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

From: Michal Hocko
Date: Tue Oct 15 2019 - 08:18:13 EST

On Fri 11-10-19 21:41:01, Guilherme Piccoli wrote:
> On Fri, Oct 11, 2019 at 8:52 PM Qian Cai <cai@xxxxxx> wrote:
> >
> >
> > It simply error-prone to reuse the sysctl.conf from the first kernel, as it could contains lots of things that will kill kdump kernel.
> Makes sense, I agree with you. But still, there's no
> formal/right/single way to do kdump, so I don't think we should rely
> on "rootfs kdump is wrong" to refuse this patch's idea. If so, we
> should then formalize the right way of kdumping.
> Of course, this is only my opinion, let's see what people think about it!

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.
Michal Hocko