Hello, On Mon, 11 May 2015, Peter Zijlstra wrote:
> > - schedule_timeout_idle (instead of schedule_timeout call): > > __set_current_state(TASK_IDLE); > > return schedule_timeout(timeout); > > > > - we here are really idle, so "N" looks ok > > So I don't get the point of the schedule_timeout_*() stubs. What are > they for? Why would one use an unconditional schedule_timeout() call? > Isn't that what msleep() is for? msleep will not return until timeout has expired. Instead, we want to notice the kthread_should_stop() event immediately. Additionally, TASK_UNINTERRUPTIBLE will increase the load average. We can do it with extra wait queue and the new __wait_event_idle_timeout but I guess schedule_timeout_idle will be a good replacement for schedule_timeout_interruptible calls when used for kthreads. > + * like wait_event_timeout() -- except it uses TASK_IDLE to avoid loadavg > + */ > +#define wait_event_idle_timeout(wq, condition, timeout) > \ > +({ \ > + long __ret = timeout; \ > + might_sleep(); \ > + if (!___wait_cond_timeout(condition)) \ > + ret = __wait_event_idle_timeout(wq, condition, timeout);\ ret may need underscores here... Regards -- Julian Anastasov <j...@ssi.bg> -- 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/