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Tue, 24 Feb 2026 17:04:31 -0800 (PST) From: Askar Safin To: nphamcs@gmail.com Cc: akpm@linux-foundation.org, axelrasmussen@google.com, baohua@kernel.org, bhe@redhat.com, cgroups@vger.kernel.org, chengming.zhou@linux.dev, chrisl@kernel.org, christophe.leroy@csgroup.eu, gourry@gourry.net, hannes@cmpxchg.org, huang.ying.caritas@gmail.com, hughd@google.com, jannh@google.com, joshua.hahnjy@gmail.com, kasong@tencent.com, kernel-team@meta.com, len.brown@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, lorenzo.stoakes@oracle.com, mhocko@kernel.org, muchun.song@linux.dev, npache@redhat.com, osalvador@suse.de, pavel@kernel.org, peterx@redhat.com, pfalcato@suse.de, rafael@kernel.org, riel@surriel.com, roman.gushchin@linux.dev, ryan.roberts@arm.com, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, viro@zeniv.linux.org.uk, weixugc@google.com, yosry.ahmed@linux.dev, yuanchu@google.com, zhengqi.arch@bytedance.com Subject: Re: [PATCH v3 00/20] Virtual Swap Space Date: Wed, 25 Feb 2026 04:04:24 +0300 Message-ID: <20260225010425.2876986-1-safinaskar@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260208215839.87595-1-nphamcs@gmail.com> References: <20260208215839.87595-1-nphamcs@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Nhat Pham : > * Simplify and optimize swapoff: we only have to fault the page in and > have the virtual swap slot points to the page instead of the on-disk > physical swap slot. No need to perform any page table walking. Some time ago on Linux 6.1.124 I typed "swapoff -a". OOM killer started and killed all my apps. And "swapoff" itself eventially failed. So, it seems swapoff is very destructive operation. Please, make swapoff non-destructive. Or create some alternative non-destructive swapoff. Such swapoff should try to swapoff without killing anything. If this is not possible, it simply should return error. I don't think optimizing current dangerous swapoff is right thing to do. -- Askar Safin