Re: [PATCH 3/4] OOM, PM: OOM killed task shouldn't escape PM suspend

[Tejun Heo]

On Wed, Nov 05, 2014 at 02:42:19PM +0100, Michal Hocko wrote:
> On Wed 05-11-14 14:31:00, Michal Hocko wrote:
> > On Wed 05-11-14 08:02:47, Tejun Heo wrote:
> [...]
> > > Also, why isn't this part of
> > > oom_killer_disable/enable()?  The way they're implemented is really
> > > silly now.  It just sets a flag and returns whether there's a
> > > currently running instance or not.  How were these even useful? 
> > > Why can't you just make disable/enable to what they were supposed to
> > > do from the beginning?
> > 
> > Because then we would block all the potential allocators coming from
> > workqueues or kernel threads which are not frozen yet rather than fail
> > the allocation.
> 
> After thinking about this more it would be doable by using trylock in
> the allocation oom path. I will respin the patch. The API will be
> cleaner this way.

In disable, block new invocations of OOM killer and then drain the
in-progress ones.  This is a common pattern, isn't it?

-- 
tejun
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