Re: [PATCH] mm: memcontrol: propagate NMI slab stats to memcg vmstats

[Johannes Weiner]

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@xxxxxxxxxxxxxxx
> Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>
> Signed-off-by: Alexandre Ghiti <alex@xxxxxxxx>

Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>