lkml.org 
[lkml]   [2011]   [Dec]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC] virtio_net: fix refill related races
Hello, Michael.

On Tue, Dec 20, 2011 at 09:09:08PM +0200, Michael S. Tsirkin wrote:
> Another question, wanted to make sure:
> virtnet_poll does schedule_delayed_work(&vi->refill, 0);
> separately refill work itself also does
> schedule_delayed_work(&vi->refill, HZ/2);
> If two such events happen twice, on different CPUs, we are still guaranteed
> the work will only run once, right?

No, it's not. Normal workqueues only guarantee non-reentrance on
local CPU. If you want to guarantee that only one instance of a given
item is executing across all CPUs, you need to use the nrt workqueue.

Thanks.

--
tejun


\
 
 \ /
  Last update: 2011-12-20 20:13    [W:0.068 / U:0.088 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site