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(unknown []) by gzga-smtp-mtada-g0-0 (Coremail) with SMTP id _____wBnrLh2H95pqLbvEg--.46126S2; Tue, 14 Apr 2026 19:05:28 +0800 (CST) From: ranxiaokai627@163.com To: hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, tj@kernel.org, mkoutny@suse.com, shuah@kernel.org, kuba@kernel.org, hughd@google.com, akpm@linux-foundation.org Cc: cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, ran.xiaokai@zte.com.cn, ranxiaokai627@163.com Subject: [PATCH 0/2] kselftests: cgroup: fix test_kmem false failures Date: Tue, 14 Apr 2026 11:05:22 +0000 Message-ID: <20260414110524.2414-1-ranxiaokai627@163.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wBnrLh2H95pqLbvEg--.46126S2 X-Coremail-Antispam: 1Uf129KBjvdXoWrtw47WF4ftFW7AFW3CrW3Wrg_yoWDuwcEva y2yrZ7t395AayqkFZrtrn8XrWS93y7JF4aqF1qqF17JFyUJr4UJFn7Xr1UZ3WxWa13GFya vF9YvFyftr1IyjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRAa9aDUUUUU== X-Originating-IP: [2409:8a62:14:edb0:5054:ff:fe85:ffcf] X-CM-SenderInfo: xudq5x5drntxqwsxqiywtou0bp/xtbC7Rj3RGneH3iPtwAA3u X-Rspamd-Queue-Id: 59486C0007 X-Stat-Signature: 9xajhzupisr8hfuoqgynj3im9bm5qd7k X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1776164757-221296 X-HE-Meta: U2FsdGVkX1/KVT3c/Vo92Xze1DkIAW4HXOBUdIFBlgy8lo19LfsGoWIdfN/i/v+bLIHnZydvkzlOyM+rkQqGzswDzU2eqAKGr2UNYc0qhooEJdM/UAyMul5zE6yEgMyiWqcZCXN8JlV3nI2c92NUerDPFyGHB7/i6P/Gc051v7Jpk8bLBfyFShEGq5DGETQWVYr80MuYIixVWBqwsYZLLUfQDzBOSOOy8rjzhjLuJwnOGF5kLltjzJjzBXMPmG/qf4bQDD2ONu0dJdpXtKJUEuPPEk7Nx/jWPf8JNORyUa3kaxwoUBcIFLWv8mxudC57f5QXdBDGSfwKQM/nI4l5P+5mjbn7qKV1s1npnuJh5XvvcNv8Uj++fSJmr4cuGiWg3aGZRoFLD2r2GtEVwi9RYImIxwzntEuJnCeqI8TYnQcshOUHys/x2achNkxsG3OHLo3oGawr0nEwr1NiNemM0F7zdI3JzntKpKmRH1/LuY6yG9b18/TRFFOormWKR4mE3qcbgv9tHNvI+7/Ph42hf1YTLr6DtOY5RDKR5eXJUeLLvdDTbC53ULxj5XtpJ8Q7F2NXlYRt0QaLx4/o+xSltxIeNGMoPKuh8U8lxN9aWzX4nZUKROVzXdLmbGnG2PD1vv0615k7LJo/R3mbysdpkJlG3U82a5iOwMcgyT6vivlle/JkYSW2BXi0Y6kTnS5Wu0KXMgXY1OBsAie568Rwe0yX5aENA9y1au8M8zBFcugArazCeUN8mxd9xJGk8RsOP5X/hcq3od022usxkI4anEKpGGkLUkfqREasy9uG8UvWVJqsuvZOyFsYH1KNP/QxaTDZEdSLjIt3EfKsrDd+NG+4Nbi2On0ZaLfRFIeG4a34Q+9o/+9uxfyRH1wjsufQF/qpsbanmdMneJxjh/+3jvkqHsBir4N/7uiRbHGnVcLqfqyMpNFwESilNL2lSOhJHSrXOI7sl2aP+em4RQB Wx3R5H8L Tud5O1OGxeDbGN9yvSgRykOSrIBEAthWGmk1QyoBD8meBFbdFVrJvzNxw/aMz6EFLmGEDxWiDt2t7peDV35wOTOU8ekQYvjGXwg5n1GCsUdPaLZnz/HjsxPqCGd5FfuvVLfdqCF5Sxf259FvrnBZTI8A2S4sixcdoSFAzy0O1LXALuHUe/3y9axnBnyK/SSkiosCyyBdJ9ty4V7RaZLAOn//nWVmne2FbgT6OQlYO4PbGBh5TDD3n1DBcOLkqziqURa2pHWgdodajMgk2OP5nNeuo+KC0YtNRepYSCJLk4Yy1XVfhxF0v7jQNJW9aRUYrcbOX3G2LeNmohZt5GNowCwMReOra7lWV0/IjidQP5qJjateH80mIpJ0vOmDwsfRsw0YEqvIOqj9ccCGh+RuT2nW0rNpL4m64F+k4MJweZxQVSgk= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Ran Xiaokai This patchset fixes two issues in testing/selftests/cgroup/test_kmem.c that cause false test failures under certain system configurations. Patch 1/2 updates the MAX_VMSTAT_ERROR tolerance to account for the multi-memcg percpu charge cache introduced by commit f735eebe55f8 ("memcg: multi-memcg percpu charge cache") with NR_MEMCG_STOCK (currently 7) slots per CPU, the worst-case discrepancy between memory.current and memory.stat.percpu has increased. Patch 2/2 fixes the test_percpu_basic test to account for slab memory overhead. On systems with few CPUs (<= 4), slab consumption exceeds percpu usage, causing the test to fail even when the percpu accounting is working correctly. Ran Xiaokai (2): kselftests: cgroup: update kmem test tolerance for multi-memcg stock kselftests: cgroup: account for slab memory in test_percpu_basic tools/testing/selftests/cgroup/test_kmem.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) -- 2.25.1