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From: Li Wang To: Andrew Morton Cc: tj@kernel.org, longman@redhat.com, roman.gushchin@linux.dev, hannes@cmpxchg.org, yosry@kernel.org, jiayuan.chen@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, mkoutny@suse.com, shuah@kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 0/8] selftests/cgroup: improve zswap tests robustness and support large page sizes Message-ID: References: <20260424040059.12940-1-li.wang@linux.dev> <20260424030605.6d0053c0df14bba325114e1b@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260424030605.6d0053c0df14bba325114e1b@linux-foundation.org> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: zxee9nfig3aat44gh87dazh6z9uymgs1 X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 5BA8AC000D X-Rspam-User: X-HE-Tag: 1777029292-123339 X-HE-Meta: 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 nchsPO9p GSKcT3Dvn6u1A4q2LiViEECpuljMj/9lbZ3WjUABLwMAOu0I4IF7bD5yT4W57AhIpOM404ukRsW68+vSrPBby4hFcjOFk8IokEIwGJkSGpVOm65rZs8QA9hHJO47JCXd7gzOK/EwC91AHohONdRcswchO4RhaMpDyLsHsW1Vpyd4lcEJaNlJZW1LyUcxDuPfEPs7+drPsaxKUSKjGTuQCnKFWoQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Apr 24, 2026 at 03:06:05AM -0700, Andrew Morton wrote: > On Fri, 24 Apr 2026 12:00:51 +0800 Li Wang wrote: > > > This patchset aims to fix various spurious failures and improve the overall > > robustness of the cgroup zswap selftests. > > Great, thanks, I'll queue this in mm.git's mm-new branch. Next week > I'll move it into mm-unstable, where it will receive liunx-next > exposure. > > > The primary motivation is to make the tests compatible with architectures > > that use non-4K page sizes (such as 64K on ppc64le and arm64). Currently, > > the tests rely heavily on hardcoded 4K page sizes and fixed memory limits. > > Well that's an oops. > > > On 64K page size systems, these hardcoded values lead to sub-page granularity > > accesses, incorrect page count calculations, and insufficient memory pressure > > to trigger zswap writeback, ultimately causing the tests to fail. > > I assume you've been testing on arm64 or ppc? Yes, before sending, I teseted the patchset on: x86_64(4k), aarch64(4K, 64K), ppc64le(64K) -- Regards, Li Wang