linux-kernel - Re: [PATCH v1 3/6] memcg-v1: no need for memcg locking for dirty tracking

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Message-ID: <ZxvX8beTxGhRj8G3@google.com>
Date: Fri, 25 Oct 2024 17:40:01 +0000
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Shakeel Butt <shakeel.butt@...ux.dev>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...nel.org>,
	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 3/6] memcg-v1: no need for memcg locking for dirty
 tracking

On Thu, Oct 24, 2024 at 06:23:00PM -0700, Shakeel Butt wrote:
> During the era of memcg charge migration, the kernel has to be make sure
> that the dirty stat updates do not race with the charge migration.
> Otherwise it might update the dirty stats of the wrong memcg. Now with
> the memcg charge migration deprecated, there is no more race for dirty
> stat updates and the previous locking can be removed.
> 
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>

Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>