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Message-ID: <69871de2-af48-4ce9-9612-f87132337a84@suse.cz>
Date: Wed, 30 Apr 2025 14:26:12 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Shakeel Butt <shakeel.butt@...ux.dev>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Johannes Weiner <hannes@...xchg.org>, Michal Hocko <mhocko@...nel.org>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Muchun Song <muchun.song@...ux.dev>,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>, linux-mm@...ck.org,
cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
Meta kernel team <kernel-team@...a.com>
Subject: Re: [PATCH 4/4] memcg: no irq disable for memcg stock lock
On 4/30/25 01:04, Shakeel Butt wrote:
> There is no need to disable irqs to use memcg per-cpu stock, so let's
> just not do that. One consequence of this change is if the kernel while
> in task context has the memcg stock lock and that cpu got interrupted.
> The memcg charges on that cpu in the irq context will take the slow path
> of memcg charging. However that should be super rare and should be fine
> in general.
>
> Signed-off-by: Shakeel Butt <shakeel.butt@...ux.dev>
Acked-by: Vlastimil Babka <vbabka@...e.cz>
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