linux-kernel - Re: [RFC PATCH 05/10] memcg: no refilling stock from obj_cgroup

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Message-ID: <20250314112627.dPKeawXj@linutronix.de>
Date: Fri, 14 Mar 2025 12:26:27 +0100
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: Re: [RFC PATCH 05/10] memcg: no refilling stock from
 obj_cgroup_release

On 2025-03-13 23:15:06 [-0700], Shakeel Butt wrote:
> obj_cgroup_release is called when all the references to the objcg has

"references to the objcg have"

> been released i.e. no more memory objects are pointing to it. Most
> probably objcg->memcg will be pointing to some ancestor memcg and at the
> moment, in obj_cgroup_release, the kernel call
> obj_cgroup_uncharge_pages() to uncharge last remaining memory.

This sounds somehow funny. I think the point is to uncharge the pages
without tampering memcg_stock because it is unnecessary.

> However obj_cgroup_uncharge_pages() refills the local stock. There is
> no need to refill the local stock with some ancestor memcg and flush the
> local stock. In addition this removes the requirement to only call
> obj_cgroup_put() outside of local_lock.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Sebastian