Re: [PATCH v3] mm: fix tick timer stall during deferred page init

[Daniel Jordan]

On Wed, Apr 01, 2020 at 06:12:43PM +0200, Michal Hocko wrote:
> On Wed 01-04-20 12:09:29, Daniel Jordan wrote:
> > On Wed, Apr 01, 2020 at 06:00:48PM +0200, Michal Hocko wrote:
> > > On Wed 01-04-20 17:50:22, David Hildenbrand wrote:
> > > > On 01.04.20 17:42, Michal Hocko wrote:
> > > > > This needs a double checking but I strongly believe that the lock can be
> > > > > simply dropped in this path.
> > 
> > This is what my fix does, it limits the time the resize lock is held.
> 
> Just remove it from the deferred intialization and add a comment that we
> deliberately not taking the lock here because abc

I think it has to be a little more involved because of the window where
interrupts might allocate during deferred init, as Vlastimil pointed out a few
years ago when the change was made.  I'll explain myself in the changelog.