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

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Message-ID: <4e08008f-bf20-6a9c-0ffb-f6438c326612@suse.cz>
Date:   Tue, 17 Mar 2020 15:51:06 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Ivan Teterevkov <ivan.teterevkov@...anix.com>,
        "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 3/17/20 9:29 AM, Michal Hocko wrote:
> On Mon 16-03-20 15:53:21, Vlastimil Babka wrote:
>> On 3/12/20 2:26 PM, Michal Hocko wrote:
> 
> This sounds like a much better idea than a case by case handling. I
> wouldn't be surprised if some kernel parameters would duplicate sysctl
> values. I cannot judge the implementation unfortunately but from a quick
> glance it makes sense to me. Especially where you hooked it into because
> not all handlers are simple setters for a global value. Some of them
> have a much more complicated logic which requires a lot of
> infrastructure to be set up already. So putting do_sysctl_args right
> before the init is executed should be good enough.
> 
> Care to post an RFC to a larger audience? Let's see where we get from
> there.

FYI done: (I didn't CC everybody from this thread)

https://lore.kernel.org/linux-api/20200317132105.24555-1-vbabka@suse.cz/