From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from AS8PR04CU009.outbound.protection.outlook.com (mail-westeuropeazon11011012.outbound.protection.outlook.com [52.101.70.12]) (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 B0DD93AB284; Mon, 4 May 2026 12:21:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.70.12 ARC-Seal:i=3; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777897289; cv=fail; b=o6zzf4MO44f9M0IzvD+su1DsrgBF+dO8AGFjbVzcAKsq62jn7Fyg2drOoctUEoY6XgFkalgZWIb36bv6urfBjNUXM3kAvRjFzEiWlbNbSkzeVpan/oWBDOKBfjkDHkll+X03QPB7RJzqjceMh/Kp7C6B90dIhD4BZHP6jEfMTMw= ARC-Message-Signature:i=3; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777897289; c=relaxed/simple; bh=UtL+WLA/g38qG4PZxfuhzCdG8KwHJIgNhD23Rm4gXhE=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=ab6ddDnUHIlZeTg05qPZcXd/xW9dCag3uBCEAnPYX19wd3dWrFhDVX0Fynr+RDbDNIdFhsPz5l7rr9GBa6ANc1ZVC9RxCHFDua7oCGwbUNazUMp2WvgE2ckHk7qvk1ki7MWNuKstaMfFLdZs9/WjRSZHlDA4cB2XTkH+M3UT2ig= ARC-Authentication-Results:i=3; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=VX9/rggr; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=VX9/rggr; arc=fail smtp.client-ip=52.101.70.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="VX9/rggr"; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="VX9/rggr" ARC-Seal: i=2; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=pass; b=WBpK19cAXYSVYX8c0vsYQ7APnXg18y/SWpoh3rLo5CQEUfi9YeQPlge8sn8aN2jy3U7oLigGrq6wDiak9gFh76bNrHryUD2rX88r2q1lUYWXhoK+Ro8h6Cpqse6YIjFjweECvG+Kyn0kGqblEmuAE6sbSJTkhAkeU4Hw9CdxMAJ6hue2DV43756480CR3Xmz8BHW0ypcOMWkupikVi9l94n6d9PJiPtrhCPRLr36f4lkMilRfS6YxekFKWcC7xVhiEBPxyDrilY5b3IrUsa0qyM0hcXGSRD/vADdY4/PE3bZ6aX/ubMHgsgiJOuAePCMWARhvxKladBHxLmtBSmOMQ== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=MsfL030AlBVO55RJBCiu6tC8HTDeZlNSzlJ1nTAELB4=; b=Dz5I7fp7qcMxucKVZROiRqFf7WBIuBjsMCoIVrSPNQMaMjam3ZHyYmiXSy2yG0JbF13iYyS7HaaGg+k8qArghzoQ9SKLUtzuYTpM2rfPX8pGjvAjcYhMEXa00z2MBNToULwtEOQVOlBB7jr8redau7dyxtoR3ZvuXiQCAWWyR1AFKMoI1LjFt/GYz9xnStvYStREINoqQ6EumU3HVC3YY8PfFFMK82thW/2e56aKmBscyTIKpOkGzYUqbIkoNZI/7MAbY30jhKoBYhftbtkBJ52vTx5mPaCLwCz4nmPemuhVgG3qK0z3ea9aOwGS/Vr3Ad4bYH9pIoXQ9G4D3N1QaA== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 4.158.2.129) smtp.rcpttodomain=kernel.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=pass (signature was verified) header.d=arm.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=arm.com] dkim=[1,1,header.d=arm.com] dmarc=[1,1,header.from=arm.com]) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MsfL030AlBVO55RJBCiu6tC8HTDeZlNSzlJ1nTAELB4=; b=VX9/rggrlS8BQTQFfQQ1OGhOd3wfsHb619Q+0c/KTOdF34DCTcrS9bx5Bm4ux9/6armYeuzN/VKJ5juuAHuj3hJ5JCn3RAgRqlhW1pW/DfUdxS0UvzG+hOf1KjybUj/u/BQOf6p1/1MPodjKHdl+whKo+VviZlE5Ef3RnRZD7Yg= Received: from AS4P250CA0003.EURP250.PROD.OUTLOOK.COM (2603:10a6:20b:5df::19) by AS8PR08MB8899.eurprd08.prod.outlook.com (2603:10a6:20b:5b6::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9870.25; Mon, 4 May 2026 12:21:19 +0000 Received: from AMS1EPF00000047.eurprd04.prod.outlook.com (2603:10a6:20b:5df:cafe::f0) by AS4P250CA0003.outlook.office365.com (2603:10a6:20b:5df::19) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9870.25 via Frontend Transport; Mon, 4 May 2026 12:21:19 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 4.158.2.129) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=arm.com;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 4.158.2.129 as permitted sender) receiver=protection.outlook.com; client-ip=4.158.2.129; helo=outbound-uk1.az.dlp.m.darktrace.com; pr=C Received: from outbound-uk1.az.dlp.m.darktrace.com (4.158.2.129) by AMS1EPF00000047.mail.protection.outlook.com (10.167.16.135) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9891.9 via Frontend Transport; Mon, 4 May 2026 12:21:19 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=Lif5LgvgV70YReEPgPRaR0xpXi6meERLR/yCYjxRwp67Y5mtI0Ao6Smt1HQJ9bCP9p8KkJE93+V0vIhk871dW2MFK9GJfLMKQc9zLF7zLzmILYCspfvlzc/jYKvZoHmA5o3p6qrRheKFpmbYPo3kEnEFJKlhlMbBjQ9hqZuED6w7z9EQnYADrHjbBH7679SYtiQk/HuodvvMbE61i3MIm/y/KXpZyDUl5HgO+EtJf1d/PUtkE7dQCYoEDdkTj9Qym6i1k7VJ/beWg3B779CkoDgXjNzQJP4xDGKjdKoiGt0SF8VTvEwobOCDXQOIvgoGRFCotYC6jM/lJavm7FZwWw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=MsfL030AlBVO55RJBCiu6tC8HTDeZlNSzlJ1nTAELB4=; b=Ke3572OB+TStAd8m+Jbo+fnxaR/AIZI3ACqGiR7+oikCneZ1hF12p/ENtKpy1cXrFUHMaE2VM82uAsbhg/bVmkwv7USrDD03FHV9PeOqkdMuuW5sP1eryB/9GD3554JhanZWv6wy3M7Pq3HAKIpvsdMsOCriOHfIUxewswX4eu4KrpoEhB+n1R4BiKv97EdX5YFHcMHQdRnTFRO+6KgI2ecsdd2NWYxvBgc2Aohj8UsRp9ebUvWT4YNyz2inTYs3BxJCjU2hIXxGovWv4Pb0VryQoPSceUl0EvA05CaR7r9OSWRtYLAIRsaZ3Ci7yhk/SIMTCSGsv6jDqB+MRMJ/rg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=arm.com; dmarc=pass action=none header.from=arm.com; dkim=pass header.d=arm.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=arm.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MsfL030AlBVO55RJBCiu6tC8HTDeZlNSzlJ1nTAELB4=; b=VX9/rggrlS8BQTQFfQQ1OGhOd3wfsHb619Q+0c/KTOdF34DCTcrS9bx5Bm4ux9/6armYeuzN/VKJ5juuAHuj3hJ5JCn3RAgRqlhW1pW/DfUdxS0UvzG+hOf1KjybUj/u/BQOf6p1/1MPodjKHdl+whKo+VviZlE5Ef3RnRZD7Yg= Authentication-Results-Original: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=arm.com; Received: from DU0PR08MB9203.eurprd08.prod.outlook.com (2603:10a6:10:417::12) by PAWPR08MB11160.eurprd08.prod.outlook.com (2603:10a6:102:46e::9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9870.25; Mon, 4 May 2026 12:20:15 +0000 Received: from DU0PR08MB9203.eurprd08.prod.outlook.com ([fe80::f1e:73f2:57df:4047]) by DU0PR08MB9203.eurprd08.prod.outlook.com ([fe80::f1e:73f2:57df:4047%2]) with mapi id 15.20.9870.023; Mon, 4 May 2026 12:20:15 +0000 Message-ID: Date: Mon, 4 May 2026 17:50:06 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 35/54] selftests/mm: hugepage_dio: add setup of HugeTLB pages To: Mike Rapoport , Andrew Morton , David Hildenbrand Cc: Baolin Wang , Barry Song , Dev Jain , Donet Tom , Jason Gunthorpe , John Hubbard , "Liam R. Howlett" , Lance Yang , Leon Romanovsky , Lorenzo Stoakes , Luiz Capitulino , Mark Brown , Michal Hocko , Nico Pache , Peter Xu , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org References: <20260428204240.1924129-1-rppt@kernel.org> <20260428204240.1924129-36-rppt@kernel.org> From: Sarthak Sharma Content-Language: en-US In-Reply-To: <20260428204240.1924129-36-rppt@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MA5PR01CA0092.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a01:1a8::13) To DU0PR08MB9203.eurprd08.prod.outlook.com (2603:10a6:10:417::12) Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DU0PR08MB9203:EE_|PAWPR08MB11160:EE_|AMS1EPF00000047:EE_|AS8PR08MB8899:EE_ X-MS-Office365-Filtering-Correlation-Id: 67433d0e-ed7e-4ced-c296-08dea9d7a5aa x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|56012099003|22082099003|18002099003; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DU0PR08MB9203.eurprd08.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014)(56012099003)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-Exchange-RoutingPolicyChecked: QrIfQcJoSGrjazhd4KR7T9wnp3aw8FTQ7fzz91qHkTerhrdgrDtIJFSYYVONIaSxl4B+Yx1m0jxgkww1zrhE7t6oQZvqMydRQecGFQgl606QX+fQ/P/de7+2Jnhq08U/+PcbRRBT3Tu3BWlm5jSrHoDAV/I5qwV2PBLoGCVtHyGiey2hmmu3E6geVa8GknOfTtJTbTYbXr/+UBweZZAood724XxZjOlRNIGflKTEdlQIkyWoAgb30QcRjGRaQ/ap2/Wzeeq+VqUcHlRM5PmGKzmDbYv9wazJDmrOpe34zfDG+3i7YIdfw0y6naqNK/kULEStFG/O3wdhZy/bztg1bw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR08MB11160 X-EOPAttributedMessage: 0 X-MS-Exchange-Transport-CrossTenantHeadersStripped: AMS1EPF00000047.eurprd04.prod.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: 8870618b-a76e-4491-c328-08dea9d77f1f X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|14060799003|1800799024|7416014|82310400026|35042699022|36860700016|22082099003|18002099003|56012099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:4.158.2.129;CTRY:GB;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:outbound-uk1.az.dlp.m.darktrace.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(14060799003)(1800799024)(7416014)(82310400026)(35042699022)(36860700016)(22082099003)(18002099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: PP8P4mHj4kYE7ZSFQ8Lp8Nesoli8KazIRtNBDkF4elK27m4VOhK33IyjPibi3eoyHSshY0AZCz8a/WNCkaN6KHkPoEmodLmc3yun5FVtyY6IGClxvAl2DRSbAWhG0UPh4Tc4dyjXTt2WNzWmOM1HhXAScVFtBJy+8+aj3S0Q8wuG3H8UOYWfn+2YiHv/s5bWr/4B0LHMNAraRxBDJXwd+I8jyjwJPTMvluIKyRQxspahFoOiohOEed9wox7CHM/mhbzJr/t9XKcU2L7cDU7Dvtl/BpFBY2s6C7vqXJCgaLyRCvS3z8uxnvgbwifOT7v/wqr0EB7/DQZUd/NDDFPWUwbKQgAaBASE1X7+1MxEXe8G992a2+gULnnrI/QFZ7oTqvdl6u8F98AC8xaTo41uciWzwDLTosZrHQYuFv7SMHBaikqVpo/p2iQMRdHAknv4 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 May 2026 12:21:19.4702 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 67433d0e-ed7e-4ced-c296-08dea9d7a5aa X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AMS1EPF00000047.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB8899 Hi Mike! On 4/29/26 2:12 AM, Mike Rapoport wrote: > From: "Mike Rapoport (Microsoft)" > > hugepage_dio test fails if there are no free huge pages prepared by a > wrapper script. > > Add setup of HugeTLB pages to the test and make sure that the original > settings are restored on the test exit. > > Signed-off-by: Mike Rapoport (Microsoft) > --- > tools/testing/selftests/mm/hugetlb_dio.c | 10 ++-------- > 1 file changed, 2 insertions(+), 8 deletions(-) > > diff --git a/tools/testing/selftests/mm/hugetlb_dio.c b/tools/testing/selftests/mm/hugetlb_dio.c > index 47019433ddaf..fb4600570e13 100644 > --- a/tools/testing/selftests/mm/hugetlb_dio.c > +++ b/tools/testing/selftests/mm/hugetlb_dio.c > @@ -85,8 +85,6 @@ static void run_dio_using_hugetlb(int fd, unsigned int start_off, > > /* Get the default huge page size */ > h_pagesize = default_huge_page_size(); > - if (!h_pagesize) > - ksft_exit_fail_msg("Unable to determine huge page size\n"); > > /* Reset file position since fd is shared across tests */ > if (lseek(fd, 0, SEEK_SET) < 0) > @@ -94,10 +92,6 @@ static void run_dio_using_hugetlb(int fd, unsigned int start_off, > > /* Get the free huge pages before allocation */ > free_hpage_b = hugetlb_free_default_pages(); > - if (free_hpage_b == 0) { > - close(fd); > - ksft_exit_skip("No free hugepage, exiting!\n"); > - } > > /* Allocate a hugetlb page */ > orig_buffer = mmap(NULL, h_pagesize, mmap_prot, mmap_flags, -1, 0); > @@ -141,8 +135,8 @@ int main(void) > > ksft_print_header(); > > - /* Check if huge pages are free */ > - if (!hugetlb_free_default_pages()) > + /* request a huge page */ > + if (!hugetlb_setup_default(1)) > ksft_exit_skip("No free hugepage, exiting\n"); Before applying the patch, I get the following output: TAP version 13 1..4 # No. Free pages before allocation : 112 # No. Free pages after munmap : 112 ok 1 free huge pages from 0-12288 # No. Free pages before allocation : 112 # No. Free pages after munmap : 112 ok 2 free huge pages from 0-10240 # No. Free pages before allocation : 112 # No. Free pages after munmap : 112 ok 3 free huge pages from 2048-12288 # No. Free pages before allocation : 112 # No. Free pages after munmap : 112 ok 4 free huge pages from 2048-14336 # Totals: pass:4 fail:0 xfail:0 xpass:0 skip:0 error:0 After applying the patch, I get this: TAP version 13 # [INFO] detected hugetlb page size: 2048 KiB # [INFO] detected hugetlb page size: 32768 KiB # [INFO] detected hugetlb page size: 64 KiB # [INFO] detected hugetlb page size: 1048576 KiB 1..0 # SKIP No free hugepage, exiting even when I have 112 free and 128 total hugepages of size 2MB (default for my system). Could it be because hugetlb_setup_default(1) here is trying to set the default hugetlb pool size to exactly 1, and then checking whether there is exactly 1 free hugepage, instead of simply checking whether at least 1 free hugepage is available? > > fd = open("/tmp", O_TMPFILE | O_RDWR | O_DIRECT, 0664);