{"id":2232278,"url":"http://patchwork.ozlabs.org/api/patches/2232278/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/94e79f92aa370c2551cd909bc9ecc0cb8910492c.1777877814.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":"<94e79f92aa370c2551cd909bc9ecc0cb8910492c.1777877814.git.sayalip@linux.ibm.com>","list_archive_url":"https://lore.kernel.org/linuxppc-dev/94e79f92aa370c2551cd909bc9ecc0cb8910492c.1777877814.git.sayalip@linux.ibm.com/","date":"2026-05-04T08:24:38","name":"[v6,01/14] 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":"85fb2d71aa3b348e63cda3a09881636539c9ae8e","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/94e79f92aa370c2551cd909bc9ecc0cb8910492c.1777877814.git.sayalip@linux.ibm.com/mbox/","series":[{"id":502625,"url":"http://patchwork.ozlabs.org/api/series/502625/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502625","date":"2026-05-04T08:24:37","name":"selftests/mm: fix failures and robustness improvements","version":6,"mbox":"http://patchwork.ozlabs.org/series/502625/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2232278/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2232278/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=Ovj+vNNt;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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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\nIntroduce a trap on EXIT, INT, and TERM to restore the original\nnr_hugepages value once at script termination. This avoids\nunnecessary allocation churn and ensures the original value\nis reliably restored on all exit paths.\n\nFixes: 7d695b1c3695b (\"selftests/mm: save and restore nr_hugepages value\")\nAcked-by: Zi Yan \nTested-by: Venkat Rao Bagalkote \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 44f4e703deb9..e1945901fd20 100755\n--- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh\n+++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh\n@@ -17,6 +17,7 @@ if ! command -v killall >/dev/null 2>&1; then\n fi\n \n nr_hugepgs=$(cat /proc/sys/vm/nr_hugepages)\n+trap 'echo \"$nr_hugepgs\" > /proc/sys/vm/nr_hugepages' EXIT INT TERM\n \n fault_limit_file=limit_in_bytes\n reservation_limit_file=rsvd.limit_in_bytes\n@@ -70,7 +71,6 @@ 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@@ -599,4 +599,3 @@ if [[ $do_umount ]]; then\n rmdir $cgroup_path\n fi\n \n-echo \"$nr_hugepgs\" > /proc/sys/vm/nr_hugepages\n","prefixes":["v6","01/14"]}