From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C771C28002B for ; Fri, 1 May 2026 12:35:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777638947; cv=none; b=EbkV1XqFeFmabCVVQV8a1N6jKhqlH97AJANLA2iZNGa/6IDb5zpm2A/4Pf8G2ZVQG5axUohwikjs3ZWr31D7fBdKJJSLVVAIgU/9F+b/+AR0vLDjlLZABTQxLTUiZqRJS8ALLp2rf2trUMuqFwuyDPn+Lu7S62SuENXV4aRlBVY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777638947; c=relaxed/simple; bh=j+92rW7NjUUsbjZr1laAgX2gTxDTfwM/iDXhKJL51Qo=; h=Date:To:From:Subject:Message-Id; b=T8TvGMafpiNcvdj1OWQS260sEbKmre8OPm52lH9Uu0e+3Pk+w3uHGiKB/+dzSfa+RNyCcZ1o5TnNgpKQXQpPmejLAY8L752t0DZ0tO+BIWQ4ABXyEpH21WERK6keNh94i+2u5hYPaJ+vuS2IHjtmWF02TLAps2jn+aiBF/gxD5Q= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=glAk2rSm; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="glAk2rSm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 779FCC2BCB4; Fri, 1 May 2026 12:35:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777638947; bh=j+92rW7NjUUsbjZr1laAgX2gTxDTfwM/iDXhKJL51Qo=; h=Date:To:From:Subject:From; b=glAk2rSmJx2+tvnDyMka5Wkz0lrWfwUv43aQyLHbS/upib6lbQkWeF+r28lR8OYgE CI4EO5pk2D1LdkKprU+CEU2ZkmuCJyrHibLan49I89l2zYZIb+VE54zBDU/dUV5tx5 dMo2Qq8fcuJuyw1uSSx+IC1lQB6owdbJ0MyyVokg= Date: Fri, 01 May 2026 05:35:46 -0700 To: mm-commits@vger.kernel.org,vbabka@suse.cz,tj@kernel.org,shakeelb@google.com,mhocko@kernel.org,longman@redhat.com,hannes@cmpxchg.org,cl@linux.com,li.wang@linux.dev,akpm@linux-foundation.org From: Andrew Morton Subject: + selftests-cgroup-fix-hardcoded-page-size-in-test_percpu_basic.patch added to mm-new branch Message-Id: <20260501123547.779FCC2BCB4@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: selftests/cgroup: fix hardcoded page size in test_percpu_basic has been added to the -mm mm-new branch. Its filename is selftests-cgroup-fix-hardcoded-page-size-in-test_percpu_basic.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-cgroup-fix-hardcoded-page-size-in-test_percpu_basic.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Li Wang Subject: selftests/cgroup: fix hardcoded page size in test_percpu_basic Date: Fri, 1 May 2026 10:20:57 +0800 Patch series "selftests/cgroup: Fix false positive failures in test_percpu_basic", v2. This patch series addresses two separate issues that cause false positive failures in the test_percpu_basic test within the cgroup kmem selftests. The first issue stems from a hardcoded assumption about the system page size, which breaks the test on architectures with larger page sizes. The second issue is an overly strict memory check that fails to account for the slab metadata allocated during cgroup creation. Thi patch (of 2): MAX_VMSTAT_ERROR uses a hardcoded page size of 4096, which assumes 4K pages. This causes test_percpu_basic to fail on systems where the kernel is configured with a larger page size, such as aarch64 systems using 16K or 64K pages, where the maximum permissible discrepancy between memory.current and percpu charges is proportionally larger. Replace the hardcoded 4096 with sysconf(_SC_PAGESIZE) to correctly derive the page size at runtime regardless of the underlying architecture or kernel configuration. Link: https://lore.kernel.org/20260501022058.18024-1-li.wang@linux.dev Link: https://lore.kernel.org/20260501022058.18024-2-li.wang@linux.dev Signed-off-by: Li Wang Acked-by: Waiman Long Cc: Christoph Lameter Cc: Johannes Weiner Cc: Michal Hocko Cc: Shakeel Butt Cc: Tejun Heo Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- tools/testing/selftests/cgroup/test_kmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/tools/testing/selftests/cgroup/test_kmem.c~selftests-cgroup-fix-hardcoded-page-size-in-test_percpu_basic +++ a/tools/testing/selftests/cgroup/test_kmem.c @@ -24,7 +24,7 @@ * the maximum discrepancy between charge and vmstat entries is number * of cpus multiplied by 64 pages. */ -#define MAX_VMSTAT_ERROR (4096 * 64 * get_nprocs()) +#define MAX_VMSTAT_ERROR (sysconf(_SC_PAGESIZE) * 64 * get_nprocs()) #define KMEM_DEAD_WAIT_RETRIES 80 _ Patches currently in -mm which might be from li.wang@linux.dev are selftests-cgroup-skip-test_zswap-if-zswap-is-globally-disabled.patch selftests-cgroup-avoid-oom-in-test_swapin_nozswap.patch selftests-cgroup-use-runtime-page-size-for-zswpin-check.patch selftests-cgroup-rename-page_size-to-buf_size-in-cgroup_util.patch selftests-cgroup-replace-hardcoded-page-size-values-in-test_zswap.patch selftest-cgroup-fix-zswap-test_no_invasive_cgroup_shrink-on-large-pagesize-system.patch selftest-cgroup-fix-zswap-attempt_writeback-on-64k-pagesize-system.patch selftests-cgroup-test_zswap-wait-for-asynchronous-writeback.patch selftests-cgroup-fix-hardcoded-page-size-in-test_percpu_basic.patch selftests-cgroup-include-slab-in-test_percpu_basic-memory-check.patch