Re: [PATCH] hugetlb: Add nohugepages parameter to prevent hugepages creation

From: Michal Hocko
Date: Tue Oct 15 2019 - 10:05:12 EST

On Tue 15-10-19 10:58:36, Guilherme G. Piccoli wrote:
> On 10/15/19 9:18 AM, Michal Hocko wrote:
> > I do agree with Qian Cai here. Kdump kernel requires a very tailored
> > environment considering it is running in a very restricted
> > configuration. The hugetlb pre-allocation sounds like a tooling problem
> > and should be fixed at that layer.
> >
> Hi Michal, thanks for your response. Can you suggest me a current way of
> preventing hugepages for being created, using userspace? The goal for this
> patch is exactly this, introduce such a way.

Simply restrict the environment to not allocate any hugepages? Kdump
already controls the kernel command line and it also starts only a very
minimal subset of services. So who is allocating those hugepages?
sysctls should be already excluded by default as Qian mentioned.
Michal Hocko