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Wed, 11 Mar 2026 19:36:44 -0700 (PDT) Received: from redhat.com ([209.132.188.88]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-35a02e7a2edsm3687683a91.7.2026.03.11.19.36.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Mar 2026 19:36:44 -0700 (PDT) Date: Thu, 12 Mar 2026 10:36:42 +0800 From: Li Wang To: Yosry Ahmed Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Johannes Weiner , Michal Hocko , Michal =?utf-8?Q?Koutn=C3=BD?= , Muchun Song , Nhat Pham , Tejun Heo , Roman Gushchin , Shakeel Butt Subject: Re: [PATCH 4/5] selftest/cgroup: fix zswap test_no_invasive_cgroup_shrink on 64K pagesize system Message-ID: References: <20260311110523.26624-1-liwang@redhat.com> <20260311110523.26624-4-liwang@redhat.com> 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Mar 11, 2026 at 12:01:24PM -0700, Yosry Ahmed wrote: > On Wed, Mar 11, 2026 at 4:06 AM Li Wang wrote: > > > > The test_no_invasive_cgroup_shrink and allocate_bytes use a hardcoded > > stride of 4095 bytes when touching allocated pages. On systems with 64K > > page size, this results in writing to the same page multiple times > > instead of touching all pages, leading to insufficient memory pressure. > > > > Additionally, the original memory limits and allocation sizes are too > > small for 64K page size systems. With only 1M memory.max, there are > > very few pages available, and a zswap.max of 10K may not provide enough > > room to store even a single compressed page. This can cause OOM kills > > or false positives due to insufficient zswap writeback being triggered. > > > > Fix these issues by: > > - Using sysconf(_SC_PAGESIZE) instead of the hardcoded 4095 stride in > > both allocate_bytes() and test_no_invasive_cgroup_shrink(). > > AFAICT there are other instances of hardcoded 4095 and 4096 values in > the test, do you mind having a separate patch that updates all of them > to the runtime value? Good point, I will achive it in patch V2. Thanks! -- Regards, Li Wang