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

[Guilherme G. Piccoli]

On 10/15/19 11:05 AM, Michal Hocko wrote:
> 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.


OK, thanks Michal and Qian, I'll try to make things work from kdump 
perspective. The trick part is exactly preventing the sysctl to get 
applied heh

Cheers,


Guilherme