static void hkey_poll_stop(void)
{
if (hkey_poll_task) {
if (frozen(hkey_poll_task) || freezing(hkey_poll_task))
thaw_process(hkey_poll_task);
kthread_stop(hkey_poll_task);
hkey_poll_task = NULL;
mutex_lock(&hkey_poll_mutex);
/* at this point, the thread did exit */
mutex_unlock(&hkey_poll_mutex);
}
}
void thaw_processes(void)
{
struct task_struct *g, *p;
printk( "Restarting tasks..." );
read_lock(&tasklist_lock);
do_each_thread(g, p) {
if (!freezeable(p))
continue;
if (!thaw_process(p))
printk(KERN_INFO " Strange, %s not stopped\n", p->comm );
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
schedule();
printk( " done\n" );
}
static void hkey_poll_stop(void)
{
if (hkey_poll_task) {
if (frozen(hkey_poll_task) || freezing(hkey_poll_task))
#if LINUX_VERSION_CODE < KERNEL_VERSION(3,3,0)
thaw_process(hkey_poll_task);
#else
wake_up_process(hkey_poll_task);
#endif
kthread_stop(hkey_poll_task);
hkey_poll_task = NULL;
mutex_lock(&hkey_poll_mutex);
/* at this point, the thread did exit */
mutex_unlock(&hkey_poll_mutex);
}
}
static void thaw_tasks(int thaw_user_space)
{
struct task_struct *g, *p;
read_lock(&tasklist_lock);
do_each_thread(g, p) {
if (!freezeable(p))
continue;
if (is_user_space(p) == !thaw_user_space)
continue;
if (!thaw_process(p))
printk(KERN_WARNING " Strange, %s not stopped\n",
p->comm );
} while_each_thread(g, p);
read_unlock(&tasklist_lock);
}
/*
* Simple selection loop. We chose the process with the highest
* number of 'points'. We expect the caller will lock the tasklist.
*
* (not docbooked, we don't want this one cluttering up the manual)
*/
static struct task_struct *select_bad_process(unsigned int *ppoints,
unsigned long totalpages, struct mem_cgroup *mem,
const nodemask_t *nodemask)
{
struct task_struct *g, *p;
struct task_struct *chosen = NULL;
*ppoints = 0;
do_each_thread(g, p) {
unsigned int points;
if (p->exit_state)
continue;
if (oom_unkillable_task(p, mem, nodemask))
continue;
/*
* This task already has access to memory reserves and is
* being killed. Don't allow any other task access to the
* memory reserve.
*
* Note: this may have a chance of deadlock if it gets
* blocked waiting for another task which itself is waiting
* for memory. Is there a better alternative?
*/
if (test_tsk_thread_flag(p, TIF_MEMDIE)) {
if (unlikely(frozen(p)))
thaw_process(p);
return ERR_PTR(-1UL);
}
if (!p->mm)
continue;
if (p->flags & PF_EXITING) {
/*
* If p is the current task and is in the process of
* releasing memory, we allow the "kill" to set
* TIF_MEMDIE, which will allow it to gain access to
* memory reserves. Otherwise, it may stall forever.
*
* The loop isn't broken here, however, in case other
* threads are found to have already been oom killed.
*/
if (p == current) {
chosen = p;
*ppoints = 1000;
} else {
/*
* If this task is not being ptraced on exit,
* then wait for it to finish before killing
* some other task unnecessarily.
*/
if (!(p->group_leader->ptrace & PT_TRACE_EXIT))
return ERR_PTR(-1UL);
}
}
points = oom_badness(p, mem, nodemask, totalpages);
if (points > *ppoints) {
chosen = p;
*ppoints = points;
}
} while_each_thread(g, p);
void wake_timer_func(unsigned long arg)
{
printk(KERN_ERR "Waking up task waiting on wake lock\n");
thaw_process(arg);
}
