lkml.org 
[lkml]   [2003]   [Aug]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] O13int for interactivity
At 06:20 PM 8/5/2003 +1000, Con Kolivas wrote:
>On Tue, 5 Aug 2003 18:12, Oliver Neukum wrote:
> > Am Dienstag, 5. August 2003 09:26 schrieb Con Kolivas:
> > > On Tue, 5 Aug 2003 16:03, Andrew Morton wrote:
> > > > We do prefer that TASK_UNINTERRUPTIBLE processes are woken promptly so
> > > > they can submit more IO and go back to sleep. Remember that we are
> > > > artificially leaving the disk head idle in the expectation that the
> > > > task will submit more I/O. It's pretty sad if the CPU scheduler leaves
> > > > the anticipated task in the doldrums for five milliseconds.
> > >
> > > Indeed that has been on my mind. This change doesn't affect how long it
> > > takes to wake up. It simply prevents tasks from getting full interactive
> > > status during the period they are doing unint. sleep.
> >
> > If you take that to its logical conclusion, such tasks should be woken
> > immediately. Likewise, the io scheduler should be notified when you know
> > that the task won't do io or will do other io, like waiting on character
> > devices, go paging out or terminate.
>
>Every experiment I've tried at putting tasks at the start of the queue
>instead
>of the end has resulted in some form of starvation so should not be possible
>for any user task and I've abandoned it.

(ditto:)

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:47    [W:0.116 / U:0.076 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site