linux-kernel - Re: [RFC] kernel/sysctl: support setting sysctl parameters from kernel command line

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Date:   Tue, 24 Mar 2020 11:24:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        linux-kernel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-mm@...ck.org, Ivan Teterevkov <ivan.teterevkov@...anix.com>,
        Michal Hocko <mhocko@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>
Subject: Re: [RFC] kernel/sysctl: support setting sysctl parameters from
 kernel command line

On Tue, Mar 24, 2020 at 05:50:49PM +0100, Vlastimil Babka wrote:
> On 3/17/20 10:29 PM, Kees Cook wrote:
> > mm.transparent_hugepage.enabled
> 
> Hm, transparent_hugepage is in sysfs (/sys/kernel/mm), but not sysctl, at least
> in my case the sysctl tool doesn't list it. Yours does? Yay for consistency.

Oh, whoops! That was my mistake; my eyes skipped out of /proc/sys ;)

> > I like the idea if just for having to build less boiler plate for
> > supporting things that I've had to plumb to both boot_params and sysctl.
> > :)
> 
> Thanks, I will pursue the idea further then :)

Awesome! I've wanted this for a long time but never had the time to give
it a try. :)

-- 
Kees Cook