@...sta.com>,
        Ingo Molnar <mingo@...nel.org>,
        Stanislaw Gruszka <sgruszka@...hat.com>,
        Rik van Riel <riel@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: [RFC PATCH 0/4] softirq: Per vector threading v3

Em Fri, 19 Jan 2018 16:46:10 +0100
Frederic Weisbecker <frederic@...nel.org> escreveu:

> As per Linus suggestion, this take doesn't limit the number of occurences
> per jiffy anymore but instead defers a vector to workqueues as soon as
> it gets re-enqueued on IRQ tail.
> 
> No tunable here, so testing should be easier.
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> 	softirq/thread-v3

Frederic,

FYI, I'm out of town for two weeks. I'll try to setup a test environment
while traveling, but I'm unsure if it will work, as I won't have access to
my DVB-S2 provider from here.

> 
> HEAD: 6835e92cbd70ef4a056987d2e1ed383b294429d4
> 
> Thanks,
> 	Frederic
> ---
> 
> Frederic Weisbecker (4):
>       softirq: Limit vector to a single iteration on IRQ tail
>       softirq: Per vector deferment to workqueue
>       softirq: Defer to workqueue when rescheduling is needed
>       softirq: Replace ksoftirqd with workqueues entirely
> 
> 
>  Documentation/RCU/stallwarn.txt |   4 +-
>  include/linux/interrupt.h       |   7 +-
>  kernel/sched/cputime.c          |  12 +--
>  kernel/sched/sched.h            |   4 +-
>  kernel/softirq.c                | 223 +++++++++++++++++++++++-----------------
>  net/ipv4/tcp_output.c           |   5 +-
>  6 files changed, 144 insertions(+), 111 deletions(-)




Cheers,
Mauro