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 24FCDC7EE2A for ; Tue, 24 Jun 2025 05:58:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B12CF6B00C3; Tue, 24 Jun 2025 01:58:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AC3DA6B00C4; Tue, 24 Jun 2025 01:58:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 98B7B6B00C5; Tue, 24 Jun 2025 01:58:49 -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 877B06B00C3 for ; Tue, 24 Jun 2025 01:58:49 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 069BF12306A for ; Tue, 24 Jun 2025 05:58:49 +0000 (UTC) X-FDA: 83589240378.13.A05001E Received: from NAM12-MW2-obe.outbound.protection.outlook.com (mail-mw2nam12on2045.outbound.protection.outlook.com [40.107.244.45]) by imf13.hostedemail.com (Postfix) with ESMTP id 0D16E20006 for ; Tue, 24 Jun 2025 05:58:45 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=favbM7BI; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf13.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.244.45 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@amd.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1750744726; a=rsa-sha256; cv=pass; b=MoB0khKh1/m0apRtjyJdxgl+kkKqq6v4XLI8TQEC1KsjiaojcKqRSR7Zjj3xBrXrR4pNEa xcU4eX92wlDlrdwWFP6t45nCv93XFNdNMfxvdu+IaRn7oDad70i9rfUSIm8oAmvpWUW0gH F2nK4x9oi2yJetNZFcOZoOEhHgiexzo= ARC-Authentication-Results: i=2; imf13.hostedemail.com; dkim=pass header.d=amd.com header.s=selector1 header.b=favbM7BI; dmarc=pass (policy=quarantine) header.from=amd.com; spf=pass (imf13.hostedemail.com: domain of Raghavendra.KodsaraThimmappa@amd.com designates 40.107.244.45 as permitted sender) smtp.mailfrom=Raghavendra.KodsaraThimmappa@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=1750744726; 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=jNZuoxVfvqVikHLgk9R6ICz6ag6HwvS891F4xfGb3wg=; b=HQnr4ejbhItaeSBFBdilRfsPdWVpOjdnUgkSsbWY7UtxWujmPLhvEKU290MrZJym0XqrDj kBnNW3qJsXn8yn2oCl5jxGEWUf5zs0NcVwnxOLSf+if8o++UgfammBxqOSdqKeaSmrJWYN su6NRtHYvvhaVjZUrkkmPgw8FE2jsf0= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=lQsMJFgfLR4/+ir36Vc8tL/5nIhEB5UphOUjEqkiM3OLYrW3ZNUnpKjdp3PZcrCr4Z0PTTVy45zW/ZTynGLmomlQnidKa2HtSphyyzfh5pivgfEKI2yjassSx9eK5DnbY3rKQY2BxOyDmNfbmoq3NfrIE8CRa21sEOy4ZBCcdw6u3Nyn3Jpxqwt0SFR0CJGvstr0NoPGML2OtBm1eYrVml3ns7xdHXPa54OlCo1htZuA1rbY/KVR+mnHIkwzjsBpc7ctBfSUxkQEc6K2uisCPlvAYxDCAqzfBUKSApECkcsl4e32Bu5m0ePJCQ8JgEJOV1lpVdOckJv1dcfe7ffmzA== 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=jNZuoxVfvqVikHLgk9R6ICz6ag6HwvS891F4xfGb3wg=; b=QTEeJfNzRPpAG0xqa6fSms7/YkLHd6cROvo/D8+XeITxyWEEG/bSDyp3byvnwI41Cf/427DAMR7sHvT1fgACtiXKhr2cd+4VpHKXXFW9RIhImAEkmT319YLJeVKNVIinyk15vi3iL4zRNUd3Ksz4dAcnMplaNxP313xM2nKGDPcUJ2ilAGZ714KVF5RdyKjjXoLZtHaOWO/S2n6ABWknFYmjY/JVtY8hzWoPpFxwKfR+GVxZSQXImwuPkSofWLy+vmAVk0p9pEjPEmTdJjvXOXBtcKctkVAA6fZMHZnnndyhcnUpCsGZhEzGSQdTcOP++7GWaPoDsQ/KOTbQjTO7oA== 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=jNZuoxVfvqVikHLgk9R6ICz6ag6HwvS891F4xfGb3wg=; b=favbM7BIDT78EHJ8C6c3btex3w6nC+66JxBS/xD2LJJuIlbK9MNhbucHgBRZV+zA0+xjNsRRUO1ED1eY6kjvkIH4hZgIBkgp9wO/GvvwjYzFrhv0ivKDuICz2qIoOzVUoxI44xQgahinPPmyt8L7hhBWAfLTWgQDYBxKUyJk6U8= Received: from MW4PR03CA0347.namprd03.prod.outlook.com (2603:10b6:303:dc::22) by PH7PR12MB6561.namprd12.prod.outlook.com (2603:10b6:510:213::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8857.31; Tue, 24 Jun 2025 05:58:40 +0000 Received: from SJ5PEPF00000209.namprd05.prod.outlook.com (2603:10b6:303:dc:cafe::98) by MW4PR03CA0347.outlook.office365.com (2603:10b6:303:dc::22) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.8857.30 via Frontend Transport; Tue, 24 Jun 2025 05:58:40 +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 SJ5PEPF00000209.mail.protection.outlook.com (10.167.244.42) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8880.14 via Frontend Transport; Tue, 24 Jun 2025 05:58:39 +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; Tue, 24 Jun 2025 00:58:28 -0500 From: Raghavendra K T To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH V2 10/13] sysfs: Add sysfs support to tune scanning Date: Tue, 24 Jun 2025 05:56:14 +0000 Message-ID: <20250624055617.1291159-11-raghavendra.kt@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250624055617.1291159-1-raghavendra.kt@amd.com> References: <20250624055617.1291159-1-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: SJ5PEPF00000209:EE_|PH7PR12MB6561:EE_ X-MS-Office365-Filtering-Correlation-Id: abac8816-6768-463e-281b-08ddb2e42b05 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|376014|36860700013|1800799024|7416014; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?+7ROxtvCMLSpdqqt6YA2D+WFWNj+f925KGHuMB6io0M+wZpnY5cQDVnDauX8?= =?us-ascii?Q?VI2BSOPVav77tPVhD5IeXIDyjbdYo3rxEi0J1NJi3FKTsv1XtMx/4yNw+oNp?= =?us-ascii?Q?XFcsV+o88uBEtk8uyMYFh/xZi7u/Df1hC9cEdD/DMKtCVOeZBPA3WWSycEar?= =?us-ascii?Q?81nO5KqFmCtKa6QG2Mqwq9/WNFZ+92yo/WGS992/Rs6XGgjQrWYrcSAucQMV?= =?us-ascii?Q?pn7cp96R8ns0gmZdcxvLHWG9RBJpaBO5UVHBv4jSg+9Ge8TU9Igwp5jAh6cA?= =?us-ascii?Q?JDagkwsoQ/HYpwJPSV96DZUCG6+h6Pj3Ky8c3V4ea2dVTmKaq3lpRpChZlRT?= =?us-ascii?Q?VeucUqId/XMfh8Tm2N1vQpgiPWNeOWNPUXvwovW/zJcxESqoETnRlK+ziflR?= =?us-ascii?Q?aKUrmPLuqyMotQsB2PdK/yUTwSSn4l17di/9Ls1T8CBNbVikXSkCvm7RdWBD?= =?us-ascii?Q?07bOvMSMo7AkPX64QOPLhVBPbl6vvONqfxd/EqDjt3XN57hYbU3x+OfqsfYw?= =?us-ascii?Q?4DK5EvVmlmbtpyYi5vmc6aKwq9C33FlRbAW/CmUxwoMHjLBchxQEdSKCd5Qg?= =?us-ascii?Q?usmL1O3lbsck0wGyF6WWZtWje+oIaS2Dk3clmPjmSNwdTkk7OQ9fXGRFKNHt?= =?us-ascii?Q?Ub38AqXqb51SBgujOiiSPKlnQxSxIVEr/nTYcCMP8gbjJgYYFhp+4ZWJP3k1?= =?us-ascii?Q?jSXUv/0U9vIBAcO7BCjQC23IFZw+iTglynrgY7U5xepK9qRYiabmUDXljSJH?= =?us-ascii?Q?1X2/dGt8oQ3n5ZzDVr2waeMxicEYAkSukiFRHd31hRqmr90vOBJc6oD6Dzz1?= =?us-ascii?Q?lhH9fRloDqy9oopPmDWKcvBoN3D7ATSN47cA7XQ2RzG5AmRW6ZLcJIzlT92o?= =?us-ascii?Q?gl6AVLfoVdYvwoj0xNF8Y4sovaID4lRBEdxRM5aRZdYXWTUadKzbbD337j2e?= =?us-ascii?Q?PabbJYXtiqe01b4WNiUBziQRbv7WJ63pevPoKlVS+8grKY6QOsihJASSS9PC?= =?us-ascii?Q?+Tq8gu3jFr3Ycli72VhESwT3V2MtqLNYXX55cQ/H6mdXQVDV7XdTPa+Oz5km?= =?us-ascii?Q?unE3W+GUAAEQB9ipr1yT941YJmiufndLj1OIiWebyekvag7mijUnyiTxH3Fi?= =?us-ascii?Q?xt/1ygE9u59Txjeup3MimFHo4PrkKMSZIW+Jpbu1sWuQHb1DVb0F/9OclSb4?= =?us-ascii?Q?9We3etwnSC7EljyBvlfDXdi8xA6U21/URRzBjkCVFjOTxnDKq7LQW4fmXwKk?= =?us-ascii?Q?8sqSvSnEtt1P4++dUL0Eo3S9jZLIGPBtv+BrHZzD5t02HtJqlbeed37ZToWQ?= =?us-ascii?Q?WFEF4yc79OrF/gNv1cazp/6VPLw3RzxanHCAyvIvWCHlUlb8Idms4xTL+i+3?= =?us-ascii?Q?Fm1tdtlVaOnvEAHuuFP1c/sR/3HyS/UM3bM708/1tc4PsSBMnGBsRVQw7Lm5?= =?us-ascii?Q?q8qUZ+DsjC/dblbZyWsYoHoKI8r76whxtmaDY50WEhIx7I0KoveahT0NZ9Q5?= =?us-ascii?Q?EdzdhPpTBWIc6aneVwzYdTjhlnLsEzle34TO?= 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)(376014)(36860700013)(1800799024)(7416014);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Jun 2025 05:58:39.9274 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: abac8816-6768-463e-281b-08ddb2e42b05 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: SJ5PEPF00000209.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6561 X-Rspam-User: X-Stat-Signature: woaztad9ad5y7fywgrbkqh9xwjc3zy5x X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 0D16E20006 X-HE-Tag: 1750744725-492493 X-HE-Meta: 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 0dm2jU06 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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: Support below tunables: scan_enable: turn on or turn off mm_struct scanning scan_period: initial scan_period (default: 2sec) scan_sleep_ms: sleep time between two successive round of scanning and migration. mms_to_scan: total mm_struct to scan before taking a pause. target_node: default regular node to which migration of accessed pages is done (this is only fall back mechnism, otherwise target_node heuristic is used). Signed-off-by: Raghavendra K T --- mm/kscand.c | 205 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) diff --git a/mm/kscand.c b/mm/kscand.c index 2996aaad65d6..abffcb868447 100644 --- a/mm/kscand.c +++ b/mm/kscand.c @@ -21,6 +21,7 @@ #include #include #include +#include #include #include "internal.h" @@ -171,6 +172,171 @@ static bool kscand_eligible_srcnid(int nid) return !node_is_toptier(nid); } +#ifdef CONFIG_SYSFS +static ssize_t scan_sleep_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_scan_sleep_ms); +} + +static ssize_t scan_sleep_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + kscand_scan_sleep_ms = msecs; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute scan_sleep_ms_attr = + __ATTR_RW(scan_sleep_ms); + +static ssize_t mm_scan_period_ms_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_mm_scan_period_ms); +} + +/* If a value less than MIN or greater than MAX asked for store value is clamped */ +static ssize_t mm_scan_period_ms_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int msecs, stored_msecs; + int err; + + err = kstrtouint(buf, 10, &msecs); + if (err) + return -EINVAL; + + stored_msecs = clamp(msecs, KSCAND_SCAN_PERIOD_MIN, KSCAND_SCAN_PERIOD_MAX); + + kscand_mm_scan_period_ms = stored_msecs; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute mm_scan_period_ms_attr = + __ATTR_RW(mm_scan_period_ms); + +static ssize_t mms_to_scan_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%lu\n", kscand_mms_to_scan); +} + +static ssize_t mms_to_scan_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val; + int err; + + err = kstrtoul(buf, 10, &val); + if (err) + return -EINVAL; + + kscand_mms_to_scan = val; + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute mms_to_scan_attr = + __ATTR_RW(mms_to_scan); + +static ssize_t scan_enabled_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_scan_enabled ? 1 : 0); +} + +static ssize_t scan_enabled_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + unsigned int val; + int err; + + err = kstrtouint(buf, 10, &val); + if (err || val > 1) + return -EINVAL; + + if (val) { + kscand_scan_enabled = true; + need_wakeup = true; + } else + kscand_scan_enabled = false; + + kscand_sleep_expire = 0; + wake_up_interruptible(&kscand_wait); + + return count; +} + +static struct kobj_attribute scan_enabled_attr = + __ATTR_RW(scan_enabled); + +static ssize_t target_node_show(struct kobject *kobj, + struct kobj_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, "%u\n", kscand_target_node); +} + +static ssize_t target_node_store(struct kobject *kobj, + struct kobj_attribute *attr, + const char *buf, size_t count) +{ + int err, node; + + err = kstrtoint(buf, 10, &node); + if (err) + return -EINVAL; + + kscand_sleep_expire = 0; + if (!node_is_toptier(node)) + return -EINVAL; + + kscand_target_node = node; + wake_up_interruptible(&kscand_wait); + + return count; +} +static struct kobj_attribute target_node_attr = + __ATTR_RW(target_node); + +static struct attribute *kscand_attr[] = { + &scan_sleep_ms_attr.attr, + &mm_scan_period_ms_attr.attr, + &mms_to_scan_attr.attr, + &scan_enabled_attr.attr, + &target_node_attr.attr, + NULL, +}; + +struct attribute_group kscand_attr_group = { + .attrs = kscand_attr, + .name = "kscand", +}; +#endif + static inline int kscand_has_work(void) { return !list_empty(&kscand_scan.mm_head); @@ -1164,11 +1330,45 @@ static int kscand(void *none) return 0; } +#ifdef CONFIG_SYSFS +extern struct kobject *mm_kobj; +static int __init kscand_init_sysfs(struct kobject **kobj) +{ + int err; + + err = sysfs_create_group(*kobj, &kscand_attr_group); + if (err) { + pr_err("failed to register kscand group\n"); + goto err_kscand_attr; + } + + return 0; + +err_kscand_attr: + sysfs_remove_group(*kobj, &kscand_attr_group); + return err; +} + +static void __init kscand_exit_sysfs(struct kobject *kobj) +{ + sysfs_remove_group(kobj, &kscand_attr_group); +} +#else +static inline int __init kscand_init_sysfs(struct kobject **kobj) +{ + return 0; +} +static inline void __init kscand_exit_sysfs(struct kobject *kobj) +{ +} +#endif + static inline void kscand_destroy(void) { kmem_cache_destroy(kscand_slot_cache); /* XXX: move below to kmigrated thread */ kmem_cache_destroy(kmigrated_slot_cache); + kscand_exit_sysfs(mm_kobj); } void __kscand_enter(struct mm_struct *mm) @@ -1354,6 +1554,10 @@ static int __init kscand_init(void) return -ENOMEM; } + err = kscand_init_sysfs(&mm_kobj); + if (err) + goto err_init_sysfs; + init_list(); err = start_kscand(); if (err) @@ -1370,6 +1574,7 @@ static int __init kscand_init(void) err_kscand: stop_kscand(); +err_init_sysfs: kscand_destroy(); return err; -- 2.34.1