linux-kernel - Re: [PATCH] memcg: drain obj stock on cpu hotplug teardown

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Message-ID: <Z9BkOgZIK1iSQKd5@google.com>
Date: Tue, 11 Mar 2025 16:26:34 +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>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Meta kernel team <kernel-team@...a.com>, stable@...r.kernel.org
Subject: Re: [PATCH] memcg: drain obj stock on cpu hotplug teardown

On Mon, Mar 10, 2025 at 04:09:34PM -0700, Shakeel Butt wrote:
> Currently on cpu hotplug teardown, only memcg stock is drained but we
> need to drain the obj stock as well otherwise we will miss the stats
> accumulated on the target cpu as well as the nr_bytes cached. The stats
> include MEMCG_KMEM, NR_SLAB_RECLAIMABLE_B & NR_SLAB_UNRECLAIMABLE_B. In
> addition we are leaking reference to struct obj_cgroup object.
> 
> Fixes: bf4f059954dc ("mm: memcg/slab: obj_cgroup API")
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>
> Cc: <stable@...r.kernel.org>

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

Thanks!