kthread: better support freezable kthread workers

This patch allows to make kthread worker freezable via a new @flags
parameter. It will allow to avoid an init work in some kthreads.

It currently does not affect the function of kthread_worker_fn()
but it might help to do some optimization or fixes eventually.

I currently do not know about any other use for the @flags
parameter but I believe that we will want more flags
in the future.

Finally, I hope that it will not cause confusion with @flags member
in struct kthread. Well, I guess that we will want to rework the
basic kthreads implementation once all kthreads are converted into
kthread workers or workqueues. It is possible that we will merge
the two structures.

Link: http://lkml.kernel.org/r/1470754545-17632-12-git-send-email-pmladek@suse.com
Signed-off-by: Petr Mladek <pmladek@suse.com>
Acked-by: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Borislav Petkov <bp@suse.de>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 5c2ec2c4eb2252cbf9b31d6b7f34c2f3c12a3b74..4f5235cb13bb71b4aeba74a492429d174179de20 100644 (file)
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -65,7 +65,12 @@ struct kthread_work;
 typedef void (*kthread_work_func_t)(struct kthread_work *work);
 void kthread_delayed_work_timer_fn(unsigned long __data);
 
+enum {
+       KTW_FREEZABLE           = 1 << 0,       /* freeze during suspend */
+};
+
 struct kthread_worker {
+       unsigned int            flags;
        spinlock_t              lock;
        struct list_head        work_list;
        struct list_head        delayed_work_list;
@@ -154,12 +159,13 @@ extern void __kthread_init_worker(struct kthread_worker *worker,
 
 int kthread_worker_fn(void *worker_ptr);
 
-__printf(1, 2)
+__printf(2, 3)
 struct kthread_worker *
-kthread_create_worker(const char namefmt[], ...);
+kthread_create_worker(unsigned int flags, const char namefmt[], ...);
 
 struct kthread_worker *
-kthread_create_worker_on_cpu(int cpu, const char namefmt[], ...);
+kthread_create_worker_on_cpu(int cpu, unsigned int flags,
+                            const char namefmt[], ...);
 
 bool kthread_queue_work(struct kthread_worker *worker,
                        struct kthread_work *work);

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 0de621e1c73206db56d376ad540c53a299ebd181..9443ddc1b96755b8c89b90b58efaa85a1b792b14 100644 (file)
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -556,11 +556,11 @@ void __kthread_init_worker(struct kthread_worker *worker,
                                const char *name,
                                struct lock_class_key *key)
 {
+       memset(worker, 0, sizeof(struct kthread_worker));
        spin_lock_init(&worker->lock);
        lockdep_set_class_and_name(&worker->lock, key, name);
        INIT_LIST_HEAD(&worker->work_list);
        INIT_LIST_HEAD(&worker->delayed_work_list);
-       worker->task = NULL;
 }
 EXPORT_SYMBOL_GPL(__kthread_init_worker);
 
@@ -590,6 +590,10 @@ int kthread_worker_fn(void *worker_ptr)
         */
        WARN_ON(worker->task && worker->task != current);
        worker->task = current;
+
+       if (worker->flags & KTW_FREEZABLE)
+               set_freezable();
+
 repeat:
        set_current_state(TASK_INTERRUPTIBLE);  /* mb paired w/ kthread_stop */
 
@@ -623,7 +627,8 @@ repeat:
 EXPORT_SYMBOL_GPL(kthread_worker_fn);
 
 static struct kthread_worker *
-__kthread_create_worker(int cpu, const char namefmt[], va_list args)
+__kthread_create_worker(int cpu, unsigned int flags,
+                       const char namefmt[], va_list args)
 {
        struct kthread_worker *worker;
        struct task_struct *task;
@@ -653,6 +658,7 @@ __kthread_create_worker(int cpu, const char namefmt[], va_list args)
        if (IS_ERR(task))
                goto fail_task;
 
+       worker->flags = flags;
        worker->task = task;
        wake_up_process(task);
        return worker;
@@ -664,6 +670,7 @@ fail_task:
 
 /**
  * kthread_create_worker - create a kthread worker
+ * @flags: flags modifying the default behavior of the worker
  * @namefmt: printf-style name for the kthread worker (task).
  *
  * Returns a pointer to the allocated worker on success, ERR_PTR(-ENOMEM)
@@ -671,13 +678,13 @@ fail_task:
  * when the worker was SIGKILLed.
  */
 struct kthread_worker *
-kthread_create_worker(const char namefmt[], ...)
+kthread_create_worker(unsigned int flags, const char namefmt[], ...)
 {
        struct kthread_worker *worker;
        va_list args;
 
        va_start(args, namefmt);
-       worker = __kthread_create_worker(-1, namefmt, args);
+       worker = __kthread_create_worker(-1, flags, namefmt, args);
        va_end(args);
 
        return worker;
@@ -688,6 +695,7 @@ EXPORT_SYMBOL(kthread_create_worker);
  * kthread_create_worker_on_cpu - create a kthread worker and bind it
  *     it to a given CPU and the associated NUMA node.
  * @cpu: CPU number
+ * @flags: flags modifying the default behavior of the worker
  * @namefmt: printf-style name for the kthread worker (task).
  *
  * Use a valid CPU number if you want to bind the kthread worker
@@ -701,13 +709,14 @@ EXPORT_SYMBOL(kthread_create_worker);
  * when the worker was SIGKILLed.
  */
 struct kthread_worker *
-kthread_create_worker_on_cpu(int cpu, const char namefmt[], ...)
+kthread_create_worker_on_cpu(int cpu, unsigned int flags,
+                            const char namefmt[], ...)
 {
        struct kthread_worker *worker;
        va_list args;
 
        va_start(args, namefmt);
-       worker = __kthread_create_worker(cpu, namefmt, args);
+       worker = __kthread_create_worker(cpu, flags, namefmt, args);
        va_end(args);
 
        return worker;