* [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu()
@ 2021-10-22 2:57 Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 1/6] " Cai Huoqing
` (5 more replies)
0 siblings, 6 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
the helper function kthread_run_on_cpu() 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.
v1->v2:
*Remove cpu_to_node from kthread_create_on_cpu params.
*Updated the macro description comment.
v2->v3:
*Convert this helper macro to static inline function
*Fix typo in changelog
*Update changelog
v1 link:
https://lore.kernel.org/lkml/20211021120135.3003-2-caihuoqing@baidu.com/
v2 link:
https://lore.kernel.org/lkml/20211021122758.3092-2-caihuoqing@baidu.com/
Cai Huoqing (6):
kthread: Add the helper function kthread_run_on_cpu()
RDMA/siw: Make use of the helper function kthread_run_on_cpu()
ring-buffer: Make use of the helper function kthread_run_on_cpu()
rcutorture: Make use of the helper function kthread_run_on_cpu()
trace/osnoise: Make use of the helper function kthread_run_on_cpu()
trace/hwlat: Make use of the helper function kthread_run_on_cpu()
drivers/infiniband/sw/siw/siw_main.c | 7 +++----
include/linux/kthread.h | 25 +++++++++++++++++++++++++
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, 34 insertions(+), 21 deletions(-)
--
2.25.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
2021-10-26 8:32 ` Cai,Huoqing
2021-10-22 2:57 ` [PATCH v3 2/6] RDMA/siw: Make use of " Cai Huoqing
` (4 subsequent siblings)
5 siblings, 1 reply; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
the helper function kthread_run_on_cpu() 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>
---
v1->v2:
*Remove cpu_to_node from kthread_create_on_cpu params.
*Updated the macro description comment.
v2->v3:
*Convert this helper macro to static inline function
*Fix typo in changelog
v1 link:
https://lore.kernel.org/lkml/20211021120135.3003-2-caihuoqing@baidu.com/
v2 link:
https://lore.kernel.org/lkml/20211021122758.3092-2-caihuoqing@baidu.com/
include/linux/kthread.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 346b0f269161..db47aae7c481 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -56,6 +56,31 @@ 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_cpu()
+ * followed by wake_up_process(). Returns the kthread or
+ * ERR_PTR(-ENOMEM).
+ */
+static inline struct task_struct *
+kthread_run_on_cpu(int (*threadfn)(void *data), void *data,
+ unsigned int cpu, const char *namefmt)
+{
+ struct task_struct *p;
+
+ p = kthread_create_on_cpu(threadfn, data, cpu, namefmt);
+ if (!IS_ERR(p))
+ wake_up_process(p);
+
+ return p;
+}
+
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);
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 2/6] RDMA/siw: Make use of the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 1/6] " Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 3/6] ring-buffer: " Cai Huoqing
` (3 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Replace kthread_create/kthread_bind/wake_up_process()
with kthread_run_on_cpu() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
drivers/infiniband/sw/siw/siw_main.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/sw/siw/siw_main.c b/drivers/infiniband/sw/siw/siw_main.c
index 9093e6a80b26..e5c586913d0b 100644
--- a/drivers/infiniband/sw/siw/siw_main.c
+++ b/drivers/infiniband/sw/siw/siw_main.c
@@ -98,15 +98,14 @@ static int siw_create_tx_threads(void)
continue;
siw_tx_thread[cpu] =
- kthread_create(siw_run_sq, (unsigned long *)(long)cpu,
- "siw_tx/%d", cpu);
+ kthread_run_on_cpu(siw_run_sq,
+ (unsigned long *)(long)cpu,
+ cpu, "siw_tx/%u");
if (IS_ERR(siw_tx_thread[cpu])) {
siw_tx_thread[cpu] = NULL;
continue;
}
- kthread_bind(siw_tx_thread[cpu], cpu);
- wake_up_process(siw_tx_thread[cpu]);
assigned++;
}
return assigned;
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 3/6] ring-buffer: Make use of the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 1/6] " Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 2/6] RDMA/siw: Make use of " Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 4/6] rcutorture: " Cai Huoqing
` (2 subsequent siblings)
5 siblings, 0 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Replace kthread_create/kthread_bind/wake_up_process()
with kthread_run_on_cpu() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
kernel/trace/ring_buffer.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index c5a3fbf19617..afb306e21e5b 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -5898,16 +5898,13 @@ static __init int test_ringbuffer(void)
rb_data[cpu].buffer = buffer;
rb_data[cpu].cpu = cpu;
rb_data[cpu].cnt = cpu;
- rb_threads[cpu] = kthread_create(rb_test, &rb_data[cpu],
- "rbtester/%d", cpu);
+ rb_threads[cpu] = kthread_run_on_cpu(rb_test, &rb_data[cpu],
+ cpu, "rbtester/%u");
if (WARN_ON(IS_ERR(rb_threads[cpu]))) {
pr_cont("FAILED\n");
ret = PTR_ERR(rb_threads[cpu]);
goto out_free;
}
-
- kthread_bind(rb_threads[cpu], cpu);
- wake_up_process(rb_threads[cpu]);
}
/* Now create the rb hammer! */
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 4/6] rcutorture: Make use of the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
` (2 preceding siblings ...)
2021-10-22 2:57 ` [PATCH v3 3/6] ring-buffer: " Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 5/6] trace/osnoise: " Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 6/6] trace/hwlat: " Cai Huoqing
5 siblings, 0 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Replace kthread_create_on_node/kthread_bind/wake_up_process()
with kthread_run_on_cpu() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
kernel/rcu/rcutorture.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c
index 503e14e62e8f..6c3ba8c0d7ff 100644
--- a/kernel/rcu/rcutorture.c
+++ b/kernel/rcu/rcutorture.c
@@ -2025,9 +2025,8 @@ static int rcutorture_booster_init(unsigned int cpu)
mutex_lock(&boost_mutex);
rcu_torture_disable_rt_throttle();
VERBOSE_TOROUT_STRING("Creating rcu_torture_boost task");
- boost_tasks[cpu] = kthread_create_on_node(rcu_torture_boost, NULL,
- cpu_to_node(cpu),
- "rcu_torture_boost");
+ boost_tasks[cpu] = kthread_run_on_cpu(rcu_torture_boost, NULL,
+ cpu, "rcu_torture_boost_%u");
if (IS_ERR(boost_tasks[cpu])) {
retval = PTR_ERR(boost_tasks[cpu]);
VERBOSE_TOROUT_STRING("rcu_torture_boost task create failed");
@@ -2036,8 +2035,6 @@ static int rcutorture_booster_init(unsigned int cpu)
mutex_unlock(&boost_mutex);
return retval;
}
- kthread_bind(boost_tasks[cpu], cpu);
- wake_up_process(boost_tasks[cpu]);
mutex_unlock(&boost_mutex);
return 0;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 5/6] trace/osnoise: Make use of the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
` (3 preceding siblings ...)
2021-10-22 2:57 ` [PATCH v3 4/6] rcutorture: " Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 6/6] trace/hwlat: " Cai Huoqing
5 siblings, 0 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Replace kthread_create_on_cpu/wake_up_process()
with kthread_run_on_cpu() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
kernel/trace/trace_osnoise.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index ce053619f289..cbd78fd5e491 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -1525,7 +1525,7 @@ static int start_kthread(unsigned int cpu)
#else
snprintf(comm, 24, "osnoise/%d", cpu);
#endif
- kthread = kthread_create_on_cpu(main, NULL, cpu, comm);
+ kthread = kthread_run_on_cpu(main, NULL, cpu, comm);
if (IS_ERR(kthread)) {
pr_err(BANNER "could not start sampling thread\n");
@@ -1534,7 +1534,6 @@ static int start_kthread(unsigned int cpu)
}
per_cpu(per_cpu_osnoise_var, cpu).kthread = kthread;
- wake_up_process(kthread);
return 0;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* [PATCH v3 6/6] trace/hwlat: Make use of the helper function kthread_run_on_cpu()
2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
` (4 preceding siblings ...)
2021-10-22 2:57 ` [PATCH v3 5/6] trace/osnoise: " Cai Huoqing
@ 2021-10-22 2:57 ` Cai Huoqing
5 siblings, 0 replies; 9+ messages in thread
From: Cai Huoqing @ 2021-10-22 2:57 UTC (permalink / raw)
To: rostedt
Cc: Cai Huoqing, Bernard Metzler, Doug Ledford, Jason Gunthorpe,
Davidlohr Bueso, Paul E. McKenney, Josh Triplett,
Mathieu Desnoyers, Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Replace kthread_create_on_cpu/wake_up_process()
with kthread_run_on_cpu() to simplify the code.
Signed-off-by: Cai Huoqing <caihuoqing@baidu.com>
---
kernel/trace/trace_hwlat.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c
index 1b83d75eb103..0e555335f095 100644
--- a/kernel/trace/trace_hwlat.c
+++ b/kernel/trace/trace_hwlat.c
@@ -491,18 +491,14 @@ static void stop_per_cpu_kthreads(void)
static int start_cpu_kthread(unsigned int cpu)
{
struct task_struct *kthread;
- char comm[24];
- snprintf(comm, 24, "hwlatd/%d", cpu);
-
- kthread = kthread_create_on_cpu(kthread_fn, NULL, cpu, comm);
+ kthread = kthread_run_on_cpu(kthread_fn, NULL, cpu, "hwlatd/%u");
if (IS_ERR(kthread)) {
pr_err(BANNER "could not start sampling thread\n");
return -ENOMEM;
}
per_cpu(hwlat_per_cpu_data, cpu).kthread = kthread;
- wake_up_process(kthread);
return 0;
}
--
2.25.1
^ permalink raw reply related [flat|nested] 9+ messages in thread
* RE: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
2021-10-22 2:57 ` [PATCH v3 1/6] " Cai Huoqing
@ 2021-10-26 8:32 ` Cai,Huoqing
2021-11-16 21:01 ` Steven Rostedt
0 siblings, 1 reply; 9+ messages in thread
From: Cai,Huoqing @ 2021-10-26 8:32 UTC (permalink / raw)
To: rostedt
Cc: Bernard Metzler, Doug Ledford, Jason Gunthorpe, Davidlohr Bueso,
Paul E. McKenney, Josh Triplett, Mathieu Desnoyers,
Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu
Hello,
Just a ping, to see if there are any more comments :-P
> -----Original Message-----
> From: Cai,Huoqing <caihuoqing@baidu.com>
> Sent: 2021年10月22日 10:57
> Subject: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
>
> the helper function kthread_run_on_cpu() 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>
> ---
> v1->v2:
> *Remove cpu_to_node from kthread_create_on_cpu params.
> *Updated the macro description comment.
> v2->v3:
> *Convert this helper macro to static inline function
> *Fix typo in changelog
>
> v1 link:
> https://lore.kernel.org/lkml/20211021120135.3003-2-
> caihuoqing@baidu.com/
> v2 link:
> https://lore.kernel.org/lkml/20211021122758.3092-2-
> caihuoqing@baidu.com/
>
> include/linux/kthread.h | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/include/linux/kthread.h b/include/linux/kthread.h
> index 346b0f269161..db47aae7c481 100644
> --- a/include/linux/kthread.h
> +++ b/include/linux/kthread.h
> @@ -56,6 +56,31 @@ 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_cpu()
> + * followed by wake_up_process(). Returns the kthread or
> + * ERR_PTR(-ENOMEM).
> + */
> +static inline struct task_struct *
> +kthread_run_on_cpu(int (*threadfn)(void *data), void *data,
> + unsigned int cpu, const char *namefmt)
> +{
> + struct task_struct *p;
> +
> + p = kthread_create_on_cpu(threadfn, data, cpu, namefmt);
> + if (!IS_ERR(p))
> + wake_up_process(p);
> +
> + return p;
> +}
> +
> 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);
> --
> 2.25.1
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
2021-10-26 8:32 ` Cai,Huoqing
@ 2021-11-16 21:01 ` Steven Rostedt
0 siblings, 0 replies; 9+ messages in thread
From: Steven Rostedt @ 2021-11-16 21:01 UTC (permalink / raw)
To: Cai,Huoqing
Cc: Bernard Metzler, Doug Ledford, Jason Gunthorpe, Davidlohr Bueso,
Paul E. McKenney, Josh Triplett, Mathieu Desnoyers,
Lai Jiangshan, Joel Fernandes, Ingo Molnar,
Daniel Bristot de Oliveira, linux-rdma, linux-kernel, rcu,
Andrew Morton
On Tue, 26 Oct 2021 08:32:30 +0000
"Cai,Huoqing" <caihuoqing@baidu.com> wrote:
> Hello,
> Just a ping, to see if there are any more comments :-P
I have no real issue with this patch set. As it seems to be a generic clean
up, perhaps Andrew might like to take a look at it, and if he's fine with
it, he can take it through his tree?
-- Steve
> > -----Original Message-----
> > From: Cai,Huoqing <caihuoqing@baidu.com>
> > Sent: 2021年10月22日 10:57
> > Subject: [PATCH v3 1/6] kthread: Add the helper function kthread_run_on_cpu()
> >
> > the helper function kthread_run_on_cpu() 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>
> > ---
> > v1->v2:
> > *Remove cpu_to_node from kthread_create_on_cpu params.
> > *Updated the macro description comment.
> > v2->v3:
> > *Convert this helper macro to static inline function
> > *Fix typo in changelog
> >
> > v1 link:
> > https://lore.kernel.org/lkml/20211021120135.3003-2-
> > caihuoqing@baidu.com/
> > v2 link:
> > https://lore.kernel.org/lkml/20211021122758.3092-2-
> > caihuoqing@baidu.com/
> >
> > include/linux/kthread.h | 25 +++++++++++++++++++++++++
> > 1 file changed, 25 insertions(+)
> >
> > diff --git a/include/linux/kthread.h b/include/linux/kthread.h
> > index 346b0f269161..db47aae7c481 100644
> > --- a/include/linux/kthread.h
> > +++ b/include/linux/kthread.h
> > @@ -56,6 +56,31 @@ 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_cpu()
> > + * followed by wake_up_process(). Returns the kthread or
> > + * ERR_PTR(-ENOMEM).
> > + */
> > +static inline struct task_struct *
> > +kthread_run_on_cpu(int (*threadfn)(void *data), void *data,
> > + unsigned int cpu, const char *namefmt)
> > +{
> > + struct task_struct *p;
> > +
> > + p = kthread_create_on_cpu(threadfn, data, cpu, namefmt);
> > + if (!IS_ERR(p))
> > + wake_up_process(p);
> > +
> > + return p;
> > +}
> > +
> > 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);
> > --
> > 2.25.1
>
^ permalink raw reply [flat|nested] 9+ messages in thread
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2021-10-22 2:57 [PATCH v3 0/6] kthread: Add the helper function kthread_run_on_cpu() Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 1/6] " Cai Huoqing
2021-10-26 8:32 ` Cai,Huoqing
2021-11-16 21:01 ` Steven Rostedt
2021-10-22 2:57 ` [PATCH v3 2/6] RDMA/siw: Make use of " Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 3/6] ring-buffer: " Cai Huoqing
2021-10-22 2:57 ` [PATCH v3 4/6] rcutorture: " Cai Huoqing
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