From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3992CD41D74 for ; Mon, 15 Dec 2025 08:47:54 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6FEBB6B0008; Mon, 15 Dec 2025 03:47:53 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 6D6626B000A; Mon, 15 Dec 2025 03:47:53 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5C5126B000C; Mon, 15 Dec 2025 03:47:53 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 4CFCB6B0008 for ; Mon, 15 Dec 2025 03:47:53 -0500 (EST) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 093B3160EA2 for ; Mon, 15 Dec 2025 08:47:53 +0000 (UTC) X-FDA: 84221077626.10.B8EB21C Received: from BL0PR03CU003.outbound.protection.outlook.com (mail-eastusazon11012012.outbound.protection.outlook.com [52.101.53.12]) by imf02.hostedemail.com (Postfix) with ESMTP id 28DCE8000B for ; Mon, 15 Dec 2025 08:47:50 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=DEUhDXXn; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf02.hostedemail.com: domain of shivankg@amd.com designates 52.101.53.12 as permitted sender) smtp.mailfrom=shivankg@amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1765788470; a=rsa-sha256; cv=pass; b=TT8lw/GAfigQoeAKao8mdkuThyrV0g/1obn1zOQWK9dVkD2PTXnGRdGDRryoie5jOQVhDD 3Ki5qkuN0ZCf3xekbaM1676PR3szetcDFWBhJZxMoyFHI7D0+u8PybOICJUKp7dg6JVUA7 9dQqarj6+CCg4tpm+1PsdrFiJPsHSz4= ARC-Authentication-Results: i=2; imf02.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=DEUhDXXn; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf02.hostedemail.com: domain of shivankg@amd.com designates 52.101.53.12 as permitted sender) smtp.mailfrom=shivankg@amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1765788470; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PWwrLB9amy9Jf/FSPwAn12dKpNXOoV6wl75rDRmX8hE=; b=PdH5G7NLVP4PGRQYyuRccXjDbxPelMbDMnYi2H1OQ5dL/fALs6ly/ckZNFMIIRlDDwsh74 O8WGQo2E/PopCJG5nLsKQin1fB8vp9Qsd586GZhXHKPFOaWo7carg/ySm4IYZI/bv3E48i 8MmDXgsqzoXQiwAVMk6jz5PG4tTnwTs= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=TgSrCVWOnsuCEGTqPpFXSfZN/hv38w0oDV9Apf6axWB2UmbK5JOrCQntVIm3IPFAUDhOIptlk84wxcqHQl3JP33u2gTTQtHTQwGGd4xMNqNfoC4eDfRpnori5z/YpkUpxmk+heCEV8+cndf/PZOfA5mSSINJCrevu+NAKerHe78XSVxsNomMfFlCq9XOppWkbhjLSq2r3c3qf+fgxRg+/gjgBOCFHds/uzrDqCx9VWNSAMLAP571BEieMzD9ocTxXC7dF106hKdfAWcnTEefQrBxEoo4LaBePGxWJJwl1qPGpp6VneUeviXf+5mozoI1o55L7+9OfkHGAOHQq/2A/Q== 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=PWwrLB9amy9Jf/FSPwAn12dKpNXOoV6wl75rDRmX8hE=; b=ps5xLFthE+TWRba5xoXlnMcLQ+98fCIDZIrPNTXM74jmVMukuRa2X3OONG+M2l3lqltURLEWInhMCzf9dMhklJUmzewPZy+KNx/xv87D3ZuHyKJ0JLOW17SJgHlpYsbyr6JtRUtytM9AKRRyKseTwAM83qy82K1+4xOlej1ayvgpzTbfvGyy6CmYl269bVq0twN+ulXgTkBUN+0t9Z9s4EznVYxyjPsciBmQ1IcQaJYqn4yqhyVWn80ympqgqdwCAjwTxyFcflo6Rb5jWv+40rgEw3peZB6syN/gDtQlGydChdWYSf+MfJPLkKkladtBzRTZMJCiyUscG1b4DjmZsg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=linux-foundation.org smtp.mailfrom=amd.com; dmarc=pass (p=quarantine sp=quarantine pct=100) action=none header.from=amd.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=PWwrLB9amy9Jf/FSPwAn12dKpNXOoV6wl75rDRmX8hE=; b=DEUhDXXnm0iDIZz5uUwKxI9Oat7iwhHnNzmciuB4cap53gViWeZuec1QJQbodGqc0/PsE2RQYXzvGUo9qj/jNc2suS0op7ESIGGCy9M4DliP8Y5e017kyWWr/Cer890Ncjz9+4WMao05lHv5gh8sPPX0+5nhDMtqFHiXlyaE+Ec= Received: from SJ0PR03CA0024.namprd03.prod.outlook.com (2603:10b6:a03:33a::29) by IA1PR12MB9738.namprd12.prod.outlook.com (2603:10b6:208:465::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9412.7; Mon, 15 Dec 2025 08:47:47 +0000 Received: from SJ5PEPF000001D2.namprd05.prod.outlook.com (2603:10b6:a03:33a:cafe::ca) by SJ0PR03CA0024.outlook.office365.com (2603:10b6:a03:33a::29) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9388.15 via Frontend Transport; Mon, 15 Dec 2025 08:47:47 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=satlexmb07.amd.com; pr=C Received: from satlexmb07.amd.com (165.204.84.17) by SJ5PEPF000001D2.mail.protection.outlook.com (10.167.242.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9434.6 via Frontend Transport; Mon, 15 Dec 2025 08:47:46 +0000 Received: from kaveri.amd.com (10.180.168.240) by satlexmb07.amd.com (10.181.42.216) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.17; Mon, 15 Dec 2025 02:47:41 -0600 From: Shivank Garg To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes CC: Zi Yan , Baolin Wang , "Liam R . Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Steven Rostedt , Masami Hiramatsu , "Mathieu Desnoyers" , Zach O'Keefe , , , , , Branden Moore , wang lian Subject: [PATCH V4 1/2] mm/khugepaged: map dirty/writeback pages failures to EAGAIN Date: Mon, 15 Dec 2025 08:46:17 +0000 Message-ID: <20251215084615.5283-5-shivankg@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251215084615.5283-3-shivankg@amd.com> References: <20251215084615.5283-3-shivankg@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ5PEPF000001D2:EE_|IA1PR12MB9738:EE_ X-MS-Office365-Filtering-Correlation-Id: 109f7568-8e65-4bfe-9ec0-08de3bb69ef0 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024|13003099007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?E4AUwYqcoxYe1ACX3jKzw+0inOcjalNdf8R6aVSA8SMiAcdTeQI8bfhEdDzo?= =?us-ascii?Q?4c0P9MS+1qy6rfKRgSdzeVNVmgvZpEDbY4PoMgijJyK92O9YDTDIcsZDkNPm?= =?us-ascii?Q?R4Xar1/iapDyOw8G4uF93ZH/RnriVL5vSCPZWXKMvQv2kOIs0V+8+r7pXPBc?= =?us-ascii?Q?6PE1fw647HfP/STKQlOKn/rjxDiPDSriPk7QrrOCQlncTIzzQQDBmqWbWwwW?= =?us-ascii?Q?M9wnCTmYAEVxGC8TYn8ui8Volc7t1MIHfMqB+SrGhhAa75ZxGCbVYKVuRE2+?= =?us-ascii?Q?YZeFLwdRIHs11xHk3UqSiR1PLOqumR+euz2JAnlSXwqcMsaFsnzeGgFI3ef/?= =?us-ascii?Q?bL67nWjRmNI+ymRbEkvRYyBIkQU52ZQE6rEBl+N5Z+r7uRf/i52G5XYdRpy3?= =?us-ascii?Q?+rSgJ7Q8uiqitr9mRvrHNwfWCL8r82YEQgak7KPXLXqVV9cy1+Dvw0VvPdDp?= =?us-ascii?Q?h/SYZOQImmOh/7I76rUa08QXZLnwdsr94EpI5mSGKNiBA6yThHba717Y5MST?= =?us-ascii?Q?+cunxsSk+277nuYdSZBlKRlltHLIT//uzytMbhfMBBLHzzafngEvlaVcOlR6?= =?us-ascii?Q?DMa24sEdMzcrfj7JcaYi7jZVZfiD/owBTeKofefj7ilqVZYCHmL6tPe2a7xT?= =?us-ascii?Q?X9kuHBBqjYfylJye6ZhxSWZMazGwuUNFqb15jyrMYjvNT4Wha1nHk6FWyHxW?= =?us-ascii?Q?occablTvBq4LUHx3JsfcH9SWSoIUF7uc6sj58m09aIK97HHGsKVvq7QzjGsQ?= =?us-ascii?Q?EQ6aB+MGjWQfwj4h4X3CHMxnG80+qCRUNleff/BZf2cRLjbHAlIYj2TVk4Va?= =?us-ascii?Q?SUF/CwzYZSdmOULe89U3577STDvMEensMAJBJhldUoERxAbejcHceWt4QfBQ?= =?us-ascii?Q?I6u6ecbhYlHXIZb/c67Q353uzomP+wreFz+JYEC9ZzmwK5ZNNivKz4V5j72K?= =?us-ascii?Q?G5dcbLVEplGzcb16o/TaKb3dQHfQ63SBuUCOlM5HXMolnwxtb8SfUpn2Zwdu?= =?us-ascii?Q?ZZAWPJy67RoEsMkTa4xxJ7ED/BVbwHncA3IJRiEHqTlLh217MvtkW1y6OVOj?= =?us-ascii?Q?HJsZycewlfcNafFGfMyQsKgV8YQqBGli0QPZhVFCISKgJJeRV0cXOG/bvLei?= =?us-ascii?Q?N5XsV2O3a8Qe6WBKhCeZjm3o9WB0tFdeC9N7o2x/wbA+4q4qCFiLFQf3nrjE?= =?us-ascii?Q?qsCOgqX+EvAN8o6OLw79zIyKO0igx8NQ8L3v8a5eVHUqlnAzgJ92VHUQGz9D?= =?us-ascii?Q?F2A2IIDeXnMNf4AmmB4Ue1OEcwUsC0TrnuFMml6o6PBwgkb5hRBGEKPUgiY9?= =?us-ascii?Q?yG9HMJxtL999nK7e0CLL5JZKFifHNIanJUwtgpusfXoKcoum+bW1PnY9PDZt?= =?us-ascii?Q?D47JbHBfgWJwAkh2hwJBHhuNIWf38djb6+6S5QnGm4cwDyj1d1QnvxH5pffT?= =?us-ascii?Q?6lPyvOYUpJ4Cqtp3yYzsbPaLuXZ7Xa/IM3JxpyY3kQRvxXBpc9VdMIPvfCue?= =?us-ascii?Q?Cq11oC5b9g/QlyQGnpuVb2Rc8D+DHwQP3UjPYNQvVar3X4nLtqKJA2l/KKSq?= =?us-ascii?Q?9aWzv22hQOSRLqb5S3M=3D?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(36860700013)(1800799024)(13003099007);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Dec 2025 08:47:46.8510 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 109f7568-8e65-4bfe-9ec0-08de3bb69ef0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB9738 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 28DCE8000B X-Stat-Signature: zoubqw5uxk9q1x599qc7r13kpuy37swm X-Rspam-User: X-HE-Tag: 1765788470-158470 X-HE-Meta: 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 MKaLZrHc 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: When collapse_file encounters dirty or writeback pages in file-backed mappings, it currently returns SCAN_FAIL which maps to -EINVAL. This is misleading as EINVAL suggests invalid arguments, whereas dirty/writeback pages represent transient conditions that may resolve on retry. Introduce SCAN_PAGE_DIRTY_OR_WRITEBACK to cover both dirty and writeback states, mapping it to -EAGAIN. For MADV_COLLAPSE, this provides userspace with a clear signal that retry may succeed after writeback completes. For khugepaged, this is harmless as it will naturally revisit the range during periodic scans after async writeback completes. Reported-by: Branden Moore Closes: https://lore.kernel.org/all/4e26fe5e-7374-467c-a333-9dd48f85d7cc@amd.com Fixes: 34488399fa08 ("mm/madvise: add file and shmem support to MADV_COLLAPSE") Reviewed-by: Dev Jain Reviewed-by: Lance Yang Reviewed-by: Baolin Wang Reviewed-by: wang lian Signed-off-by: Shivank Garg --- include/trace/events/huge_memory.h | 3 ++- mm/khugepaged.c | 8 +++++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/include/trace/events/huge_memory.h b/include/trace/events/huge_memory.h index 4cde53b45a85..4e41bff31888 100644 --- a/include/trace/events/huge_memory.h +++ b/include/trace/events/huge_memory.h @@ -37,7 +37,8 @@ EM( SCAN_PAGE_HAS_PRIVATE, "page_has_private") \ EM( SCAN_STORE_FAILED, "store_failed") \ EM( SCAN_COPY_MC, "copy_poisoned_page") \ - EMe(SCAN_PAGE_FILLED, "page_filled") + EM( SCAN_PAGE_FILLED, "page_filled") \ + EMe(SCAN_PAGE_DIRTY_OR_WRITEBACK, "page_dirty_or_writeback") #undef EM #undef EMe diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 97d1b2824386..219dfa2e523c 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -58,6 +58,7 @@ enum scan_result { SCAN_STORE_FAILED, SCAN_COPY_MC, SCAN_PAGE_FILLED, + SCAN_PAGE_DIRTY_OR_WRITEBACK, }; #define CREATE_TRACE_POINTS @@ -1967,11 +1968,11 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr, */ xas_unlock_irq(&xas); filemap_flush(mapping); - result = SCAN_FAIL; + result = SCAN_PAGE_DIRTY_OR_WRITEBACK; goto xa_unlocked; } else if (folio_test_writeback(folio)) { xas_unlock_irq(&xas); - result = SCAN_FAIL; + result = SCAN_PAGE_DIRTY_OR_WRITEBACK; goto xa_unlocked; } else if (folio_trylock(folio)) { folio_get(folio); @@ -2018,7 +2019,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr, * folio is dirty because it hasn't been flushed * since first write. */ - result = SCAN_FAIL; + result = SCAN_PAGE_DIRTY_OR_WRITEBACK; goto out_unlock; } @@ -2747,6 +2748,7 @@ static int madvise_collapse_errno(enum scan_result r) case SCAN_PAGE_LRU: case SCAN_DEL_PAGE_LRU: case SCAN_PAGE_FILLED: + case SCAN_PAGE_DIRTY_OR_WRITEBACK: return -EAGAIN; /* * Other: Trying again likely not to succeed / error intrinsic to -- 2.43.0