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

[Guilherme G. Piccoli]

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.

As I've said before, Ubuntu kdump rely on rootfs mounting and there's no 
official statement or documentation that say it's wrong to do this way - 
although I agree initrd-only approach is more safe. But since Ubuntu 
kdump rely on rootfs mount, we couldn't find a way to effectively 
prevent the creation of hugepages completely, hence we tried to 
introduce one.

Cheers,


Guilherme