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[PATCH] Support for freezeable workqueues

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Make it possible to create a workqueue the worker thread of which will be
frozen during suspend, along with other kernel threads.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Cc: Nigel Cunningham <nigel@suspend2.net>
Cc: David Chinner <dgc@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki 2006-12-06 20:34:49 -08:00 • committed by Linus Torvalds
parent 5045cfc103
commit 341a595850
2 changed files with 19 additions and 9 deletions
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8
include/linux/workqueue.h
View file

@ -147,9 +147,11 @@ struct execute_work {
extern struct workqueue_struct *__create_workqueue(const char *name, extern struct workqueue_struct *__create_workqueue(const char *name,
int singlethread); int singlethread,
#define create_workqueue(name) __create_workqueue((name), 0) int freezeable);
#define create_singlethread_workqueue(name) __create_workqueue((name), 1) #define create_workqueue(name) __create_workqueue((name), 0, 0)
#define create_freezeable_workqueue(name) __create_workqueue((name), 0, 1)
#define create_singlethread_workqueue(name) __create_workqueue((name), 1, 0)
extern void destroy_workqueue(struct workqueue_struct *wq); extern void destroy_workqueue(struct workqueue_struct *wq);

20
kernel/workqueue.c
View file

@ -29,6 +29,7 @@
#include <linux/kthread.h> #include <linux/kthread.h>
#include <linux/hardirq.h> #include <linux/hardirq.h>
#include <linux/mempolicy.h> #include <linux/mempolicy.h>
#include <linux/freezer.h>
/* /*
* The per-CPU workqueue (if single thread, we always use the first * The per-CPU workqueue (if single thread, we always use the first
@ -55,6 +56,8 @@ struct cpu_workqueue_struct {
struct task_struct *thread; struct task_struct *thread;
int run_depth; /* Detect run_workqueue() recursion depth */ int run_depth; /* Detect run_workqueue() recursion depth */
int freezeable; /* Freeze the thread during suspend */
} ____cacheline_aligned; } ____cacheline_aligned;
/* /*
@ -265,7 +268,8 @@ static int worker_thread(void *__cwq)
struct k_sigaction sa; struct k_sigaction sa;
sigset_t blocked; sigset_t blocked;
current->flags |= PF_NOFREEZE; if (!cwq->freezeable)
current->flags |= PF_NOFREEZE;
set_user_nice(current, -5); set_user_nice(current, -5);
@ -288,6 +292,9 @@ static int worker_thread(void *__cwq)
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);
while (!kthread_should_stop()) { while (!kthread_should_stop()) {
if (cwq->freezeable)
try_to_freeze();
add_wait_queue(&cwq->more_work, &wait); add_wait_queue(&cwq->more_work, &wait);
if (list_empty(&cwq->worklist)) if (list_empty(&cwq->worklist))
schedule(); schedule();
@ -364,7 +371,7 @@ void fastcall flush_workqueue(struct workqueue_struct *wq)
EXPORT_SYMBOL_GPL(flush_workqueue); EXPORT_SYMBOL_GPL(flush_workqueue);
static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq, static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
int cpu) int cpu, int freezeable)
{ {
struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu); struct cpu_workqueue_struct *cwq = per_cpu_ptr(wq->cpu_wq, cpu);
struct task_struct *p; struct task_struct *p;
@ -374,6 +381,7 @@ static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
cwq->thread = NULL; cwq->thread = NULL;
cwq->insert_sequence = 0; cwq->insert_sequence = 0;
cwq->remove_sequence = 0; cwq->remove_sequence = 0;
cwq->freezeable = freezeable;
INIT_LIST_HEAD(&cwq->worklist); INIT_LIST_HEAD(&cwq->worklist);
init_waitqueue_head(&cwq->more_work); init_waitqueue_head(&cwq->more_work);
init_waitqueue_head(&cwq->work_done); init_waitqueue_head(&cwq->work_done);
@ -389,7 +397,7 @@ static struct task_struct *create_workqueue_thread(struct workqueue_struct *wq,
} }
struct workqueue_struct *__create_workqueue(const char *name, struct workqueue_struct *__create_workqueue(const char *name,
int singlethread) int singlethread, int freezeable)
{ {
int cpu, destroy = 0; int cpu, destroy = 0;
struct workqueue_struct *wq; struct workqueue_struct *wq;
@ -409,7 +417,7 @@ struct workqueue_struct *__create_workqueue(const char *name,
mutex_lock(&workqueue_mutex); mutex_lock(&workqueue_mutex);
if (singlethread) { if (singlethread) {
INIT_LIST_HEAD(&wq->list); INIT_LIST_HEAD(&wq->list);
p = create_workqueue_thread(wq, singlethread_cpu); p = create_workqueue_thread(wq, singlethread_cpu, freezeable);
if (!p) if (!p)
destroy = 1; destroy = 1;
else else
@ -417,7 +425,7 @@ struct workqueue_struct *__create_workqueue(const char *name,
} else { } else {
list_add(&wq->list, &workqueues); list_add(&wq->list, &workqueues);
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
p = create_workqueue_thread(wq, cpu); p = create_workqueue_thread(wq, cpu, freezeable);
if (p) { if (p) {
kthread_bind(p, cpu); kthread_bind(p, cpu);
wake_up_process(p); wake_up_process(p);
@ -667,7 +675,7 @@ static int __devinit workqueue_cpu_callback(struct notifier_block *nfb,
mutex_lock(&workqueue_mutex); mutex_lock(&workqueue_mutex);
/* Create a new workqueue thread for it. */ /* Create a new workqueue thread for it. */
list_for_each_entry(wq, &workqueues, list) { list_for_each_entry(wq, &workqueues, list) {
if (!create_workqueue_thread(wq, hotcpu)) { if (!create_workqueue_thread(wq, hotcpu, 0)) {
printk("workqueue for %i failed\n", hotcpu); printk("workqueue for %i failed\n", hotcpu);
return NOTIFY_BAD; return NOTIFY_BAD;
} }