linux-kernel - RE: [RFC] memcg: fix default behaviour of non-overridden memcg.swappiness

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Message-ID: <MN2PR02MB63033A5D2EE11A0D7DFEBE95E9DA0@MN2PR02MB6303.namprd02.prod.outlook.com>
Date:   Tue, 14 Apr 2020 16:08:39 +0000
From:   Ivan Teterevkov <ivan.teterevkov@...anix.com>
To:     Michal Hocko <mhocko@...nel.org>
CC:     "rientjes@...gle.com" <rientjes@...gle.com>,
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        Jonathan Davies <jond@...anix.com>
Subject: RE: [RFC] memcg: fix default behaviour of non-overridden
 memcg.swappiness

On Fri, 20 Mar 2020, Michal Hocko wrote:
> On Thu 19-03-20 17:38:30, Ivan Teterevkov wrote:
> > Also, shall this magic -1 be exposed to the user? I think it's a "no",
> > but what if the user wants to un-override the memcg.swappiness...
> 
> If we are to use such a semantic then it absolutely has to be an opt-in behavior
> and expressed in some way to the user space (e.g. a symbolic name referring to
> the global setting).

A symbolic link would be a good approach but...

> I am not convinced we need it.

... agree and not going any further with the suggestion.

Support of the sysctl parameters in the kernel command line is a
better solution and would address my initially raised concern to
tackle the configuration parameters.

Thanks
Ivan