Re: [PATCH] mm: Restore per-memcg proactive reclaim with !CONFIG_NUMA

[Shakeel Butt]

On Fri, Jan 16, 2026 at 08:52:47PM +0000, Yosry Ahmed wrote:
> Commit 2b7226af730c ("mm/memcg: make memory.reclaim interface generic")
> moved proactive reclaim logic from memory.reclaim handler to a generic
> user_proactive_reclaim() helper to be used for per-node proactive
> reclaim.
> 
> However, user_proactive_reclaim() was only defined under CONFIG_NUMA,
> with a stub always returning 0 otherwise. This broke memory.reclaim on
> !CONFIG_NUMA configs, causing it to report success without actually
> attempting reclaim.
> 
> Move the definition of user_proactive_reclaim() outside CONFIG_NUMA, and
> instead define a stub for __node_reclaim() in the !CONFIG_NUMA case.
> __node_reclaim() is only called from user_proactive_reclaim() when a
> write is made to sys/devices/system/node/nodeX/reclaim, which is only
> defined with CONFIG_NUMA.
> 
> Fixes: 2b7226af730c ("mm/memcg: make memory.reclaim interface generic")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Yosry Ahmed <yosry.ahmed@xxxxxxxxx>

Acked-by: Shakeel Butt <shakeel.butt@xxxxxxxxx>