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Fri, 10 Jul 2026 05:21:48 -0700 (PDT) Date: Fri, 10 Jul 2026 08:21:45 -0400 From: Johannes Weiner To: Ridong Cc: Michal Hocko , Roman Gushchin , Shakeel Butt , Andrew Morton , Chris Li , Kairui Song , Muchun Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Ridong Chen Subject: Re: [PATCH -next] memcg: move mem_cgroup_swappiness to memcontrol.h Message-ID: References: <20260710111224.2355668-1-ridong.chen@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@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: <20260710111224.2355668-1-ridong.chen@linux.dev> On Fri, Jul 10, 2026 at 07:12:24PM +0800, Ridong wrote: > From: Ridong Chen > > The per-memcg swappiness knob is v1-only; v2 always uses global > vm_swappiness and ignores the per-cgroup field. > > Guard memcg->swappiness with CONFIG_MEMCG_V1, and move the helper > to memcontrol.h where it belongs. > > No functional change for v1; v2-only kernels drop the unused field. > > Signed-off-by: Ridong Chen Nice. Acked-by: Johannes Weiner