lkml.org 
[lkml]   [2010]   [May]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
Subject(No subject header)

[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


\
 
 \ /
  Last update: 2010-05-27 07:27    [W:0.135 / U:9.888 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site