コード例 #1
0
/**
 * freeze_task - send a freeze request to given task
 * @p: task to send the request to
 *
 * If @p is freezing, the freeze request is sent either by sending a fake
 * signal (if it's not a kernel thread) or waking it up (if it's a kernel
 * thread).
 *
 * RETURNS:
 * %false, if @p is not freezing or already frozen; %true, otherwise
 */
bool freeze_task(struct task_struct *p)
{
	unsigned long flags;

	/*
	 * This check can race with freezer_do_not_count, but worst case that
	 * will result in an extra wakeup being sent to the task.  It does not
	 * race with freezer_count(), the barriers in freezer_count() and
	 * freezer_should_skip() ensure that either freezer_count() sees
	 * freezing == true in try_to_freeze() and freezes, or
	 * freezer_should_skip() sees !PF_FREEZE_SKIP and freezes the task
	 * normally.
	 */
	if (freezer_should_skip(p))
		return false;

	spin_lock_irqsave(&freezer_lock, flags);
	if (!freezing(p) || frozen(p)) {
		spin_unlock_irqrestore(&freezer_lock, flags);
		return false;
	}

	if (!(p->flags & PF_KTHREAD))
		fake_signal_wake_up(p);
	else
		wake_up_state(p, TASK_INTERRUPTIBLE);

	spin_unlock_irqrestore(&freezer_lock, flags);
	return true;
}
コード例 #2
0
ファイル: freezer.c プロジェクト: nos1609/Chrono_Kernel-1
/**
 * freeze_task - send a freeze request to given task
 * @p: task to send the request to
 *
 * If @p is freezing, the freeze request is sent either by sending a fake
 * signal (if it's not a kernel thread) or waking it up (if it's a kernel
 * thread).
 *
 * RETURNS:
 * %false, if @p is not freezing or already frozen; %true, otherwise
 */
bool freeze_task(struct task_struct *p)
{
	unsigned long flags;

	/*
	 * This check can race with freezer_do_not_count, but worst case that
	 * will result in an extra wakeup being sent to the task.  It does not
	 * race with freezer_count(), the barriers in freezer_count() and
	 * freezer_should_skip() ensure that either freezer_count() sees
	 * freezing == true in try_to_freeze() and freezes, or
	 * freezer_should_skip() sees !PF_FREEZE_SKIP and freezes the task
	 * normally.
	 */
	if (freezer_should_skip(p))
		return false;

	spin_lock_irqsave(&freezer_lock, flags);
	if (!freezing(p) || frozen(p)) {
		spin_unlock_irqrestore(&freezer_lock, flags);
		return false;
	}

	if (!(p->flags & PF_KTHREAD)) {
		fake_signal_wake_up(p);
		/*
		 * fake_signal_wake_up() goes through p's scheduler
		 * lock and guarantees that TASK_STOPPED/TRACED ->
		 * TASK_RUNNING transition can't race with task state
		 * testing in try_to_freeze_tasks().
		 */
	} else {
		wake_up_state(p, TASK_INTERRUPTIBLE);
	}

	spin_unlock_irqrestore(&freezer_lock, flags);
	return true;
}
コード例 #3
0
static int try_to_freeze_tasks(bool sig_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	unsigned int wakeup = 0;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;
	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (frozen(p) || !freezeable(p))
				continue;

			if (!freeze_task(p, sig_only))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (!todo || time_after(jiffies, end_time))
			break;

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		msleep(10);
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					sig_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
			printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
					"(%d tasks refusing to freeze):\n",
					elapsed_csecs / 100, elapsed_csecs % 100, todo);
		}
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			task_lock(p);
			if (freezing(p) && !freezer_should_skip(p) &&
				elapsed_csecs > 100)
				sched_show_task(p);
			cancel_freezing(p);
			task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
コード例 #4
0
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			/*
                                                
                                                    
                                                   
                                                 
     
                                                                 
                                                         
                                                         
    */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
                                                             
                                    
   */
		msleep(10);
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/*                                                         
                                                               
                                                               
                                                  
   */
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					user_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
			printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
			       wakeup ? "aborted" : "failed",
			       elapsed_csecs / 100, elapsed_csecs % 100,
			       todo - wq_busy, wq_busy);
		}

		if (!wakeup) {
			read_lock(&tasklist_lock);
			do_each_thread(g, p) {
				if (p != current && !freezer_should_skip(p)
				    && freezing(p) && !frozen(p) &&
				    elapsed_csecs > 100)
					sched_show_task(p);
			} while_each_thread(g, p);
			read_unlock(&tasklist_lock);
		}
	} else {
コード例 #5
0
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's scheduler lock, it's
			 * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
			 * transition can't race with task state testing here.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		msleep(10);
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					user_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
			printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
			       wakeup ? "aborted" : "failed",
			       elapsed_csecs / 100, elapsed_csecs % 100,
			       todo - wq_busy, wq_busy);
		}

		if (!wakeup) {
			read_lock(&tasklist_lock);
			do_each_thread(g, p) {
				if (p != current && !freezer_should_skip(p)
				    && freezing(p) && !frozen(p) &&
				    elapsed_csecs > 100)
					sched_show_task(p);
			} while_each_thread(g, p);
			read_unlock(&tasklist_lock);
		}
	} else {
コード例 #6
0
ファイル: process.c プロジェクト: AICP/kernel_moto_shamu
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_msecs64;
	unsigned int elapsed_msecs;
	bool wakeup = false;
	int sleep_usecs = USEC_PER_MSEC;
	char suspend_abort[MAX_SUSPEND_ABORT_LEN];

	do_gettimeofday(&start);

	end_time = jiffies + msecs_to_jiffies(freeze_timeout_msecs);

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			if (!freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
#ifndef CONFIG_UML
			pm_get_active_wakeup_sources(suspend_abort,
				MAX_SUSPEND_ABORT_LEN);
#endif
			log_suspend_abort_reason(suspend_abort);
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the refrigerator.  Start with an initial
		 * 1 ms sleep followed by exponential backoff until 8 ms.
		 */
		usleep_range(sleep_usecs / 2, sleep_usecs);
		if (sleep_usecs < 8 * USEC_PER_MSEC)
			sleep_usecs *= 2;
	}

	do_gettimeofday(&end);
	elapsed_msecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_msecs64, NSEC_PER_MSEC);
	elapsed_msecs = elapsed_msecs64;

	if (wakeup) {
		printk("\n");
		printk(KERN_ERR "Freezing of tasks aborted after %d.%03d seconds",
		       elapsed_msecs / 1000, elapsed_msecs % 1000);
	} else if (todo) {
		printk("\n");
		printk(KERN_ERR "Freezing of tasks failed after %d.%03d seconds"
		       " (%d tasks refusing to freeze, wq_busy=%d):\n",
		       elapsed_msecs / 1000, elapsed_msecs % 1000,
		       todo - wq_busy, wq_busy);

		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p != current && !freezer_should_skip(p)
			    && freezing(p) && !frozen(p))
				sched_show_task(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
コード例 #7
0
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p, *q;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			cpu_relax();
			if (p == current || !freeze_task(p))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's scheduler lock, it's
			 * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
			 * transition can't race with task state testing here.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p)) {
				todo++;
				q = p;
			}
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		msleep(10);
	}
コード例 #8
0
ファイル: process.c プロジェクト: Jazz-823/kernel_ayame
static int try_to_freeze_tasks(bool sig_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	unsigned int wakeup = 0;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;
	do {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (frozen(p) || !freezeable(p))
				continue;

			if (!freeze_task(p, sig_only))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's
			 * scheduler lock after setting TIF_FREEZE, it's
			 * guaranteed that either we see TASK_RUNNING or
			 * try_to_stop() after schedule() in ptrace/signal
			 * stop sees TIF_FREEZE.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
		yield();			/* Yield is okay here */
		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (time_after(jiffies, end_time))
			break;
	} while (todo);

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		printk("\n");
		printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
				"(%d tasks refusing to freeze):\n",
				wakeup ? "aborted" : "failed",
				elapsed_csecs / 100, elapsed_csecs % 100, todo);
		if(!wakeup)
			show_state();
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			task_lock(p);
			if (freezing(p) && !freezer_should_skip(p) &&
							elapsed_csecs > 100)
				printk(KERN_ERR " %s\n", p->comm);
			cancel_freezing(p);
			task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
コード例 #9
0
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_msecs64;
	unsigned int elapsed_msecs;
	bool wakeup = false;
	int sleep_usecs = USEC_PER_MSEC;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		usleep_range(sleep_usecs / 2, sleep_usecs);
		if (sleep_usecs < 8 * USEC_PER_MSEC)
			sleep_usecs *= 2;
	}

	do_gettimeofday(&end);
	elapsed_msecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_msecs64, NSEC_PER_MSEC);
	elapsed_msecs = elapsed_msecs64;

	if (todo) {
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					user_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
		printk(KERN_ERR "Freezing of tasks %s after %d.%03d seconds "
			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
			       wakeup ? "aborted" : "failed",
			       elapsed_msecs / 1000, elapsed_msecs % 1000,
			       todo - wq_busy, wq_busy);
		}

		if (!wakeup) {
#ifdef CONFIG_MSM_WATCHDOG
			
			msm_watchdog_suspend(NULL);
#endif
			read_lock(&tasklist_lock);
			do_each_thread(g, p) {
				if (p != current && !freezer_should_skip(p)
				    && freezing(p) && !frozen(p) &&
				    elapsed_msecs > 1000)
					sched_show_task(p);
			} while_each_thread(g, p);
			read_unlock(&tasklist_lock);
#ifdef CONFIG_MSM_WATCHDOG
			msm_watchdog_resume(NULL);
#endif
		}
	} else {
コード例 #10
0
ファイル: process.c プロジェクト: StefanPeter/linux-2.6-guard
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's
			 * scheduler lock after setting TIF_FREEZE, it's
			 * guaranteed that either we see TASK_RUNNING or
			 * try_to_stop() after schedule() in ptrace/signal
			 * stop sees TIF_FREEZE.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
		msleep(10);
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		printk("\n");
		printk(KERN_ERR "Freezing of tasks %s after %d.%02d seconds "
		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
		       wakeup ? "aborted" : "failed",
		       elapsed_csecs / 100, elapsed_csecs % 100,
		       todo - wq_busy, wq_busy);

		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (!wakeup && !freezer_should_skip(p) &&
			    p != current && freezing(p) && !frozen(p))
				sched_show_task(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
コード例 #11
0
ファイル: process.c プロジェクト: acassis/emlinux-ssd1935
static int try_to_freeze_tasks(int freeze_user_space)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	struct timeval start, end;
	s64 elapsed_csecs64;
	unsigned int elapsed_csecs;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;
	do {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (frozen(p) || !freezeable(p))
				continue;

			if (p->state == TASK_TRACED && frozen(p->parent)) {
				cancel_freezing(p);
				continue;
			}

			if (!freeze_task(p, freeze_user_space))
				continue;

			if (!freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
		yield();			/* Yield is okay here */
		if (time_after(jiffies, end_time))
			break;
	} while (todo);

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		printk("\n");
		printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
				"(%d tasks refusing to freeze):\n",
				elapsed_csecs / 100, elapsed_csecs % 100, todo);
		show_state();
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			task_lock(p);
			if (freezing(p) && !freezer_should_skip(p))
				printk(KERN_ERR " %s\n", p->comm);
			cancel_freezing(p);
			task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {
コード例 #12
0
ファイル: process.c プロジェクト: amadews/j608_fly_4511
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
	struct task_struct *t = NULL;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_msecs64;
	unsigned int elapsed_msecs;
	bool wakeup = false;
	int sleep_usecs = USEC_PER_MSEC;

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's scheduler lock, it's
			 * guaranteed that TASK_STOPPED/TRACED -> TASK_RUNNING
			 * transition can't race with task state testing here.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p)) {
				todo++;
				t = p;
			}
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

        if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the refrigerator.  Start with an initial
		 * 1 ms sleep followed by exponential backoff until 8 ms.
		 */
		usleep_range(sleep_usecs / 2, sleep_usecs);
		if (sleep_usecs < 8 * USEC_PER_MSEC)
			sleep_usecs *= 2;
	}

	do_gettimeofday(&end);
	elapsed_msecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_msecs64, NSEC_PER_MSEC);
	elapsed_msecs = elapsed_msecs64;

	if (todo) {
		printk("\n");
		printk(KERN_ERR "Freezing of tasks %s after %d.%03d seconds "
		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
		       wakeup ? "aborted" : "failed",
		       elapsed_msecs / 1000, elapsed_msecs % 1000,
		       todo - wq_busy, wq_busy);
		
		if (!wakeup) {
			read_lock(&tasklist_lock);
			do_each_thread(g, p) {
				if (p != current && !freezer_should_skip(p)
				    && freezing(p) && !frozen(p))
					sched_show_task(p);
			} while_each_thread(g, p);
			read_unlock(&tasklist_lock);
		}
	} else {
コード例 #13
0
static int try_to_freeze_tasks(bool user_only)
{
	struct task_struct *g, *p;
#ifdef CONFIG_SEC_PM_DEBUG
	struct task_struct *q;
#endif
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_msecs64;
	unsigned int elapsed_msecs;
	bool wakeup = false;
	int sleep_usecs = USEC_PER_MSEC;

	do_gettimeofday(&start);

	end_time = jiffies + msecs_to_jiffies(freeze_timeout_msecs);

	if (!user_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (p == current || !freeze_task(p))
				continue;

			if (!freezer_should_skip(p)) {
				todo++;
#ifdef CONFIG_SEC_PM_DEBUG
				q = p;
#endif
			}
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!user_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the refrigerator.  Start with an initial
		 * 1 ms sleep followed by exponential backoff until 8 ms.
		 */
		usleep_range(sleep_usecs / 2, sleep_usecs);
		if (sleep_usecs < 8 * USEC_PER_MSEC)
			sleep_usecs *= 2;
	}

	do_gettimeofday(&end);
	elapsed_msecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_msecs64, NSEC_PER_MSEC);
	elapsed_msecs = elapsed_msecs64;

	if (todo) {
		printk("\n");
		printk(KERN_ERR "Freezing of tasks %s after %d.%03d seconds "
		       "(%d tasks refusing to freeze, wq_busy=%d):\n",
		       wakeup ? "aborted" : "failed",
		       elapsed_msecs / 1000, elapsed_msecs % 1000,
		       todo - wq_busy, wq_busy);

#ifdef CONFIG_SEC_PM_DEBUG
		if (wakeup) {
			printk(KERN_ERR "Freezing of %s aborted (%d) (%s)\n",
					user_only ? "user space " : "tasks ",
					q ? q->pid : 0, q ? q->comm : "NONE");
		}
#endif

		if (!wakeup) {
			read_lock(&tasklist_lock);
			do_each_thread(g, p) {
				if (p != current && !freezer_should_skip(p)
				    && freezing(p) && !frozen(p))
					sched_show_task(p);
			} while_each_thread(g, p);
			read_unlock(&tasklist_lock);
		}
	} else {
コード例 #14
0
static int try_to_freeze_tasks(bool sig_only)
{
	struct task_struct *g, *p;
	unsigned long end_time;
	unsigned int todo;
	bool wq_busy = false;
	struct timeval start, end;
	u64 elapsed_csecs64;
	unsigned int elapsed_csecs;
	bool wakeup = false;
#ifdef CONFIG_SHSYS_CUST
	struct timespec tu;
#endif

	do_gettimeofday(&start);

	end_time = jiffies + TIMEOUT;

	if (!sig_only)
		freeze_workqueues_begin();

	while (true) {
		todo = 0;
		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			if (frozen(p) || !freezable(p))
				continue;

			if (!freeze_task(p, sig_only))
				continue;

			/*
			 * Now that we've done set_freeze_flag, don't
			 * perturb a task in TASK_STOPPED or TASK_TRACED.
			 * It is "frozen enough".  If the task does wake
			 * up, it will immediately call try_to_freeze.
			 *
			 * Because freeze_task() goes through p's
			 * scheduler lock after setting TIF_FREEZE, it's
			 * guaranteed that either we see TASK_RUNNING or
			 * try_to_stop() after schedule() in ptrace/signal
			 * stop sees TIF_FREEZE.
			 */
			if (!task_is_stopped_or_traced(p) &&
			    !freezer_should_skip(p))
				todo++;
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);

		if (!sig_only) {
			wq_busy = freeze_workqueues_busy();
			todo += wq_busy;
		}

		if (todo && has_wake_lock(WAKE_LOCK_SUSPEND)) {
			wakeup = 1;
			break;
		}
		if (!todo || time_after(jiffies, end_time))
			break;

		if (pm_wakeup_pending()) {
			wakeup = true;
			break;
		}

		/*
		 * We need to retry, but first give the freezing tasks some
		 * time to enter the regrigerator.
		 */
#ifdef CONFIG_SHSYS_CUST
		tu.tv_sec = 0;
		tu.tv_nsec = 10000000;
		hrtimer_nanosleep(&tu, NULL, HRTIMER_MODE_REL, CLOCK_MONOTONIC);
#else
		msleep(10);
#endif
	}

	do_gettimeofday(&end);
	elapsed_csecs64 = timeval_to_ns(&end) - timeval_to_ns(&start);
	do_div(elapsed_csecs64, NSEC_PER_SEC / 100);
	elapsed_csecs = elapsed_csecs64;

	if (todo) {
		/* This does not unfreeze processes that are already frozen
		 * (we have slightly ugly calling convention in that respect,
		 * and caller must call thaw_processes() if something fails),
		 * but it cleans up leftover PF_FREEZE requests.
		 */
		if(wakeup) {
			printk("\n");
			printk(KERN_ERR "Freezing of %s aborted\n",
					sig_only ? "user space " : "tasks ");
		}
		else {
			printk("\n");
			printk(KERN_ERR "Freezing of tasks failed after %d.%02d seconds "
			       "(%d tasks refusing to freeze, wq_busy=%d):\n",
			       elapsed_csecs / 100, elapsed_csecs % 100,
			       todo - wq_busy, wq_busy);
		}
		thaw_workqueues();

		read_lock(&tasklist_lock);
		do_each_thread(g, p) {
			task_lock(p);
			if (freezing(p) && !freezer_should_skip(p) &&
				elapsed_csecs > 100)
				sched_show_task(p);
			cancel_freezing(p);
			task_unlock(p);
		} while_each_thread(g, p);
		read_unlock(&tasklist_lock);
	} else {