mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 11:37:47 +07:00
c00166d87e
1. Change smpboot_unpark_thread() to check ->selfparking, just
like smpboot_park_thread() does.
2. Introduce stop_machine_unpark() which sets ->enabled and calls
kthread_unpark().
3. Change smpboot_thread_call() and cpu_stop_init() to call
stop_machine_unpark() by hand.
This way:
- IMO the ->selfparking logic becomes more consistent.
- We can kill the smp_hotplug_thread->pre_unpark() method.
- We can easily unpark the stopper thread earlier. Say, we
can move stop_machine_unpark() from smpboot_thread_call()
to sched_cpu_active() as Peter suggests.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: heiko.carstens@de.ibm.com
Link: http://lkml.kernel.org/r/20151009160049.GA10166@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
62 lines
2.1 KiB
C
62 lines
2.1 KiB
C
#ifndef _LINUX_SMPBOOT_H
|
|
#define _LINUX_SMPBOOT_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
struct task_struct;
|
|
/* Cookie handed to the thread_fn*/
|
|
struct smpboot_thread_data;
|
|
|
|
/**
|
|
* struct smp_hotplug_thread - CPU hotplug related thread descriptor
|
|
* @store: Pointer to per cpu storage for the task pointers
|
|
* @list: List head for core management
|
|
* @thread_should_run: Check whether the thread should run or not. Called with
|
|
* preemption disabled.
|
|
* @thread_fn: The associated thread function
|
|
* @create: Optional setup function, called when the thread gets
|
|
* created (Not called from the thread context)
|
|
* @setup: Optional setup function, called when the thread gets
|
|
* operational the first time
|
|
* @cleanup: Optional cleanup function, called when the thread
|
|
* should stop (module exit)
|
|
* @park: Optional park function, called when the thread is
|
|
* parked (cpu offline)
|
|
* @unpark: Optional unpark function, called when the thread is
|
|
* unparked (cpu online)
|
|
* @cpumask: Internal state. To update which threads are unparked,
|
|
* call smpboot_update_cpumask_percpu_thread().
|
|
* @selfparking: Thread is not parked by the park function.
|
|
* @thread_comm: The base name of the thread
|
|
*/
|
|
struct smp_hotplug_thread {
|
|
struct task_struct __percpu **store;
|
|
struct list_head list;
|
|
int (*thread_should_run)(unsigned int cpu);
|
|
void (*thread_fn)(unsigned int cpu);
|
|
void (*create)(unsigned int cpu);
|
|
void (*setup)(unsigned int cpu);
|
|
void (*cleanup)(unsigned int cpu, bool online);
|
|
void (*park)(unsigned int cpu);
|
|
void (*unpark)(unsigned int cpu);
|
|
cpumask_var_t cpumask;
|
|
bool selfparking;
|
|
const char *thread_comm;
|
|
};
|
|
|
|
int smpboot_register_percpu_thread_cpumask(struct smp_hotplug_thread *plug_thread,
|
|
const struct cpumask *cpumask);
|
|
|
|
static inline int
|
|
smpboot_register_percpu_thread(struct smp_hotplug_thread *plug_thread)
|
|
{
|
|
return smpboot_register_percpu_thread_cpumask(plug_thread,
|
|
cpu_possible_mask);
|
|
}
|
|
|
|
void smpboot_unregister_percpu_thread(struct smp_hotplug_thread *plug_thread);
|
|
int smpboot_update_cpumask_percpu_thread(struct smp_hotplug_thread *plug_thread,
|
|
const struct cpumask *);
|
|
|
|
#endif
|