lkml.org 
[lkml]   [2007]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] RT: Add priority-queuing and priority-inheritance to workqueue infrastructure
On 08/01, Peter Zijlstra wrote:
>
> On Tue, 2007-07-31 at 20:52 -0700, Daniel Walker wrote:
>
> > static void insert_work(struct cpu_workqueue_struct *cwq,
> > struct work_struct *work, int tail)
> > {
> > + int prio = current->normal_prio;
> > +
> > set_wq_data(work, cwq);
> > /*
> > * Ensure that we get the right work->data if we see the
> > * result of list_add() below, see try_to_grab_pending().
> > */
> > smp_wmb();
> > - if (tail)
> > - list_add_tail(&work->entry, &cwq->worklist);
> > - else
> > - list_add(&work->entry, &cwq->worklist);
> > + plist_node_init(&work->entry, prio);
> > + plist_add(&work->entry, &cwq->worklist);

Sorry, this patch is completely wrong. It immediately breaks
flush_workqueue/cancel_workqueue functions.

And I personally think it is not very useful, even if it was correct.
You can create your own workqueue and change the priority of cwq->thread.

> > @@ -168,7 +171,7 @@ int fastcall queue_work(struct workqueue
> > int ret = 0, cpu = raw_smp_processor_id();
> >
> > if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
> > - BUG_ON(!list_empty(&work->entry));
> > + BUG_ON(!plist_node_empty(&work->entry));
> > __queue_work(wq_per_cpu(wq, cpu), work);
> > ret = 1;

Side note, looks like you use some strange kernel. This raw_smp_processor_id()
above is wrong.

Oleg.

-
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: 2007-08-01 20:15    [W:0.096 / U:0.312 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site