From nobody Mon Feb 9 14:14:20 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 AA7462F60A1 for ; Sun, 21 Dec 2025 12:27:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766320024; cv=none; b=m4nUmaU0sUnR0U8E4p4kOGOlWbSpUew9Zlhn0U9PR7acpSvriIMbbophEzFYWK0ehUlkEpHzWXWrs1tRmNdkU9B6QgYqCcVMSw3SQ2y0E4l1MyrWJ2Sb2b5D9BhVUJ5VUVcqz99xSWFUNA02DJZkMG5rCvFgeMkegHD2c6iKgEo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766320024; c=relaxed/simple; bh=UuDxqO4f80509EtE3sAw4GydzCwNOF1wxRxxWysFaPk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rNl1nLSEx+KPyOdgdgosFzHYS3/Lq3X+jzdHbinvEgplB7F9Mv3pS5nT1gBGAZR2l3XoH4j0pHKDm77BkJBek5kaC9odiMDEE2uOlEY7dI0V7Z5QjpS91xcfFvp+Y79ewHA0hlQlkIfA5Y0Yu+rUkzAoexHPxvznxjtj8jjxJlM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=FkIG4Kkj; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="FkIG4Kkj" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1766320020; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=zzPxgBwMBIOV5Pem2xEekXV9hInqKLJADfIWievTtPI=; b=FkIG4KkjAKsh2oC6ed5i9Dw6xiDewA35pvEKTSODNqiD4Ptm0hi6QBi4WgRxHxYQZmaNsB pyf9w5A7RvoaNAj/30G6eOH59Z+7ZQKJLmDgzOOPVO+9j1DnBf13qaEjZLsOX+ZZpIpyTc 71j5vR8llayoIoFm96p7WatQhn995FY= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-622-ji7ZnnHKOGe1JeQVEFtGFw-1; Sun, 21 Dec 2025 07:26:57 -0500 X-MC-Unique: ji7ZnnHKOGe1JeQVEFtGFw-1 X-Mimecast-MFC-AGG-ID: ji7ZnnHKOGe1JeQVEFtGFw_1766320016 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B83F41800343; Sun, 21 Dec 2025 12:26:55 +0000 (UTC) Received: from dell-per7425-02.rhts.eng.pek2.redhat.com (dell-per7425-02.rhts.eng.pek2.redhat.com [10.73.116.18]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2CCA319560B4; Sun, 21 Dec 2025 12:26:51 +0000 (UTC) From: Li Wang To: akpm@linux-foundation.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: David Hildenbrand , Mark Brown , Shuah Khan , Waiman Long Subject: [PATCH v3 2/3] selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs Date: Sun, 21 Dec 2025 20:26:38 +0800 Message-ID: <20251221122639.3168038-3-liwang@redhat.com> In-Reply-To: <20251221122639.3168038-1-liwang@redhat.com> References: <20251221122639.3168038-1-liwang@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" charge_reserved_hugetlb.sh mounts a hugetlbfs instance at /mnt/huge with a fixed size of 256M. On systems with large base hugepages (e.g. 512MB), this is smaller than a single hugepage, so the hugetlbfs mount ends up with zero capacity (often visible as size=3D0 in mount output). As a result, write_to_hugetlbfs fails with ENOMEM and the test can hang waiting for progress. --- Error log --- # uname -r 6.12.0-xxx.el10.aarch64+64k #./charge_reserved_hugetlb.sh -cgroup-v2 # ----------------------------------------- ... # nr hugepages =3D 10 # writing cgroup limit: 5368709120 # writing reseravation limit: 5368709120 ... # write_to_hugetlbfs: Error mapping the file: Cannot allocate memory # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 ... # mount |grep /mnt/huge none on /mnt/huge type hugetlbfs (rw,relatime,seclabel,pagesize=3D512M,si= ze=3D0) # grep -i huge /proc/meminfo ... HugePages_Total: 10 HugePages_Free: 10 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 524288 kB Hugetlb: 5242880 kB Drop the mount args with 'size=3D256M', so the filesystem capacity is suffi= cient regardless of HugeTLB page size. Fixes: 29750f71a9 ("hugetlb_cgroup: add hugetlb_cgroup reservation tests") Signed-off-by: Li Wang Cc: David Hildenbrand Cc: Mark Brown Cc: Shuah Khan Cc: Waiman Long --- tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/= testing/selftests/mm/charge_reserved_hugetlb.sh index e1fe16bcbbe8..fa6713892d82 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -290,7 +290,7 @@ function run_test() { setup_cgroup "hugetlb_cgroup_test" "$cgroup_limit" "$reservation_limit" =20 mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=3D${MB}M,size=3D256M none /mnt/huge + mount -t hugetlbfs -o pagesize=3D${MB}M none /mnt/huge =20 write_hugetlbfs_and_get_usage "hugetlb_cgroup_test" "$size" "$populate" \ "$write" "/mnt/huge/test" "$method" "$private" "$expect_failure" \ @@ -344,7 +344,7 @@ function run_multiple_cgroup_test() { setup_cgroup "hugetlb_cgroup_test2" "$cgroup_limit2" "$reservation_limit= 2" =20 mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=3D${MB}M,size=3D256M none /mnt/huge + mount -t hugetlbfs -o pagesize=3D${MB}M none /mnt/huge =20 write_hugetlbfs_and_get_usage "hugetlb_cgroup_test1" "$size1" \ "$populate1" "$write1" "/mnt/huge/test1" "$method" "$private" \ --=20 2.49.0