From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from DM5PR21CU001.outbound.protection.outlook.com (mail-centralusazon11011011.outbound.protection.outlook.com [52.101.62.11]) (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 907BA29DB6E; Mon, 14 Sep 2026 02:24:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=52.101.62.11 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789352666; cv=fail; b=ZwNDQtMS9+XECv6eyC2ApzJVi24JWWNiYRFfiu06YoYvokfqaXSYa38eWsSOdEaNWUHHsw8YCEISJZLVTKla5PckLJdrI+w0PK7DDVxObW08J/FTO3Pn6KAKCgxQ/HUt9XE97OLTV19ucv8A2aAti5bCKXzeE1doaMXpHxMO2OU= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789352666; c=relaxed/simple; bh=LA7ZnXqPsAszfR1Ql4sikyCXEX9QkFYqkT6HbKr3v84=; h=From:Date:Subject:Content-Type:Message-Id:References:In-Reply-To: To:Cc:MIME-Version; b=dpLLOjOO+7w91cx0C3EfF7p5kY13xwD8gourBBFTqmmExF8ad321JMmleNiJIw1YeZkqQHfzM3TDAKGv8oD6QHNIgawfL0Oh7L4G8vB30iVrww96dmhD2t0ygvIfxBOHiQh07mcM0I0QwdBFrXVW2pZ10V6yPJIfPvNIjvkvPes= 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=CUBOGkGS; arc=fail smtp.client-ip=52.101.62.11 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="CUBOGkGS" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=TG41vWkgIkBZ36zXKL8nTq1hyWgiXsnq6Yo0aJf3/tpBbhyu6mfMEami2jJyLatDupuleCtGUzkN14mH7DT2AALVJ4d+kxfRJ9SBmnpUyYZoyjCslC5bZs/DrRJRoVZsOHOidwYOFMxKMvcSBqwcQ+SkFnVwm9l2HUVKdUDJCbYBy9jvyq+Zy7uBj7/dVlRHZXQZOWNUjyrOvHEsKgF7KwaOHMxCWJYUZbmEO9TYTWKKlA7bhW6zle+rlIB4L9zsBvjvoWelFKzIn6w57Uh9gep1CAg0lmnrqgM+AYuxbNAzzURAJ54clC21QcH2c1qRE3mTfmpffiq13XoupGZOTg== 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=bqOD6bcNk78uxBKGet+fcF3S2zOPVzfhaO0StmOL3HWJWRsZWQGoyu72NP6LeMevrzwOKmpjFmADDEB/afYvzClfkX6dFXSJv9Rqy87hwaVCy/3XU94JvJnlLxyyAqyhlgATzL86Ub7pnTC4eBWz3FzL+6XZSs2M+WHkeXQ7+/yY+yF39hvDWCj005MWf5muFfK+jNzNxdEON0BLEE9efuiAwt3eiTAiDQKDQqHeFxB/SP/0wBpJItPzRjAflF4TlctJrsyhLRpY9hS9VTTTXyNJiU42Ql6+QnNsVUB0uNn4xPNUiO5yxnbXqKzsLJz0yYpbpVsLlwXSJ0Wg2fUEyw== 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=CUBOGkGS/Xh12oy1gyK5dFAznWrlkJR9BqRCLhMv04sTWFJlJEi+V+GS+WmSSIq85gS1CazpLRGb+w0w4vOEQGfLRJ3ekhITJEGc7baNeNWL8dw6aCG9ZZ83usDGSc6nSgcojutjQ6urY7ZmXgyIxWx+aB23m6hAV/HaIQEa+LFZBJ1BgYQpSxrWiWZ1pOwTQWJ7f60QckVowYNeySY5Go5jQo4xyXogX72dQdmR/t4dJV5ZUSTetulL9ripLDPNEbZ/W+ue+YyeB2Y0VtAlNPL8XXARhS+2sDG6HM4Z5QLdw3PCnJJ2IblaQXm6QR8/Gr2SoDBvsDQ/RLGhdd23OA== 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 DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.406.12; Mon, 14 Sep 2026 02:24:16 +0000 Received: from IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16]) by IA0PR12MB8374.namprd12.prod.outlook.com ([fe80::d85f:4c87:ae84:3f16%5]) with mapi id 15.21.0406.007; Mon, 14 Sep 2026 02:24:16 +0000 From: Zi Yan Date: Sun, 13 Sep 2026 22:24:00 -0400 Subject: [PATCH v4 02/16] 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: <20260913-remove-pg_private-v4-2-848550f7574e@nvidia.com> References: <20260913-remove-pg_private-v4-0-848550f7574e@nvidia.com> In-Reply-To: <20260913-remove-pg_private-v4-0-848550f7574e@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: BLAP220CA0006.NAMP220.PROD.OUTLOOK.COM (2603:10b6:208:32c::11) 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_|DS0PR12MB6486:EE_ X-MS-Office365-Filtering-Correlation-Id: 743548cc-34f7-4400-80b4-08df1207460d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|7416014|366016|376014|1800799024|22082099003|18002099003|3023799007|921020|10067099003|56012099006|11063799006; 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)(23010399003)(7416014)(366016)(376014)(1800799024)(22082099003)(18002099003)(3023799007)(921020)(10067099003)(56012099006)(11063799006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?T2hGKyszbmVvMDZQQno5eW5UVS9wclpTZTA2bXZGcm5CbTd5TkZWVlJsV1Ux?= =?utf-8?B?ak45Zzd5d2IvRngvZkg2bVJDNG1XMmVkemp1d0E5c0JYcGxSSEVqaks4Zllp?= =?utf-8?B?cTAwalFuQ1Uvek56Z0xaTTVwYVN2aUNLSHYwKzU0YVFsRVJTQ1ZSVG5ycUF5?= =?utf-8?B?V0QxVVhCZHZYN0szWFQ5NmxlOUNwNVR3eUp6dDA2cTF2UmY1OUhkdUIvWTE0?= =?utf-8?B?dENjcGZFemxwNGJTcFVpa0t0NXNJdVREcXEwN0xseHV0S3hZU3VHUG9FYWN0?= =?utf-8?B?WkhUL3d0K2xKZlVZR0ZGZ1ByVkY3TnVPMHl5WnlobFpmZjJqazc5MEErTWIr?= =?utf-8?B?V0ZEQzJsNUNNR3ZnN2tDUEJHYU5WTm5yaXo1UWRXWG5xdEgzZVM3WnVtbXRj?= =?utf-8?B?VjRWZ1h2TGtrN1FJTDR1VWppNGl2NVQ1MUkyRFBLZUVDTTRlYjJQeTNmRGRS?= =?utf-8?B?eGkxaHFYM0R4YnNuTVdsMVc0YVEydFdyeWIzaWFLRFdUMGhTbnNtRXJCVncr?= =?utf-8?B?dVVJcUwwQlJKdDU2RVJtOVVpOGVtdzAxRDMxY3JmUnFtNlF2K1BYWUhnRUdj?= =?utf-8?B?TVRFWUFETGt1S3hsa0JwcnZaRWI5STJIa3FvSERUM2M3MjIzaVRHSkFNK1lK?= =?utf-8?B?UEZ1NkdHbmVEUU9XTzNYYlIxZjJOSUVGdkp2VkRJWkJGZVAvOXNEZlNYU2Ew?= =?utf-8?B?RXNhemtvT2pJWUY0VW51amRUUUxKSEpQcEQ5WWFJV2JHVlZNckFvYWpMMzZM?= =?utf-8?B?T1ZPOExMbW50NndyT0V1SkN3ZGRVdVBHc0dxZHlhbW90SU9QREw3cUJBYlRE?= =?utf-8?B?V2pUc09sTGFKV2JsQWpqdGx2M1YxcmQzYkU4eVQwOGphYTdTUE1BeFdCZDVY?= =?utf-8?B?eDNFR1dlQ1lkSjYxbXpZck4vbXlHdnptaVpPODB5SU1GaDVLZE5LNzVzYjNW?= =?utf-8?B?ZllCbDlkN0hpdXNnUHdYTFN3WjN1Yi9pcVNRKzJIRzdzaENlNjlZcFhycU5u?= =?utf-8?B?VHI2cUQ5U2RYOHVSdEExQmRyUmhtZmhyWVYyOXkwejZ5czBCSTlCY2xYcjFq?= =?utf-8?B?UFBzdzY0T3pHclBRd0hoVSswVVNrc1F2MjdPSnRZcGplVGpiSmt2K2Q4ZXls?= =?utf-8?B?dWV6RXpEYS81Y0NIK255d1Bnb0lFeUxPRFFNSkhtNmZiTUk3ZUF2dldsYU80?= =?utf-8?B?aHA4MnhZVmRHWU0yVDhyUm4xa1VnZnNRVFR4RUFhNFNQTS9jVUVad0NyU2kx?= =?utf-8?B?cUE5SG9KUFFIREM4N1hWMXpRQmowaUtsNmRMYTRUSFAyMVpZam1PU1RPTTBS?= =?utf-8?B?T2liNWtKVFB2R2txbFBWQWpDSnVwZVlmZzBiK2FrNFhnMWNTZkpBdlhvWWl3?= =?utf-8?B?eUdmaWgvTzVTT2swcWFiay9idmhtV0krMU53Zlp6VmVtTXdJVU9ndlFMSDVH?= =?utf-8?B?TDBSUGVGcjhyUFJqeEY4a1doSkM5RjhXb1dKNDlqREhQNUE2Qm1jUGpYMm5B?= =?utf-8?B?aWlvTUdnMXZrc2pXa1h5dG1JNldmdE1WUFNlZVY0UVdld0d4MUptMzcvRWVn?= =?utf-8?B?WmtwWUFTMzA1blgzQXRjeVJrY0dMbVc2YWxxd2Q3RjRzTm5maFlwR3BvYlB4?= =?utf-8?B?Q21VeDMvK3VQOU93QUpDRzZqTEw3clRxblVuV20yejh6VjNzaWxiaEJJZ1U2?= =?utf-8?B?K0lYM1FyWTNHVk5PTzVuSStJUWhuWkNQUnFVRk02QUJoS2ptVUZ0dEE5anU2?= =?utf-8?B?NzJ5dDljSGtPLzMrV2F4VU1NbFRhK2lJdmJDYWFwS2dQMWRISjg3YmdSVHNw?= =?utf-8?B?TjNTWnFiWEtEUGxabW9iWGgzNmZ0NXRlbEdHMjVVL0dHSmE0UldCei8vb2JW?= =?utf-8?B?TmFrN0RQdzdnVTFYS01vUVdZdVlrL1l0ek1mRUYwWFJpSFNsZjdpMnhyWmRG?= =?utf-8?B?ZURKSUlDdGpnVGdrSVY3aFdSR2lwRG1PeE5ISUtVbXE2cWJka0JQZ1RheVlW?= =?utf-8?B?VEN5UE9IQXNMWHVsdkxubnVvaUhIZWVkZlhtdHF5RmZoOXF6aXgxdEQyUlVz?= =?utf-8?B?WEpkUlV1ZkRBY1ZxR1BpNndiZFhyWVVxTENzekVxWXorbUpwdlFxaFBEaWhL?= =?utf-8?B?TzRnQTl0NlorOHg2c2tpZGNRbFdaTDVaaGdIZEFycFVlb3lvcHlSbWZQSVVk?= =?utf-8?B?cjRkNCtNanpYTTdDazVhVDZ1U1F1SVlZSUJkaWJIUUZaVTNacDd2bVM1UEta?= =?utf-8?B?OG5jcDdmQzFuVVdvcU9oM2Qxd3hGWWdZSjNLemlNRTRoclcxR0dQZnRYWk9K?= =?utf-8?Q?8nO7UM75gEytvFWqfO?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 743548cc-34f7-4400-80b4-08df1207460d X-MS-Exchange-CrossTenant-AuthSource: IA0PR12MB8374.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2026 02:24:16.0157 (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: YrCfjlk2iCViqgCSPFpIk+YbG/5Aoh2/izuE0Kp5KSSDgbacq/BZY79aefC54EGI X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB6486 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