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

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Message-ID: <20211021140755.GA3448@LAPTOP-UKSR4ENP.internal.baidu.com>
Date:   Thu, 21 Oct 2021 22:07:55 +0800
From:   Cai Huoqing <caihuoqing@...du.com>
To:     Bernard Metzler <BMT@...ich.ibm.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()

On 21 10月 21 13:48:15, Bernard Metzler wrote:
> -----"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.
Hi,
kthread_bind() is already part of kthread_create_on_cpu which is
called by kthread_run_on_cpu() here.

Thanks,
Cai.
> 
> 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
> >
> >