From: Steven Rostedt <rostedt@goodmis.org>
To: Cai Huoqing <caihuoqing@baidu.com>
Cc: Bernard Metzler <bmt@zurich.ibm.com>,
Doug Ledford <dledford@redhat.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
Davidlohr Bueso <dave@stgolabs.net>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Triplett <josh@joshtriplett.org>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Lai Jiangshan <jiangshanlai@gmail.com>,
Joel Fernandes <joel@joelfernandes.org>,
Ingo Molnar <mingo@redhat.com>,
Daniel Bristot de Oliveira <bristot@kernel.org>,
<linux-rdma@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<rcu@vger.kernel.org>
Subject: Re: [PATCH 1/6] kthread: Add the helper macro kthread_run_on_cpu()
Date: Thu, 21 Oct 2021 09:10:01 -0400 [thread overview]
Message-ID: <20211021091001.26c24d5b@gandalf.local.home> (raw)
In-Reply-To: <20211021120135.3003-2-caihuoqing@baidu.com>
On Thu, 21 Oct 2021 20:01:30 +0800
Cai Huoqing <caihuoqing@baidu.com> wrote:
> the helper macro kthread_run_on_cpu() inculdes
"includes"
> 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.
>
> Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
> ---
> include/linux/kthread.h | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/include/linux/kthread.h b/include/linux/kthread.h
> index 346b0f269161..dfd125523aa9 100644
> --- a/include/linux/kthread.h
> +++ b/include/linux/kthread.h
> @@ -56,6 +56,28 @@ bool kthread_is_per_cpu(struct task_struct *k);
> __k; \
> })
>
> +/**
> + * kthread_run_on_cpu - create and wake a cpu bound thread.
> + * @threadfn: the function to run until signal_pending(current).
> + * @data: data ptr for @threadfn.
> + * @cpu: The cpu on which the thread should be bound,
> + * @namefmt: printf-style name for the thread. Format is restricted
> + * to "name.*%u". Code fills in cpu number.
> + *
> + * Description: Convenient wrapper for kthread_create_on_node()
> + * followed by wake_up_process(). Returns the kthread or
> + * ERR_PTR(-ENOMEM).
> + */
> +#define kthread_run_on_cpu(threadfn, data, cpu, namefmt) \
Why is this a macro and not a static inline function?
-- Steve
> +({ \
> + struct task_struct *__k \
> + = kthread_create_on_cpu(threadfn, data, cpu_to_node(cpu), \
> + namefmt); \
> + if (!IS_ERR(__k)) \
> + wake_up_process(__k); \
> + __k; \
> +})
> +
> void free_kthread_struct(struct task_struct *k);
> void kthread_bind(struct task_struct *k, unsigned int cpu);
> void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);
next prev parent reply other threads:[~2021-10-21 13:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-21 12:01 [PATCH 0/6] kthread: Add the helper macro kthread_run_on_cpu() Cai Huoqing
2021-10-21 12:01 ` [PATCH 1/6] " Cai Huoqing
2021-10-21 13:10 ` Steven Rostedt [this message]
2021-10-21 13:53 ` Cai Huoqing
2021-10-21 13:58 ` Steven Rostedt
2021-10-22 3:05 ` Cai Huoqing
2021-10-21 12:01 ` [PATCH 2/6] RDMA/siw: Make use of " Cai Huoqing
2021-10-21 12:01 ` [PATCH 3/6] ring-buffer: " Cai Huoqing
2021-10-21 12:01 ` [PATCH 4/6] rcutorture: " Cai Huoqing
2021-10-21 12:01 ` [PATCH 5/6] trace/osnoise: " Cai Huoqing
2021-10-21 12:01 ` [PATCH 6/6] trace/hwlat: " Cai Huoqing
2021-10-21 13:48 ` [PATCH 0/6] kthread: Add " Bernard Metzler
2021-10-21 14:07 ` Cai Huoqing
2021-10-21 14:14 ` Bernard Metzler
2021-10-21 13:58 ` Cai,Huoqing
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