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Mon, 18 May 2026 06:21:56 -0700 (PDT) Date: Mon, 18 May 2026 09:21:56 -0400 From: Johannes Weiner To: Alexandre Ghiti Cc: Andrew Morton , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Vlastimil Babka , stable@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Subject: Re: [PATCH] mm: memcontrol: propagate NMI slab stats to memcg vmstats Message-ID: References: <20260518082830.599102-1-alex@ghiti.fr> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260518082830.599102-1-alex@ghiti.fr> On Mon, May 18, 2026 at 10:28:19AM +0200, Alexandre Ghiti wrote: > flush_nmi_stats() drains per-node NMI slab atomics into the per-node > lruvec_stats, but does not propagate them to the memcg-level vmstats. > > For non NMI case, account_slab_nmi_safe() calls mod_memcg_lruvec_state() > which updates both per-node lruvec_stats and memcg-level vmstats, so > flush_nmi_stats() needs to flush to per-node lruvec_stats as well as > memcg-level vmstats. > > So fix this by flushing to the memcg-level vmstats for NMI too. > > Fixes: 940b01fc8dc1 ("memcg: nmi safe memcg stats for specific archs") > Cc: stable@vger.kernel.org > Acked-by: Shakeel Butt > Signed-off-by: Alexandre Ghiti Acked-by: Johannes Weiner