lkml.org 
[lkml]   [2019]   [May]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v4] x86/power: Fix 'nosmt' vs. hibernation triple fault during resume
On Fri, 31 May 2019, Jiri Kosina wrote:

> On Fri, 31 May 2019, Andy Lutomirski wrote:
>
> > 2. Put the CPU all the way to sleep by sending it an INIT IPI.
> >
> > Version 2 seems very simple and robust. Is there a reason we can't do
> > it? We obviously don't want to do it for normal offline because it
> > might be a high-power state, but a cpu in the wait-for-SIPI state is
> > not going to exit that state all by itself.
> >
> > The patch to implement #2 should be short and sweet as long as we are
> > careful to only put genuine APs to sleep like this. The only downside
> > I can see is that an new kernel resuming and old kernel that was
> > booted with nosmt is going to waste power, but I don't think that's a
> > showstopper.
>
> Well, if *that* is not an issue, than the original 3-liner that just
> forces them to 'hlt' [1] would be good enough as well.

Actually no, scratch that, I misunderstood your proposal, sorry.

--
Jiri Kosina
SUSE Labs

\
 
 \ /
  Last update: 2019-05-31 16:34    [W:0.109 / U:0.484 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site