linux-kernel - Re: [PATCH v1 4/6] memcg-v1: no need for memcg locking for writeback tracking

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Message-ID: <20241028140047.GD10985@cmpxchg.org>
Date: Mon, 28 Oct 2024 10:00:47 -0400
From: Johannes Weiner <hannes@...xchg.org>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Michal Hocko <mhocko@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Hugh Dickins <hughd@...gle.com>,
	Yosry Ahmed <yosryahmed@...gle.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-doc@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>
Subject: Re: [PATCH v1 4/6] memcg-v1: no need for memcg locking for writeback
 tracking

On Thu, Oct 24, 2024 at 06:23:01PM -0700, Shakeel Butt wrote:
> During the era of memcg charge migration, the kernel has to be make sure
> that the writeback stat updates do not race with the charge migration.
> Otherwise it might update the writeback stats of the wrong memcg. Now
> with the memcg charge migration deprecated, there is no more race for
> writeback stat updates and the previous locking can be removed.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Acked-by: Johannes Weiner <hannes@...xchg.org>