linux-kernel - RE: [PATCH] mm/vmscan: add vm_swappiness configuration knobs

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Message-ID: <BL0PR02MB560169A483F201F1855C41A3E9F90@BL0PR02MB5601.namprd02.prod.outlook.com>
Date:   Mon, 16 Mar 2020 16:14:48 +0000
From:   Ivan Teterevkov <ivan.teterevkov@...anix.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Michal Hocko <mhocko@...nel.org>
CC:     "corbet@....net" <corbet@....net>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "mchehab+samsung@...nel.org" <mchehab+samsung@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "pawan.kumar.gupta@...ux.intel.com" 
        <pawan.kumar.gupta@...ux.intel.com>,
        "jgross@...e.com" <jgross@...e.com>,
        "oneukum@...e.com" <oneukum@...e.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: RE: [PATCH] mm/vmscan: add vm_swappiness configuration knobs

On Mon, 16 Mar 2020, Vlastimil Babka wrote:
> 
> Setting the vm_swappiness specific case aside, I wonder if if would be
> useful to be able to emulate any sysctl with a kernel parameter,
> i.e. boot the kernel with sysctl.vm.swappiness=X
> There are already some options that provide kernel parameter as well
> as sysctl, why not just support all.
>
It looks like a missing feature to me but I've always assumed that
there is some unobvious philosophical reasoning behind not having
such interfaces in the kernel. The feature-wise I'd be one of the
first users of the sysctl command-line parameters.