The patch titled
Subject: kthread: better support freezable kthread workers
has been removed from the -mm tree. Its filename was
kthread-better-support-freezable-kthread-workers.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Petr Mladek <pmladek@xxxxxxxx>
Subject: 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@xxxxxxxx
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Acked-by: Tejun Heo <tj@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>
Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Jiri Kosina <jkosina@xxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kthread.h | 12 +++++++++---
kernel/kthread.c | 21 +++++++++++++++------
2 files changed, 24 insertions(+), 9 deletions(-)
diff -puN include/linux/kthread.h~kthread-better-support-freezable-kthread-workers include/linux/kthread.h
--- a/include/linux/kthread.h~kthread-better-support-freezable-kthread-workers
+++ a/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
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 -puN kernel/kthread.c~kthread-better-support-freezable-kthread-workers kernel/kthread.c
--- a/kernel/kthread.c~kthread-better-support-freezable-kthread-workers
+++ a/kernel/kthread.c
@@ -560,11 +560,11 @@ void __kthread_init_worker(struct kthrea
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);
@@ -594,6 +594,10 @@ 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 */
@@ -627,7 +631,8 @@ 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;
@@ -657,6 +662,7 @@ __kthread_create_worker(int cpu, const c
if (IS_ERR(task))
goto fail_task;
+ worker->flags = flags;
worker->task = task;
wake_up_process(task);
return worker;
@@ -668,6 +674,7 @@ 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)
@@ -675,13 +682,13 @@ 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;
@@ -692,6 +699,7 @@ 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
@@ -705,13 +713,14 @@ 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;
_
Patches currently in -mm which might be from pmladek@xxxxxxxx are
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