On Wed, Nov 13, 2013 at 06:07:24PM +0100, Oleg Nesterov wrote: > 4. Finally, change try_to_wake_up() path to do > > - p->state = TASK_WAKING; > + p->state &= ~state; > + if (p->state & ~(TASK_DEAD | TASK_WAKEKILL | > TASK_PARKED)) > + return; > + else > + p->state = TASK_WAKING; > > IOW, if the task sleeps in, say, TASK_INTERRUPTIBLE | __TASK_FROZEN > then it need both try_to_wake_up(TASK_INTERRUPTIBLE) and > try_to_wake_up(__TASK_FROZEN) to wake up.
> Tejun, Peter, do you think this makes any sense? I am just curious, but > "selective wakeup" looks potentially useful. I've never looked at any of this freeze stuff, so I cannot comment too much. However we should be very careful not to add too much to relative hot paths for the relative rare case of freezing stuff. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
