(No subject header)

[Milton Miller <miltonm@bga.com>]

[Hmm, why did this not appear in patchwork.kernel.org?  Now
I have to guess a CC list.]

On Wed, 26 May 2010 around 22:43:50 -0400 (EDT), Len Brown wrote:
> From: Len Brown <len.brown@intel.com>
> 
> TS_POLLING set tells the scheduler a task will poll
> need_resched() to look for work.
> 

True

> TS_POLLING clear tells resched_task() and wake_up_idle_cpu()
> that the remote CPU is sleeping in idle, and thus requires
> a reschedule interrupt to wake them to notice work.

No, that only applies to the idle task.


> 
> Update the description of TS_POLLING to reflect how it works.
> "cleared when sleeping in idle, requiring reschedule interrupt"

That would imply its set for every normal task that is not in some
kind of sleep state.


> 
> Signed-off-by: Len Brown <len.brown@intel.com>
> Acked-by: Peter Zijlstra <peterz@infradead.org>

> -#define TS_POLLING		0x0004	/* true if in idle loop
> -					   and not sleeping */
> +#define TS_POLLING		0x0004	/* clear when sleeping in idle
> +					   requiring reschedule interrupt */

How about "idle task polling need_resched, skip sending interrupt"?

milton