Re: [PATCH 1/2] Revert "vmalloc: back off when the current task is killed"

From: Michal Hocko
Date: Thu Oct 05 2017 - 05:14:06 EST

On Wed 04-10-17 19:18:21, Johannes Weiner wrote:
> On Wed, Oct 04, 2017 at 03:32:45PM -0700, Andrew Morton wrote:
> > You don't think they should be backported into -stables?
> Good point. For this one, it makes sense to CC stable, for 4.11 and
> up. The second patch is more of a fortification against potential
> future issues, and probably shouldn't go into stable.

I am not against. It is true that the memory reserves depletion fix was
theoretical because I haven't seen any real life bug. I would argue that
the more robust allocation failure behavior is a stable candidate as
well, though, because the allocation can fail regardless of the vmalloc
revert. It is less likely but still possible.
Michal Hocko