From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from SN4PR0501CU005.outbound.protection.outlook.com (mail-southcentralusazon11011015.outbound.protection.outlook.com [40.93.194.15]) (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 0AF6E3033DF; Mon, 21 Sep 2026 02:28:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.93.194.15 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789957710; cv=fail; b=MxKfTHbIuOyWF/HlBKNIjgNZmjNRjKj1Wq8RyXOXjZmtO/1SRhQVJMdfeWMRKEfg5/zfckBgh09qz07kX+ZkUwS/iJEmP6ZEHNDPyGmEGjB7RwqQXkLsrvFnnxBqsNC/6lBUyZxStdB9QkhTb1vNytomm6PhrDFV1fBKfgZ0X9w= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789957710; c=relaxed/simple; bh=LA7ZnXqPsAszfR1Ql4sikyCXEX9QkFYqkT6HbKr3v84=; h=From:Date:Subject:Content-Type:Message-Id:References:In-Reply-To: To:Cc:MIME-Version; b=FUgDj8r+6YHREnJXKbN9BgFZ1hfjZ/QD4wAyy4JhKbDfCv5cRzUcEzieJUM+cjXgP54Rl/Wtyf13pGRE4G5TFusMAC5qKTv1uO21RSp5McDQG8SwEFVNqLurx1hQmCmdTHbWtdqu0bsisCgDRlnpVd/P4K3hexFwC4fPB1RQFIQ= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=GFrTE7qk; arc=fail smtp.client-ip=40.93.194.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="GFrTE7qk" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=ggs2EDfCGpVTrZsdLn6IJVsIs64rGg9TugBMz/gMx1ucU8ZC6QUYAhL0iJ7sRtlaUERIbyPEd6P0tl/739QONWJQbvisra+42J4mr5wq+TeVwL8zF8n6gld4u2DKEAO4+xuXt1oodci+fMhxjn8ef6KT9f9mrFeH3OU0/ujqTS3B4TqTrjj9sEM6IrxVCTuJnmX46cRWTTRymuBwl0KECR+QzN78BGLwIZfOeLec9KaVzTtDR2DTHHkEQZNGpylW0OjTCze60NTuZaOxK5/FsCHCrwKrtLvRTjn9ESi15JrjBQCLZuiDISiSPFWQwSd8hH3CzK06ooi8bYhWis0xhQ== 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=gpnw9Gpg4JeqTBKlcim2Ze+bj98VqYRU3sYXsAgbZDY=; b=vBIw5oGpHbF58ghKcykBM3/NH1T6rnXX8dEE6w9tvxdqrgEHCp6zI60Al000hszhS35BihqWxPlFzvhSttYp1jIT5aQg4v2RoMyf1OuUd2rR0EDlN7VMNmf9QTD2NXIA+5BzjYYx8ZomzMmrQXxi8qEB05CUvzSv9DCiDjbT5fUR70GpYNHxg++x5lkw0owhW+IPmHJGcAxbj/MRoM7tcBAvSDcECfvKf0LdFLaO5n5EHaQF7tTr/kPIrXEdyEIV8rt1O0B1SIhplDed4YjiK/+JcpP+0mQFXf3hDkZ38ABPWUZc9nNFibTV80hqD0hjFcX23jc8XbBfYncndEhP1g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=gpnw9Gpg4JeqTBKlcim2Ze+bj98VqYRU3sYXsAgbZDY=; b=GFrTE7qkTeg76thzaKrcjPgcwWdwX/besl7dVcHkKyqlcpbaK7kmo9ChyI1NqCs95sCJOkUUBehzWMa28sI//6jwPMlXTIwJvxur3GC+lvsZnSuFPwpJVDTCBAW+6jpf3KH6qQGXksKTVimbATuyLGUHK3Y/dAphhMH04Elwe8eR1kjYNSWmcc7OrcDmtvloDgm76l0eFXgq2D+ETukTZwJ2RgIha4zXTcE+SirTChMOC3mcmucnnVlBy2JwvvHnFvZFPp0p+zCeP5COJ+ZJSJvw05NLfUgq/FovESfbdXBsN9+0QZE3TTmDNoFQf4fn41V1dMHDpAcgI3Hm4grdOg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) by DM4PR12MB7719.namprd12.prod.outlook.com (2603:10b6:8:101::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.428.16; Mon, 21 Sep 2026 02:28:21 +0000 Received: from IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16]) by IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16%6]) with mapi id 15.21.0428.014; Mon, 21 Sep 2026 02:28:21 +0000 From: Zi Yan Date: Sun, 20 Sep 2026 22:27:58 -0400 Subject: [PATCH v5 02/17] perf/ring_buffer: stop using PG_private as AUX page high-order marker Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260920-remove-pg_private-v5-2-bb68b6a21869@nvidia.com> References: <20260920-remove-pg_private-v5-0-bb68b6a21869@nvidia.com> In-Reply-To: <20260920-remove-pg_private-v5-0-bb68b6a21869@nvidia.com> To: David Hildenbrand , "Matthew Wilcox (Oracle)" , Andrew Morton , Muchun Song , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Gregory Price , Ying Huang , Alistair Popple , Johannes Weiner , Qi Zheng , Shakeel Butt , Kairui Song Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zi Yan , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , James Clark , "H. Peter Anvin" , linux-perf-users@vger.kernel.org X-Mailer: b4 0.16.0 X-ClientProxiedBy: MN0PR03CA0013.namprd03.prod.outlook.com (2603:10b6:208:52f::24) To IA0PR12MB8374.namprd12.prod.outlook.com (2603:10b6:208:40e::7) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA0PR12MB8374:EE_|DM4PR12MB7719:EE_ X-MS-Office365-Filtering-Correlation-Id: 2ff938b0-761c-4f8a-10d8-08df17880173 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|23010399003|366016|921020|3023799007|10067099003|56012099006|11063799006|22082099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA0PR12MB8374.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(376014)(7416014)(23010399003)(366016)(921020)(3023799007)(10067099003)(56012099006)(11063799006)(22082099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?eWV5U0JySlp3THhaNHJBWDVNcnQ0WW84dFRWMlZVU1llZlJRU2tSbUdSK2RO?= =?utf-8?B?b2U2aFNSVlRNaG8rek5GQzBhV25hamREVzJxUlZOTVk0WGJoUUozbmg1eUNj?= =?utf-8?B?SVJTTnFHNDJINHNuWGNMUDRTOFAyZ2xCVFB3NU15OEVCSmIrVDBGam9kZlRK?= =?utf-8?B?aUFuZ0JlZHNRU1hTVUczYmRpL1crVGpXbnA4V01CWENqejB4R3ZBT05VN1hC?= =?utf-8?B?YUI5elNRODMrTGJmK0h4aEQrbmNhMmxCZm9Ma3NNZVJUR2JyOTdsbXJ3blZw?= =?utf-8?B?amFCTEd3cFBRa1IxcWw0ZGpwY2pOUjFoK0R3ZWxNdnNtSGJaa1ZxWTB3dFls?= =?utf-8?B?emFKWm9lMjZEeVdodHA0SnhIQ1YzMTFab1ArdXBUVlF4Wm5LMjBFL2cxYzMy?= =?utf-8?B?WEgySkFZV2ZDQ2x3TDVPVlR1TDZCbDhVekFnZVRsTWhSbFJnWGVFQkROcG4y?= =?utf-8?B?WUxtc2VBdDhtM1NVWEtGd1c1R1hVYkExTjdxem5LaCsvcUdwYVNYMG8yT3BC?= =?utf-8?B?VXJobXhzb09lT2NnQzRVODRVaFZLem9zNmJWRkpmL1BnRUdTMUpDa3ZreTRS?= =?utf-8?B?MlJYbmpuQlZHR3RscHo4VTVBRy80dVFRMDBmcVRxWWtIYU9tV1RnOWt1c0xU?= =?utf-8?B?czlkQzU3QnhvQm9IRHl0MGg3NStUMGc5bXJXSWcwV2VjTzB4ZTZCR3owOVpj?= =?utf-8?B?a1F4ZXppNjRVMEthM3B4VDRSYzhoL0tqNkJXOXBXYzJLbVgwUUVsaU8wcDE0?= =?utf-8?B?UTdYdTdiSkdZTFNQUTRPVFJ1WFhQN0xUQ3VnQXV2NXdrYS8ySlZzL2RNc1Rn?= =?utf-8?B?QnRPcTlQUUcwbEoveGtyTnIxbkZoV1JpUFNCN0dJQTdheE1hR1FvWjQwdkxj?= =?utf-8?B?ejM3bldJbG9QbzZBaG1wTWVZN0hTbFlhQXp5ZGliRTlueEFqS242SFZBcnh0?= =?utf-8?B?WTNsKzY2a3VlTjV6Z2JZSlpWL3VXb25NbmxKaUdwTS91bm10WG5NRHBPYWpL?= =?utf-8?B?Y0d2cEFsNjQrY01LOXV6QWhLanlhd09iQmYrUG9SZnNEUU5JMHh3NGVKQ2Fy?= =?utf-8?B?Tzk1QXZFaFpJbVR5VEdUd1E2KzlJTHBzQnNFdVRFWEljSVZ6VitIRTdENTRr?= =?utf-8?B?bEF0Q3lMTzVWRnpyUDRqU0ZjNlUzUVVrYkphclZLNjBqRzk2bW1WbFVwSXZx?= =?utf-8?B?RFJ2QkhxRDJlRGtuYTJ2WkxSQmlvcFNKY29TZ0dPMXBhTXh4U2xmbmJVRmJ0?= =?utf-8?B?MnZuaGE0WitQQ2hIZWdjajBhU1BoNC9icjZGcHM2bTI5WGNuUjRQa21pMGFz?= =?utf-8?B?V3VpTFV1K3U3bVdFL0F1S2hLN0hpZG13Um81RFYwUGt4Q0pDZFpQZGlFVjF5?= =?utf-8?B?U0VpNVA3SG1JcjFCUXBYM0Q5SFV5OUd2bWRpM1VsamxwZHQySFFiVFVZKzUy?= =?utf-8?B?bm1LMmVReXd4U3VoQjRaWnA1N3VMWW9SdTJPMnFua1JreTkzNjI5UU81NENV?= =?utf-8?B?T3MxOXBYeFdIMnZsOHBNQ0N3YXRNZnRmV01CNlByZkFOMUtaY1l1NmlzVmtC?= =?utf-8?B?SzAvVVI0emRCQ3hDUE1mL1l4RVZLRGFmYkhrKzdXVEl1OHlGRnhReEkxNDlV?= =?utf-8?B?c2lOOHlzWmVmWk1rdHdId1ArbUhsd1dzeW9MWElPT3hkdnM1QjBIZytxa0Ft?= =?utf-8?B?Ui9FdmUvRlZ5bmErYld5K3BZbHh5MThJeElKaktiZVg5d0VTbmlsMmVTK1lF?= =?utf-8?B?dUdIMlVsR1pxM1pLNGF6enhqSURsZkNkVW1NcUhrcGE3S0IyT1RvUXliRXFE?= =?utf-8?B?K2RTOERadldtdnF3bU1mOW13YXpxM2tROFFzcThYbXQ4Qjc3SDBuYkNQVnMv?= =?utf-8?B?KzM2NzdDSXY0NjJvTmVnc0dhMml6emtKcjVvandINHJ0N2hGQzVPRzRnYmVM?= =?utf-8?B?V0pyN0RFc3hRTzNDQVhVZ2szd2tsa2h2V0dqaXc3N1RwUkNMSCtKZ3M0dVZY?= =?utf-8?B?STl6R0xPR0kyb0gyWG5oVmpqNnRmS0NEU2RiOGtkOTZJTG5zeDRjNDlQWDZD?= =?utf-8?B?bTVmVXNXNXBtVjhqRkNEcXMyT2FjbGpvMDl0c3d5OFRBNjBNbjBvS0JTT0lz?= =?utf-8?B?a2QvWFMwdy95K3lLeGlmWmdzMXdtNTZXOCtNQ3VRdlV6UE82SVhJTGF3bU9z?= =?utf-8?B?bWNaQVJLUHNENjI1THVVeWpyRzRvdGVkTXdyZm52eHd5OHZ2ZTZ0Rlhsd1Rz?= =?utf-8?B?TXBkUVZJTHVWS21tb3lWaFVOcXBhaDBLT0h0UVM2bmE2T3BzbjNMV1N2T1RS?= =?utf-8?Q?WwPQIdP4wlBNC+Z0ZS?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 2ff938b0-761c-4f8a-10d8-08df17880173 X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Sep 2026 02:28:21.7946 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: RsMroYURnNclzEm3mUc0sBDZ5NZbOh0xs7kzioKBtIcFj7b+BStuV+h9uD1y4fRj X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB7719 A high-order AUX page sets PG_private on its first page and stores the order in first_page->private. Stop using PG_private and check first_page->private for AUX page order only in the ring buffer and its users. This is fine because page->private is 0 for order-0 AUX pages, matching the page order. It prepares for a future commit that remove PG_private. No functional change intended. Assisted-by: LLM To: Peter Zijlstra To: Ingo Molnar To: Arnaldo Carvalho de Melo To: Namhyung Kim To: Thomas Gleixner To: Borislav Petkov To: Dave Hansen To: x86@kernel.org Cc: Mark Rutland Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Ian Rogers Cc: Adrian Hunter Cc: James Clark Cc: "H. Peter Anvin" Cc: linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org Acked-by: Usama Arif Acked-by: David Hildenbrand (Arm) Signed-off-by: Zi Yan --- arch/x86/events/intel/bts.c | 3 --- arch/x86/events/intel/pt.c | 6 ++---- kernel/events/ring_buffer.c | 7 +++---- 3 files changed, 5 insertions(+), 11 deletions(-) diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c index cbac54cb3a9ec..5849392cf26d5 100644 --- a/arch/x86/events/intel/bts.c +++ b/arch/x86/events/intel/bts.c @@ -66,9 +66,6 @@ static struct pmu bts_pmu; static int buf_nr_pages(struct page *page) { - if (!PagePrivate(page)) - return 1; - return 1 << page_private(page); } diff --git a/arch/x86/events/intel/pt.c b/arch/x86/events/intel/pt.c index 5754cd4055628..49349afee6119 100644 --- a/arch/x86/events/intel/pt.c +++ b/arch/x86/events/intel/pt.c @@ -781,8 +781,7 @@ static int topa_insert_pages(struct pt_buffer *buf, int cpu, gfp_t gfp) struct page *p; p = virt_to_page(buf->data_pages[buf->nr_pages]); - if (PagePrivate(p)) - order = page_private(p); + order = page_private(p); if (topa_table_full(topa)) { topa = topa_alloc(cpu, gfp); @@ -1296,8 +1295,7 @@ static int pt_buffer_try_single(struct pt_buffer *buf, int nr_pages) if (!intel_pt_validate_hw_cap(PT_CAP_single_range_output)) goto out; - if (PagePrivate(p)) - order = page_private(p); + order = page_private(p); if (1 << order != nr_pages) goto out; diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index 9fe92161715e0..061b5cb222266 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -630,11 +630,10 @@ static struct page *rb_alloc_aux_page(int node, int order) /* * Communicate the allocation size to the driver: * if we managed to secure a high-order allocation, - * set its first page's private to this order; - * !PagePrivate(page) means it's just a normal page. + * set its first page's private to this order, otherwise page's + * private remains zero. */ split_page(page, order); - SetPagePrivate(page); set_page_private(page, order); } @@ -645,7 +644,7 @@ static void rb_free_aux_page(struct perf_buffer *rb, int idx) { struct page *page = virt_to_page(rb->aux_pages[idx]); - ClearPagePrivate(page); + set_page_private(page, 0); __free_page(page); } -- 2.53.0