{"id":2220084,"url":"http://patchwork.ozlabs.org/api/patches/2220084/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/8beb895ae46c3e817e80cdd5386933cdcf8e233f.1775466329.git.sayalip@linux.ibm.com/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/projects/2/?format=json","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":"<8beb895ae46c3e817e80cdd5386933cdcf8e233f.1775466329.git.sayalip@linux.ibm.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/8beb895ae46c3e817e80cdd5386933cdcf8e233f.1775466329.git.sayalip@linux.ibm.com/","date":"2026-04-06T09:19:20","name":"[v4,01/15] selftests/mm: restore default nr_hugepages value via EXIT trap in charge_reserved_hugetlb.sh","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"6a6d910d98ef1c1ef2afff5eb18cc746ce5705ca","submitter":{"id":92656,"url":"http://patchwork.ozlabs.org/api/people/92656/?format=json","name":"Sayali Patil","email":"sayalip@linux.ibm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/8beb895ae46c3e817e80cdd5386933cdcf8e233f.1775466329.git.sayalip@linux.ibm.com/mbox/","series":[{"id":498833,"url":"http://patchwork.ozlabs.org/api/series/498833/?format=json","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/2220084/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220084/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","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=AePv7Mh6;\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=AePv7Mh6; dkim-atps=neutral;\n spf=pass (client-ip=148.163.156.1; helo=mx0a-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=Gw+rjcKVM5h6GXjQf\n\tCYysJfzzPt4h5VbBFTgu6oDlxM=; b=AePv7Mh6wpi2Ed/SBNZJotX5rwyc0O+jF\n\tSAXfk9LfzF/c2OGiHrJOejx2ejRWqXITtv5AEm0xyQAO28r+nZmEsr1wSN9NNZwM\n\t8WByYFGgucrBIzac9VrEf78nNVcrR2jr+56RBFck+/9kIR0l+At2YXRCUORGoNEw\n\tw/L3XztUrez4u/9R1Id0BBoE2x5/B78qRsoIgsQ+BnYv030v1fRXZEgk6qIpB5+0\n\tgzvBNbAa/Hcowou+7NEM2uwRiv9L5mqhX+NLxCbQBg6eGX65kPP52vKE00vW6eqS\n\te7D98FLTJj1I43XFxrmlEKiVuiUdC0xEw0NSMHnUTk+eZdTDWvrGQ==","From":"Sayali Patil ","To":"Andrew Morton , Shuah Khan ,\n linux-mm@kvack.org, linux-kernel@vger.kernel.org,\n linux-kselftest@vger.kernel.org,\n Ritesh Harjani ","Cc":"David Hildenbrand , Zi Yan ,\n Michal Hocko , Oscar Salvador ,\n Lorenzo Stoakes ,\n Dev Jain , Liam.Howlett@oracle.com,\n linuxppc-dev@lists.ozlabs.org, Miaohe Lin ,\n Venkat Rao Bagalkote ,\n Sayali Patil ","Subject":"[PATCH v4 01/15] selftests/mm: restore default nr_hugepages value via\n EXIT trap in charge_reserved_hugetlb.sh","Date":"Mon, 6 Apr 2026 14:49:20 +0530","Message-ID":"\n <8beb895ae46c3e817e80cdd5386933cdcf8e233f.1775466329.git.sayalip@linux.ibm.com>","X-Mailer":"git-send-email 2.52.0","In-Reply-To":"","References":"","X-Mailing-List":"linuxppc-dev@lists.ozlabs.org","List-Id":"","List-Help":"","List-Owner":"","List-Post":"","List-Archive":",\n ","List-Subscribe":",\n ,\n ","List-Unsubscribe":"","Precedence":"list","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-TM-AS-GCONF":"00","X-Proofpoint-Reinject":"loops=2 maxloops=12","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDA2MDA5MCBTYWx0ZWRfXzyKLtulSDSth\n IFqReIpcfgL8hR7NqxmS2WDI6atp0Tuwnpsep9+D7WP5qLtCinM6WdACbnC2x7ZZgR/4Z9mpqbP\n upl/AOBOoEiCZyb33rW9p1as55zdcD6nUk0vuJsWgJ6U78oM0IULBQo1hPPUHawmgr2B0rUOn1h\n QqqvTCNv3d+tRb77WvDuPh/AqVxnA8D6oPBsNd4+p/wFa/mtiWv9UvMVGqqbm+DABCRgT01TdjP\n 9MBEN6AOsPnSRR+IHqw/1aXEGvOJSHKSbwAsK0hAkDVdzJ+4mvWIWk7nre7dHhoGRR/hL083x0n\n 2s1jdLxeEHgRbQZ1LUn6zzYheeBIBY/tBnAPmp8DanxWJavbaDkq2klA/IFelFNhhqSPEXezsxS\n s1xpsAKk0SBvswls3ZZTPIvXRUxqUw0ws+JjRw5SCxH0xbo940n0DYnAaW7pCy9MLvhwAGhpbK5\n K3zpVns/DplhG1DRvgw==","X-Proofpoint-GUID":"nK63GTggKdNRTYW7Z81LZfRvqmynf4OA","X-Proofpoint-ORIG-GUID":"J-QzRBArbcHki7t0X32IBjJIHzxx8zwY","X-Authority-Analysis":"v=2.4 cv=HJvO14tv c=1 sm=1 tr=0 ts=69d37ab7 cx=c_pps\n a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=C3DWCGp_6AllTJ2cH5YA:9","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 impostorscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 adultscore=0\n malwarescore=0 spamscore=0 phishscore=0 priorityscore=1501 bulkscore=0\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":"cleanup() resets nr_hugepages to 0 on every invocation, while the test\nreconfigures it again in the next iteration. This leads to repeated\nallocation and freeing of large numbers of hugepages, especially when\nthe original value is high.\n\nAdditionally, with set -e, failures in earlier cleanup steps (e.g.,\nrmdir or umount returning EBUSY while background activity is still\nongoing) can cause the script to exit before restoring the original\nvalue, leaving the system in a modified state.\n\nUse an EXIT trap to restore the original nr_hugepages once at\nscript termination. This avoids unnecessary allocation churn and\nensures the original value is reliably restored on all exit paths.\n\nFixes: 7d695b1c3695b (\"selftests/mm: save and restore nr_hugepages value\")\nSigned-off-by: Sayali Patil \n---\n tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 3 +--\n 1 file changed, 1 insertion(+), 2 deletions(-)","diff":"diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh\nindex 447769657634..ca33ec83ebf2 100755\n--- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh\n+++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh\n@@ -12,6 +12,7 @@ if [[ $(id -u) -ne 0 ]]; then\n fi\n \n nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)\n+trap 'echo \"$nr_hugepgs\" > /proc/sys/vm/nr_hugepages' EXIT\n \n fault_limit_file=limit_in_bytes\n reservation_limit_file=rsvd.limit_in_bytes\n@@ -65,7 +66,6 @@ function cleanup() {\n if [[ -e $cgroup_path/hugetlb_cgroup_test2 ]]; then\n rmdir $cgroup_path/hugetlb_cgroup_test2\n fi\n- echo 0 >/proc/sys/vm/nr_hugepages\n echo CLEANUP DONE\n }\n \n@@ -594,4 +594,3 @@ if [[ $do_umount ]]; then\n rmdir $cgroup_path\n fi\n \n-echo \"$nr_hugepgs\" > /proc/sys/vm/nr_hugepages\n","prefixes":["v4","01/15"]}