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

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Message-ID: <CAHD1Q_ynd6f2Jc54k1D9JjmtD6tGhkDcAHRzd5nZt5LUdQTvaw@mail.gmail.com>
Date:   Fri, 11 Oct 2019 20:41:31 -0300
From:   Guilherme Piccoli <gpiccoli@...onical.com>
To:     Qian Cai <cai@....pw>
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 Fri, Oct 11, 2019 at 8:36 PM Qian Cai <cai@....pw> wrote:
>
> Typically, kdump kernel has its own initramfs, and don’t even need to mount a rootfs, so I can’t see how sysfs/sysctl is relevant here.

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.

Also, I don't think the "nohugepages" is useful only for kdump - I
found odd we cannot prevent the creation of hugepages at all when
using sysfs writes.

Cheers,

Guilherme