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GET /api/patches/2220087/?format=api
{ "id": 2220087, "url": "http://patchwork.ozlabs.org/api/patches/2220087/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/9c395e89454325ac8a3f93f191e5238214103551.1775466329.git.sayalip@linux.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<9c395e89454325ac8a3f93f191e5238214103551.1775466329.git.sayalip@linux.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/9c395e89454325ac8a3f93f191e5238214103551.1775466329.git.sayalip@linux.ibm.com/", "date": "2026-04-06T09:19:24", "name": "[v4,05/15] selftests/mm: fix cgroup task placement and drop memory.current checks in hugetlb_reparenting_test.sh", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "577619e335ac1ae9216d46d0f341adaca2561c82", "submitter": { "id": 92656, "url": "http://patchwork.ozlabs.org/api/people/92656/?format=api", "name": "Sayali Patil", "email": "sayalip@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/9c395e89454325ac8a3f93f191e5238214103551.1775466329.git.sayalip@linux.ibm.com/mbox/", "series": [ { "id": 498833, "url": "http://patchwork.ozlabs.org/api/series/498833/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498833", "date": "2026-04-06T09:19:22", "name": "selftests/mm: fix failures and robustness improvements", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/498833/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220087/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220087/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19402-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=nWMmeEwC;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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lists.ozlabs.org;\n dmarc=pass (p=none dis=none) header.from=linux.ibm.com;\n dkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=nWMmeEwC; dkim-atps=neutral;\n spf=pass (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com;\n envelope-from=sayalip@linux.ibm.com;\n receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=02TqPKdDkja2MpVuM\n\tCfvhJ458T3TTNRCHN+YZuDZHV4=; b=nWMmeEwC4XC456PgD1gYYt4ejtHvvwFSD\n\tnQkVNZYCL5pYZkSyMqu+NFE5PnxBsX/CKE+Od6p9SuC/MdLyAA7YpS58vLhpqd3s\n\tJwOtLdLsJa0ZvST1ea5KM5o9rTBZa/uDfj78xZel3qhGDPaLDDWOcx7Myx+PGg4s\n\ty/ZovTlEg5YxN9FQjMAIZmYsFHW/+v7BXHEQC9DA9DL3lyk6x7c7FucMgRs1ncu6\n\t+tv8I9CLfx3j/omeWPbCNFfy0cDqG+MFVGhh+ptIoRyWrscj32eH8BA2LU2foRPc\n\t4iu0rHhFX4idgEAxKzgtTaO+4/bOldwzLD0jwl95/ZwVfJB32g6lw==", "From": "Sayali Patil <sayalip@linux.ibm.com>", "To": "Andrew Morton <akpm@linux-foundation.org>, Shuah Khan <shuah@kernel.org>,\n linux-mm@kvack.org, linux-kernel@vger.kernel.org,\n linux-kselftest@vger.kernel.org,\n Ritesh Harjani <ritesh.list@gmail.com>", "Cc": "David Hildenbrand <david@kernel.org>, Zi Yan <ziy@nvidia.com>,\n Michal Hocko <mhocko@kernel.org>, Oscar Salvador <osalvador@suse.de>,\n Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,\n Dev Jain <dev.jain@arm.com>, Liam.Howlett@oracle.com,\n linuxppc-dev@lists.ozlabs.org, Miaohe Lin <linmiaohe@huawei.com>,\n Venkat Rao Bagalkote <venkat88@linux.ibm.com>,\n Sayali Patil <sayalip@linux.ibm.com>", "Subject": "[PATCH v4 05/15] selftests/mm: fix cgroup task placement and drop\n memory.current checks in hugetlb_reparenting_test.sh", "Date": "Mon, 6 Apr 2026 14:49:24 +0530", "Message-ID": "\n <9c395e89454325ac8a3f93f191e5238214103551.1775466329.git.sayalip@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<cover.1775466329.git.sayalip@linux.ibm.com>", "References": "<cover.1775466329.git.sayalip@linux.ibm.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Proofpoint-Reinject": "loops=2 maxloops=12", "X-Proofpoint-GUID": "XsY-ZtQhlx9BN500-tgNidd91_t8gsDr", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDA2MDA5MCBTYWx0ZWRfX7ThhIelpwuLz\n ytrnXuZ9c2L6NXvWwzrjFzlgVqi6boKVUllyPHnbzSKcmCDBWhvHgPLhh+BB1i9YMtFNBVcIpdh\n 8b8jE9A806hHhGlwlknSwJRKCr/KihU1DrjRgjCh3lJPeX2+ebUdS2L2KH5zkU5due2KGWmrcWY\n k0NDe2mqpEXoXmUaU6oMjaMIocdStzVvsurTOLWKIAvUcGuwvpeIOZhoOkD2iZ4dKJ1fK+ziJXs\n CVlAI8aCvuHX2OmYKwjKqjGMo8UeJ2KNsCa2nVLXOBitV2nwg4KktILuElKnD8jASIpBoi+H7Uk\n pI2NUUaQieMjI1UurzOKOpFQqfvC1CmY8s9tndU/K7eyw1gzwFvd2GJnLtsK1aTBJ6KjZT4+WEC\n xtz15vSkAHdOLs+CcYIL/4LGABzSlK75ww5pXY+oeFH5eRPlnHXEgK/LFj1Dvl3CqyRwtylCJrr\n 70iB61rJhTTp7IF0Gyw==", "X-Authority-Analysis": "v=2.4 cv=b+u/I9Gx c=1 sm=1 tr=0 ts=69d37ac7 cx=c_pps\n a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VnNF1IyMAAAA:8 a=8tHZRRs_kCUVPtXYaVMA:9\n a=O8hF6Hzn-FEA:10", "X-Proofpoint-ORIG-GUID": "MoOBKZyzIcJoG71OrRn6y-5oOM0A1wyO", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-06_02,2026-04-03_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n suspectscore=0 phishscore=0 bulkscore=0 adultscore=0 lowpriorityscore=0\n impostorscore=0 malwarescore=0 spamscore=0 priorityscore=1501 clxscore=1015\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604060090", "X-Spam-Status": "No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "The test currently moves the calling shell ($$) into the target cgroup\nbefore executing write_to_hugetlbfs. This results in the shell and any\nintermediate allocations being charged to the cgroup, introducing noise\nand nondeterminism in accounting. It also requires moving the shell back\nto the root cgroup after execution.\n\nSpawn a helper process that joins the target cgroup and\nexec()'s write_to_hugetlbfs. This ensures that only the workload is\naccounted to the cgroup and avoids unintended charging from the shell.\n\nThe test currently validates both hugetlb usage and memory.current.\nHowever, memory.current includes internal memcg allocations and\nper-CPU batched accounting (MEMCG_CHARGE_BATCH), which are not\nsynchronized and can vary across systems, leading to\nnon-deterministic results.\n\nSince hugetlb memory is accounted via hugetlb.<size>.current,\nmemory.current is not a reliable indicator here. Drop memory.current\nchecks and rely only on hugetlb controller statistics for stable\nand accurate validation.\n\nFixes: 29750f71a9b4 (\"hugetlb_cgroup: add hugetlb_cgroup reservation tests\")\nSigned-off-by: Sayali Patil <sayalip@linux.ibm.com>\n---\n .../selftests/mm/hugetlb_reparenting_test.sh | 41 ++++++++-----------\n 1 file changed, 17 insertions(+), 24 deletions(-)", "diff": "diff --git a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh b/tools/testing/selftests/mm/hugetlb_reparenting_test.sh\nindex 00f3f3cd8909..014201cb6427 100755\n--- a/tools/testing/selftests/mm/hugetlb_reparenting_test.sh\n+++ b/tools/testing/selftests/mm/hugetlb_reparenting_test.sh\n@@ -105,22 +105,17 @@ function assert_with_retry() {\n }\n \n function assert_state() {\n- local expected_a=\"$1\"\n- local expected_a_hugetlb=\"$2\"\n- local expected_b=\"\"\n+ local expected_a_hugetlb=\"$1\"\n local expected_b_hugetlb=\"\"\n \n- if [ ! -z ${3:-} ] && [ ! -z ${4:-} ]; then\n- expected_b=\"$3\"\n- expected_b_hugetlb=\"$4\"\n+ if [ ! -z ${2:-} ]; then\n+ expected_b_hugetlb=\"$2\"\n fi\n \n- assert_with_retry \"$CGROUP_ROOT/a/memory.$usage_file\" \"$expected_a\"\n assert_with_retry \\\n \t \"$CGROUP_ROOT/a/hugetlb.${MB_DISPLAY}${UNIT}.$usage_file\" \"$expected_a_hugetlb\"\n \n- if [[ -n \"$expected_b\" && -n \"$expected_b_hugetlb\" ]]; then\n- assert_with_retry \"$CGROUP_ROOT/a/b/memory.$usage_file\" \"$expected_b\"\n+ if [[ -n \"$expected_b_hugetlb\" ]]; then\n assert_with_retry \\\n \t \"$CGROUP_ROOT/a/b/hugetlb.${MB_DISPLAY}${UNIT}.$usage_file\" \"$expected_b_hugetlb\"\n fi\n@@ -154,18 +149,16 @@ write_hugetlbfs() {\n local size=\"$3\"\n \n if [[ $cgroup2 ]]; then\n- echo $$ >$CGROUP_ROOT/$cgroup/cgroup.procs\n+ cg_file=\"$CGROUP_ROOT/$cgroup/cgroup.procs\"\n else\n echo 0 >$CGROUP_ROOT/$cgroup/cpuset.mems\n echo 0 >$CGROUP_ROOT/$cgroup/cpuset.cpus\n- echo $$ >\"$CGROUP_ROOT/$cgroup/tasks\"\n- fi\n- ./write_to_hugetlbfs -p \"$path\" -s \"$size\" -m 0 -o\n- if [[ $cgroup2 ]]; then\n- echo $$ >$CGROUP_ROOT/cgroup.procs\n- else\n- echo $$ >\"$CGROUP_ROOT/tasks\"\n+ cg_file=\"$CGROUP_ROOT/$cgroup/tasks\"\n fi\n+\n+ # Spawn helper to join cgroup before exec to ensure correct cgroup accounting\n+ bash -c \"echo \\$\\$ > '$cg_file'; exec ./write_to_hugetlbfs -p '$path' -s '$size' -m 0 -o\" & pid=$!\n+ wait \"$pid\"\n echo\n }\n \n@@ -203,21 +196,21 @@ if [[ ! $cgroup2 ]]; then\n write_hugetlbfs a \"$MNT\"/test $size\n \n echo Assert memory charged correctly for parent use.\n- assert_state 0 $size 0 0\n+ assert_state $size 0\n \n write_hugetlbfs a/b \"$MNT\"/test2 $size\n \n echo Assert memory charged correctly for child use.\n- assert_state 0 $(($size * 2)) 0 $size\n+ assert_state $(($size * 2)) $size\n \n rmdir \"$CGROUP_ROOT\"/a/b\n echo Assert memory reparent correctly.\n- assert_state 0 $(($size * 2))\n+ assert_state $(($size * 2))\n \n rm -rf \"$MNT\"/*\n umount \"$MNT\"\n echo Assert memory uncharged correctly.\n- assert_state 0 0\n+ assert_state 0\n \n cleanup\n fi\n@@ -231,16 +224,16 @@ echo write\n write_hugetlbfs a/b \"$MNT\"/test2 $size\n \n echo Assert memory charged correctly for child only use.\n-assert_state 0 $(($size)) 0 $size\n+assert_state $(($size)) $size\n \n rmdir \"$CGROUP_ROOT\"/a/b\n echo Assert memory reparent correctly.\n-assert_state 0 $size\n+assert_state $size\n \n rm -rf \"$MNT\"/*\n umount \"$MNT\"\n echo Assert memory uncharged correctly.\n-assert_state 0 0\n+assert_state 0\n \n cleanup\n \n", "prefixes": [ "v4", "05/15" ] }