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

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Message-Id: <4641B95A-6DD8-4E8A-AD53-06E7B72D956C@lca.pw>
Date:   Fri, 11 Oct 2019 19:52:48 -0400
From:   Qian Cai <cai@....pw>
To:     Guilherme Piccoli <gpiccoli@...onical.com>
Cc:     linux-mm@...ck.org, mike.kravetz@...cle.com,
        linux-kernel@...r.kernel.org,
        Jay Vosburgh <jay.vosburgh@...onical.com>,
        "Guilherme G. Piccoli" <kernel@...ccoli.net>
Subject: Re: [PATCH] hugetlb: Add nohugepages parameter to prevent hugepages creation



> On Oct 11, 2019, at 7:42 PM, Guilherme Piccoli <gpiccoli@...onical.com> wrote:
> 
> Thanks for the quick response. Kdump in Ubuntu, for example, rely in
> mounting the root filesystem.
> Even in initrd-only approaches, we could have sysctl.conf being copied
> to initramfs, and hugepages end-up getting set.

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.