linux-kernel - Re: [PATCH] mm/memcontrol: respect zswap.writeback setting from parent cg too

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Message-ID: <CAKEwX=M-BDNNJo5-LXj3iR51BksH4t-fZhFDD4Kt_DvNqj7oUQ@mail.gmail.com>
Date: Tue, 20 Aug 2024 11:28:21 -0400
From: Nhat Pham <nphamcs@...il.com>
To: Yosry Ahmed <yosryahmed@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Mike Yuan <me@...dnzj.com>, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, cgroups@...r.kernel.org, 
	Muchun Song <muchun.song@...ux.dev>, Shakeel Butt <shakeel.butt@...ux.dev>, 
	Roman Gushchin <roman.gushchin@...ux.dev>, Michal Hocko <mhocko@...nel.org>, 
	Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH] mm/memcontrol: respect zswap.writeback setting from
 parent cg too

On Mon, Aug 19, 2024 at 9:07 PM Yosry Ahmed <yosryahmed@...gle.com> wrote:
>
>
> It's commit 501a06fe8e4c ("zswap: memcontrol: implement zswap
> writeback disabling"). It landed in v6.8.
>
> I suspect there aren't many users that depend on the old behavior so
> far, so I would prefer to get this backported so that it's less likely
> that more (or any) users start depending on the old behavior.

Agree - let's backport it then. In hindsight, I feel like this is
already what users assume. We don't rely on the assumption internally,
but at least one client of ours has asked for clarifications about
this.