linux-kernel - Re: [PATCH 0/6] kthread: Add the helper macro kthread_run_on

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Date:   Thu, 21 Oct 2021 13:48:15 +0000
From:   "Bernard Metzler" <BMT@...ich.ibm.com>
To:     "Cai Huoqing" <caihuoqing@...du.com>
Cc:     "Doug Ledford" <dledford@...hat.com>,
        "Jason Gunthorpe" <jgg@...pe.ca>,
        "Davidlohr Bueso" <dave@...olabs.net>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        "Josh Triplett" <josh@...htriplett.org>,
        "Steven Rostedt" <rostedt@...dmis.org>,
        "Mathieu Desnoyers" <mathieu.desnoyers@...icios.com>,
        "Lai Jiangshan" <jiangshanlai@...il.com>,
        "Joel Fernandes" <joel@...lfernandes.org>,
        "Ingo Molnar" <mingo@...hat.com>,
        "Daniel Bristot de Oliveira" <bristot@...nel.org>,
        <linux-rdma@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rcu@...r.kernel.org>
Subject: Re: [PATCH 0/6] kthread: Add the helper macro kthread_run_on_cpu()

-----"Cai Huoqing" <caihuoqing@...du.com> wrote: -----

>To: <caihuoqing@...du.com>
>From: "Cai Huoqing" <caihuoqing@...du.com>
>Date: 10/21/2021 02:02PM
>Cc: "Bernard Metzler" <bmt@...ich.ibm.com>, "Doug Ledford"
><dledford@...hat.com>, "Jason Gunthorpe" <jgg@...pe.ca>, "Davidlohr
>Bueso" <dave@...olabs.net>, "Paul E. McKenney" <paulmck@...nel.org>,
>"Josh Triplett" <josh@...htriplett.org>, "Steven Rostedt"
><rostedt@...dmis.org>, "Mathieu Desnoyers"
><mathieu.desnoyers@...icios.com>, "Lai Jiangshan"
><jiangshanlai@...il.com>, "Joel Fernandes" <joel@...lfernandes.org>,
>"Ingo Molnar" <mingo@...hat.com>, "Daniel Bristot de Oliveira"
><bristot@...nel.org>, <linux-rdma@...r.kernel.org>,
><linux-kernel@...r.kernel.org>, <rcu@...r.kernel.org>
>Subject: [EXTERNAL] [PATCH 0/6] kthread: Add the helper macro
>kthread_run_on_cpu()
>
>the helper macro kthread_run_on_cpu() inculdes
>kthread_create_on_cpu/wake_up_process().
>In some cases, use kthread_run_on_cpu() directly instead of
>kthread_create_on_node/kthread_bind/wake_up_process() or
>kthread_create_on_cpu/wake_up_process() or
>kthreadd_create/kthread_bind/wake_up_process() to simplify the code.

I do not see kthread_bind() being covered by the helper,
as claimed? rcutorture, ring-buffer, siw are using it in
the code potentially being replaced by the helper.
kthread_bind() is best to be called before thread starts
running, so should be part of it.

Thanks,
Bernard.
>
>Cai Huoqing (6):
>  kthread: Add the helper macro kthread_run_on_cpu()
>  RDMA/siw: Make use of the helper macro kthread_run_on_cpu()
>  ring-buffer: Make use of the helper macro kthread_run_on_cpu()
>  rcutorture: Make use of the helper macro kthread_run_on_cpu()
>  trace/osnoise: Make use of the helper macro kthread_run_on_cpu()
>  trace/hwlat: Make use of the helper macro kthread_run_on_cpu()
>
> drivers/infiniband/sw/siw/siw_main.c |  7 +++----
> include/linux/kthread.h              | 22 ++++++++++++++++++++++
> kernel/rcu/rcutorture.c              |  7 ++-----
> kernel/trace/ring_buffer.c           |  7 ++-----
> kernel/trace/trace_hwlat.c           |  6 +-----
> kernel/trace/trace_osnoise.c         |  3 +--
> 6 files changed, 31 insertions(+), 21 deletions(-)
>
>-- 
>2.25.1
>
>