On Thu, 22 Aug 2013 22:23:09 +0800 Lai Jiangshan <[email protected]> wrote:
> > By making it a irq-safe lock, we need to disable interrupts every time > > it is taken, which means the entire pi-chain walk in > > rt_mutex_adjust_prio_chain() will pretty much be with interrupts > > disabled. > > > I didn't catch your meaning. > rt_mutex_adjust_prio_chain() is called without wait_lock held. > current C.S. of wait_lock are really short. > There is quite a bit of overhead to enable and disable interrupts. If we are doing this in a very fast path, it's going to slow down -rt even more. It would be really nice to avoid making wait_lock be irq safe. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
