linux-kernel - Re: [PATCH v2 0/3] support setting sysctl parameters from kernel command line

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Message-ID: <20200415100146.GC4629@dhcp22.suse.cz>
Date:   Wed, 15 Apr 2020 12:01:46 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Kees Cook <keescook@...omium.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>,
        David Rientjes <rientjes@...gle.com>,
        Matthew Wilcox <willy@...radead.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        "Guilherme G . Piccoli" <gpiccoli@...onical.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: Re: [PATCH v2 0/3] support setting sysctl parameters from kernel
 command line

On Wed 15-04-20 10:56:35, Vlastimil Babka wrote:
> On 4/15/20 5:23 AM, Masami Hiramatsu wrote:
> > Hi Vlastimil,
> > 
> > On Tue, 14 Apr 2020 13:32:19 +0200
> > Vlastimil Babka <vbabka@...e.cz> wrote:
> > 
> >> This series adds support for something that seems like many people always
> >> wanted but nobody added it yet, so here's the ability to set sysctl parameters
> >> via kernel command line options in the form of sysctl.vm.something=1
> > 
> > Sounds good. And would you consider to use the bootconfig instead of (or
> > in addition to) the kernel command line, because it is too short to describe
> > the sysctl options?
> 
> "Instead of" - no, as that would defeat the scenario of "I just want to set this
> one sysctl in grub  (possibly interactively) and not update initrd for that". If
> constructing bootconfig is of similar effort of loading sysctl.conf from initrd,
> then I see little benefit?
> 
> "in addition to" - sure! but I hoped that's what already happens as it seemed to
> me that options from bootconfig are appended to the command line that's then
> parsed by everyone else, no? But I'll try it to be sure.

Completely agreed!

Btw. patches look sensible to me so feel free to add
Acked-by: Michal Hocko <mhocko@...e.com>

-- 
Michal Hocko
SUSE Labs