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]) by smtp.lore.kernel.org (Postfix) with ESMTP id E7C00CA0EDC for ; Thu, 14 Aug 2025 15:35:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8453F900194; Thu, 14 Aug 2025 11:35:03 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 7F499900172; Thu, 14 Aug 2025 11:35:03 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 69424900194; Thu, 14 Aug 2025 11:35:03 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 538A6900172 for ; Thu, 14 Aug 2025 11:35:03 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 20ADF1DD092 for ; Thu, 14 Aug 2025 15:35:03 +0000 (UTC) X-FDA: 83775761286.01.7740888 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (mail-co1nam11on2041.outbound.protection.outlook.com [40.107.220.41]) by imf03.hostedemail.com (Postfix) with ESMTP id 591F520006 for ; Thu, 14 Aug 2025 15:35:00 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=YRsAZaMm; spf=pass (imf03.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.220.41 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@amd.com; dmarc=pass (policy=quarantine) header.from=amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1755185700; a=rsa-sha256; cv=pass; b=wiglPz7wOq09j1fBsF2mWAr8hrGyp6G2HxmY/lJPvSwLM5gakJ3eIQ+HTRIkMGPfQ/keJw dsiewb20j3SnRkAL0NUCT+Zo1pUpsDHYAz9yCtko6jIzygzb9XvVxjK85jgrHU0dCU5ehk TCjjQjUTpx9MaBmXGrafXwnkZDio7gQ= ARC-Authentication-Results: i=2; imf03.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=YRsAZaMm; spf=pass (imf03.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.220.41 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@amd.com; dmarc=pass (policy=quarantine) header.from=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=1755185700; 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=WPVAyiNS4OZw8nJS07dTRaK/Lrchm9e7Lwh000KIeVY=; b=OmacJrsZ+BbT+ABcvOijUIK3CsPOlCAEZh9pOYEAfXOpyHBJAerdha7YyPPEs/gPIw/G9w +hOYS+eBZmL7zN6bF8FeuvjZCOzVPxtiqjEjZ+z04kxB8hl1EfX5djJl5Q3xul+53e2bGF BAHQPP4wATA9StMS67DiXWZ8sGnHcSA= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=jvM6iM5ceCuOQVC3oj7oefy6BqfmFH4zAg9bOctTrjnPidNrKzWMNShVITc4kD/R5tDZI2kCAeFQhew2o0fMz0IrQ+WNK67DpksJ2pdXP+1tuBmpmZdQQVWlrnj64crhOrKeXxdCiMaRyqjKqSDy3gLnUYF843c1/iKcM1EvA3BLGAS2LjJ6WREwIUuvoJ0bJ45XcoZNumLiioga2253CcaM3r9G2cychZQ8ap2BZjulFhS6gglgHCMFZSDlq623B80sNeys96iBpy6RpWK+3wnCy3uIgwiNx+nz/aAOMEifMTIdWAZNRmmLFWZ6Tkl+AwA+pC/spLj83DoKdXI6ew== 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=WPVAyiNS4OZw8nJS07dTRaK/Lrchm9e7Lwh000KIeVY=; b=zVIPLjSHaLLEdiflPThM90/Ii5UTJQEekvz0MotIe9w9BiQbkMxK4NJB0ZNt7wp2wrQOxHMTqPiDTY744jZrjz29TFk0tq7md4FeYTW4f8uwXruqpjSm3q5dunrfxkFfS+K4bZCyaTBHwzzMSC2v58JX26/+CMbiQXZkh+ITDUNr9sD2xcJGnjSKOe9AEBGibOlFOchI9pgTNiifTWJCllZ7w1b9ExjTcsB0AIYWryMjXbt3ubXpzkm57faW/W5grU6ToPC2L0kygYKn7I3X0iGVhgsyecjrRrR8x6/pxvC1jpU1UFPo/5oB0FjR2sOqDJTWXbSRyEQukBa6Wi2OIQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 165.204.84.17) smtp.rcpttodomain=arm.com 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=WPVAyiNS4OZw8nJS07dTRaK/Lrchm9e7Lwh000KIeVY=; b=YRsAZaMmtP9uVLef7zKlohaEvrxMzJvTta6J/mQh3kmFZ/yZXA9vsfI1T8buprz+yMsIT2kwuKO0wEnvbkw55Zyv3Z96xscyV4wTgAMG9/KYArOWIsPGR97c4FDrDJnx85jeM0atHqxSBOYmzbXyyV5ftboTd/6OBT31rMDQfhc= Received: from MN2PR05CA0026.namprd05.prod.outlook.com (2603:10b6:208:c0::39) by SA0PR12MB7076.namprd12.prod.outlook.com (2603:10b6:806:2d5::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9031.13; Thu, 14 Aug 2025 15:34:57 +0000 Received: from BN3PEPF0000B075.namprd04.prod.outlook.com (2603:10b6:208:c0:cafe::46) by MN2PR05CA0026.outlook.office365.com (2603:10b6:208:c0::39) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9052.6 via Frontend Transport; Thu, 14 Aug 2025 15:34:56 +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=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BN3PEPF0000B075.mail.protection.outlook.com (10.167.243.120) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.9031.11 via Frontend Transport; Thu, 14 Aug 2025 15:34:56 +0000 Received: from tunga.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Thu, 14 Aug 2025 10:34:46 -0500 From: Raghavendra K T To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH V3 08/17] mm: Add throttling of mm scanning using scan_size Date: Thu, 14 Aug 2025 15:32:58 +0000 Message-ID: <20250814153307.1553061-9-raghavendra.kt@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250814153307.1553061-1-raghavendra.kt@amd.com> References: <20250814153307.1553061-1-raghavendra.kt@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B075:EE_|SA0PR12MB7076:EE_ X-MS-Office365-Filtering-Correlation-Id: c99a4623-ea3f-43c3-16d3-08dddb481f81 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|7416014|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?pJli8E3NtzuwHCX561DIowNErRI4bURBXTfcsdjZytezFdcXJSQ0cuEHOmD2?= =?us-ascii?Q?fZe4x6kQPhXGpRrfFGzViJPm1SwqCCo57tloOXRtTCoLPEOUA7GCRzUUAFkj?= =?us-ascii?Q?AmtPHZgZNE/xFQaYAy2yR0al9QqTcB94VfdRHaf58kMn2nHzIIwFqU9YgCzG?= =?us-ascii?Q?Jw0t8quDaUpUy1H2IU5tpr6JnUeHbZxkUyzP4OZ1lsPqIZwR/Vmbn6FakIsp?= =?us-ascii?Q?O9No9dlBVMkznNvehmCOE7qlRKVMwSVVvRow6T6FD6jBluqGSb602z3xREVa?= =?us-ascii?Q?HU7Nf3crg/GY2C2UsjyuW/IO0UWP1XmB4c+Xg1d4+15c/cQkvaVhjAvvRsGV?= =?us-ascii?Q?2xMVBy2pfkZmbuzkUv817UPAuwvsYYQeOKGE/16s/Jj4nMm1wEZbSjZSvUtv?= =?us-ascii?Q?pTdzGv7/xgkqZUwgqGIbhAe/96LRWA/dXNjpb+qVVGVOHbbdNkXXQAIniUlJ?= =?us-ascii?Q?KwblkJOsGm0zkTfR2tEQm0b6Aeb7DA6O64fSgmyXzo9UYsH6oaYver017kaM?= =?us-ascii?Q?n4910WMlfnYlPhHXeRrLA3Vbcom5j2rxoXZcT5bwk3dblzvJ/4djtXjNhYRC?= =?us-ascii?Q?vsTqzydQTwqh8WOtfZQ9ydwvUOTk2zAdUXK9kMaKTI/M97Sko+2s6+lNhG5x?= =?us-ascii?Q?QeYkvVGPEyIzAHHserlmVmQBHFm2R/Bazt36VMEg57YPlaH8vz/GpnOm9mxJ?= =?us-ascii?Q?BqDY12XkrcNSJgh1j2W8lbwlQ9ISO+Q++KL1JnV+Ql0IObiSgALh+ml1G8Ps?= =?us-ascii?Q?4yaKX0JPuqiwKO9ubnZjRqVxx6rgoIPe/fLk7bkCOAfhPrQMEFWAMyeikT+T?= =?us-ascii?Q?g/yAT8m5MS7qPg/o9NANb6XTq+jPd8/bPLHFrnWu6XfuvdslGKAgIMHHn+kk?= =?us-ascii?Q?44gbIZJftHwHuMPyA/mvFWuJxJxsp8nFrtetzfdGa867RdqjLA9OCxg1EbPA?= =?us-ascii?Q?77o38tpBTJunSWKQcw8vJ2gIf4uQAfl+G9zQsOXkeHfS9fK24Y0MoqODYVTu?= =?us-ascii?Q?z0S+MXLlARcdo1ah4kDxzzgCmoY0wTLWIXK4VJm+CQypuz5PaX1N+XbTVuH1?= =?us-ascii?Q?w77xerjpkKXDDtXpNaYuZy9sbn6ziC2/xDVzoqhLc/Z/UDCC4kohOFeW6LOE?= =?us-ascii?Q?OJZAnowGD+P/cKSL2DEYgc0yEDrqO9ZhGf1yAnka5d3w4gUtejnilGlCE4sU?= =?us-ascii?Q?7pzTCO5ZzynUHTmIf7vPHA4TIGxbeVZ1mOMx8pJCEZ9iFOBtnrJbEJFVXiqq?= =?us-ascii?Q?1Q9W/sGTG9uM+to+bwurWxG08FKym/LHuMgyBeP/Cf1LC+7G1kf8Fscgp39x?= =?us-ascii?Q?upkn7e9e05rnh9Jn8OtCAzXapWPdWF2ReTH3uQGDBetshpH2PFbRDgrhl4mU?= =?us-ascii?Q?DnhS6+sH5UjJwSEpUUYeI9hUvzarldYtRs4K4S77al8Z7O/oy2b9AjvB6e1h?= =?us-ascii?Q?v0m9KZKMMbxz8Hw1PG1Vm3nrgPP7uovuFP6ZqwVssd7YqRh27SupNT/NMzUp?= =?us-ascii?Q?AqynZMFH8d3NbBKM/xcZczIFtJtJHkkDo6f0?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(7416014)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2025 15:34:56.8733 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c99a4623-ea3f-43c3-16d3-08dddb481f81 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B075.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB7076 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 591F520006 X-Stat-Signature: sxuzseqhfthhgbehyarf8possjqja9gu X-Rspam-User: X-HE-Tag: 1755185700-819500 X-HE-Meta: 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 wARKjP/N WrIq1PAjrkNyYoD2g+UQ1vlwl8usRPq8RXio8XhYPKcww0IqcYINSRUrLPiiu9F7bh/hpCZYBSH1rUa647yU04a6A/qQieZguo9oCVXSZ7Xumuo4TC/WN26qDSocrjQaqb8Q/qspty1jkEVHy+Q8EzJFV2c5xHfZKw5gjY2R8KzRSKhdyQrrGwjssTmtEm3H50PhAPFivQ2aXvLAOu7ejpRYZdClc8/vNPlIah7AZGc3+FavwKdPqmkhjzpaBrEJMkMqXAiqhsFpXH5hyd2kWxRft0UHE6NFUUaBKtoLLD7QgwnEGEYkyX3RmRiHU5Qbion8/iQbYKynRlEVs2YiPVp3QmAnww7mPnigyR15AQgTMPC0IRrfu228pHxuTHXvVXs7s 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: Before this patch, scanning is done on entire virtual address space of all the tasks. Now the scan size is shrunk or expanded based on the useful pages found in the last scan. This helps to quickly get out of unnecessary scanning thus burning lesser CPU. Drawback: If a useful chunk is at the other end of the VMA space, it will delay scanning and migration. Shrink/expand algorithm for scan_size: X : Number of useful pages in the last scan. Y : Number of useful pages found in current scan. Initial scan_size is 1GB case 1: (X = 0, Y = 0) Decrease scan_size by 2 case 2: (X = 0, Y > 0) Aggressively change to MAX (4GB) case 3: (X > 0, Y = 0 ) No change case 4: (X > 0, Y > 0) Increase scan_size by 2 Scan size is clamped between MIN (256MB) and MAX (4GB)). TBD: Tuning based on real workloads Signed-off-by: Raghavendra K T --- mm/kscand.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/mm/kscand.c b/mm/kscand.c index 843069048c61..39a7fcef7de8 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -28,10 +28,15 @@ static struct task_struct *kscand_thread __read_mostly; static DEFINE_MUTEX(kscand_mutex); + /* * Total VMA size to cover during scan. + * Min: 256MB default: 1GB max: 4GB */ +#define KSCAND_SCAN_SIZE_MIN (256 * 1024 * 1024UL) +#define KSCAND_SCAN_SIZE_MAX (4 * 1024 * 1024 * 1024UL) #define KSCAND_SCAN_SIZE (1 * 1024 * 1024 * 1024UL) + static unsigned long kscand_scan_size __read_mostly = KSCAND_SCAN_SIZE; /* @@ -94,6 +99,8 @@ struct kscand_mm_slot { unsigned long next_scan; /* Tracks how many useful pages obtained for migration in the last scan */ unsigned long scan_delta; + /* Determines how much VMA address space to be covered in the scanning */ + unsigned long scan_size; long address; bool is_scanned; }; @@ -746,6 +753,8 @@ static void kmigrated_migrate_folio(void) */ #define KSCAND_IGNORE_SCAN_THR 256 +#define SCAN_SIZE_CHANGE_SHIFT 1 + /* Maintains stability of scan_period by decaying last time accessed pages */ #define SCAN_DECAY_SHIFT 4 /* @@ -761,14 +770,26 @@ static void kmigrated_migrate_folio(void) * Increase scan_period by (2 << SCAN_PERIOD_CHANGE_SCALE). * case 4: (X > 0, Y > 0) * Decrease scan_period by SCAN_PERIOD_TUNE_PERCENT. + * Tuning scan_size: + * Initial scan_size is 4GB + * case 1: (X = 0, Y = 0) + * Decrease scan_size by (1 << SCAN_SIZE_CHANGE_SHIFT). + * case 2: (X = 0, Y > 0) + * scan_size = KSCAND_SCAN_SIZE_MAX + * case 3: (X > 0, Y = 0 ) + * No change + * case 4: (X > 0, Y > 0) + * Increase scan_size by (1 << SCAN_SIZE_CHANGE_SHIFT). */ static inline void kscand_update_mmslot_info(struct kscand_mm_slot *mm_slot, unsigned long total) { unsigned int scan_period; unsigned long now; + unsigned long scan_size; unsigned long old_scan_delta; + scan_size = mm_slot->scan_size; scan_period = mm_slot->scan_period; old_scan_delta = mm_slot->scan_delta; @@ -789,20 +810,25 @@ static inline void kscand_update_mmslot_info(struct kscand_mm_slot *mm_slot, if (!old_scan_delta && !total) { scan_period = (100 + SCAN_PERIOD_TUNE_PERCENT) * scan_period; scan_period /= 100; + scan_size = scan_size >> SCAN_SIZE_CHANGE_SHIFT; } else if (old_scan_delta && total) { scan_period = (100 - SCAN_PERIOD_TUNE_PERCENT) * scan_period; scan_period /= 100; + scan_size = scan_size << SCAN_SIZE_CHANGE_SHIFT; } else if (old_scan_delta && !total) { scan_period = scan_period << SCAN_PERIOD_CHANGE_SCALE; } else { scan_period = scan_period >> SCAN_PERIOD_CHANGE_SCALE; + scan_size = KSCAND_SCAN_SIZE_MAX; } scan_period = clamp(scan_period, KSCAND_SCAN_PERIOD_MIN, KSCAND_SCAN_PERIOD_MAX); + scan_size = clamp(scan_size, KSCAND_SCAN_SIZE_MIN, KSCAND_SCAN_SIZE_MAX); now = jiffies; mm_slot->next_scan = now + msecs_to_jiffies(scan_period); mm_slot->scan_period = scan_period; + mm_slot->scan_size = scan_size; mm_slot->scan_delta = total; } @@ -814,6 +840,7 @@ static unsigned long kscand_scan_mm_slot(void) unsigned int mm_slot_scan_period; unsigned long now; unsigned long mm_slot_next_scan; + unsigned long mm_slot_scan_size; unsigned long vma_scanned_size = 0; unsigned long address; unsigned long total = 0; @@ -843,6 +870,7 @@ static unsigned long kscand_scan_mm_slot(void) mm_slot->is_scanned = true; mm_slot_next_scan = mm_slot->next_scan; mm_slot_scan_period = mm_slot->scan_period; + mm_slot_scan_size = mm_slot->scan_size; spin_unlock(&kscand_mm_lock); if (unlikely(!mmap_read_trylock(mm))) @@ -994,6 +1022,7 @@ void __kscand_enter(struct mm_struct *mm) kscand_slot->address = 0; kscand_slot->scan_period = kscand_mm_scan_period_ms; + kscand_slot->scan_size = kscand_scan_size; kscand_slot->next_scan = 0; kscand_slot->scan_delta = 0; -- 2.34.1