lkml.org 
[lkml]   [2015]   [Jan]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch -rt 1/2] KVM: use simple waitqueue for vcpu->wq
On Fri, Jan 16, 2015 at 11:48:46AM -0500, Steven Rostedt wrote:
> I notice everywhere you have a swait_wake_interruptible() but here. Is
> there a reason why?
>
> IIRC, Peter wants to make swait wakeup usage homogenous. That is, you
> either sleep in an interruptible state, or you don't. You can't mix and
> match it.
>
> Peter is that what you plan?

Yes, this is required for the single wakeup case to be bounded.

If you have both INTERRUPTIBLE and UNINTERRUPTIBLE waiters on a list,
and you were allowed to do INTERRUPTIBLE/UNINTERRUPTIBLE wakeups, the
wakeup would have to do O(n) iteration to find a matching waiter.

Seeing that the entire purpose of simple wait queues was to retain RT
properties, that's entirely retarded ;-)


\
 
 \ /
  Last update: 2015-01-17 09:01    [W:0.186 / U:5.712 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site