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Tue, 2 May 2023 21:06:36 -0500 From: Raghavendra K T To: , CC: Ingo Molnar , Peter Zijlstra , "Mel Gorman" , Andrew Morton , "David Hildenbrand" , , Juri Lelli , Vincent Guittot , Bharata B Rao , Raghavendra K T Subject: [RFC PATCH V1 2/2] sched/numa: Introduce per vma numa_scan_seq Date: Wed, 3 May 2023 07:35:49 +0530 Message-ID: X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 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: DM6NAM11FT009:EE_|PH7PR12MB7212:EE_ X-MS-Office365-Filtering-Correlation-Id: 99af254d-92aa-494e-3ffa-08db4b7b091a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 9hpY/bkoeOJl1NcUKrxEdLPh9lQKx9iqVb2oNVuzDoywOQIZHA+rCjlXhKg3SMeLC3lCKbVze8kmykuUzXAYXwQSZqHQ9Fo5bIsC+JUnWCOfc1XWPhp7MHiVJ8lZmKM1yas2RxUXOjsTAZL4FciCQnmpWmmbnkDrTCPh7WAczWat/kRpZ0ovsNaOQF/TVTQ5hC+nuntpT2Y30q0KMLBt+TCJiIsGAvZCokns9qxtMw8CDqw/iSxrIcWU5ScnWsXh+i0tckJCmTxR2SKjTxKN2fxFS9qdsUHjHl09yQQHifvGtEkGgXWMCRxePvnP08ZWBdUhXUKfQEP1m8IWyK7C/YDsdb+sLoY1WU9zOCOvSbaT8NLrM6uAoqnfEGH8HS2jDGDP6oacBO84cckiCwTmq4YQ3S61e5vIcJ2Uwq2kYo2y1wxeACwOz93yYhgra6CENGidFmjc1HvSsjkGeU6/sOgKuk+9kqwdEY/S0fwaCjaYmXHtSI5YvulSi4voGFFr0C09eNiWSSOCf1s0ectK4L2EE1W9yIfrm6gp2ix3Q5LmBESlDN6rBbEEHz4qVL73Gz/ccI7e72E4Ynnnyrh6mHjYAh4ceAKeOKmS8Nz/9Um5NuEWcs47Z+hFMk8XdXtox3XnJKiZ58c3ujGzQ5wWU8y9OD9S2i3aUSP3lvrf28/Gd7TfjCWAz7W2VfWDiVEO43lcBnHb2XlCBXR6RGvnoESFs38VTOlOE2nGonN8K2jkEJ9jZIKv+E/LFdX+OlLY 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:(13230028)(4636009)(136003)(39860400002)(376002)(396003)(346002)(451199021)(36840700001)(46966006)(40470700004)(4326008)(82310400005)(26005)(40460700003)(40480700001)(316002)(7416002)(8936002)(8676002)(16526019)(5660300002)(478600001)(36860700001)(186003)(70206006)(54906003)(70586007)(336012)(47076005)(426003)(83380400001)(41300700001)(110136005)(2616005)(356005)(36756003)(81166007)(2906002)(7696005)(6666004)(82740400003)(2101003)(36900700001);DIR:OUT;SFP:1101; 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But that counter needs reset regularly. Reset is achieved after full round of mm scanning by per vma numa_scan_sequence that follows mm->numa_scan_seq. Result: With this patch series we recover mmtest's numa01_THREAD_ALLOC performance as below Base 11-apr-next w/numascan w/o numascan numascan+patch real 1m33.579s 1m2.042s 1m11.738s user 280m46.032s 213m38.647s 231m40.226s sys 0m18.061s 6m54.963s 4m43.174s In summary: it adds back some system overhaed of scanning disjoint vma scanning, But still we are at huge advantage w.r.t base kernel Signed-off-by: Raghavendra K T --- include/linux/mm_types.h | 1 + kernel/sched/fair.c | 18 ++++++++++++++++-- 2 files changed, 17 insertions(+), 2 deletions(-) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index f66e6b4e0620..9c0fc83118da 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -479,6 +479,7 @@ struct vma_numab_state { unsigned long next_scan; unsigned long next_pid_reset; unsigned long access_pids[2]; + unsigned int vma_scan_seq; unsigned int scan_counter; }; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3c50dc3893eb..dc011a2a31ac 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2935,6 +2935,7 @@ static bool vma_is_accessed(struct vm_area_struct *vma) { unsigned long pids; unsigned int windows; + unsigned int mm_seq, vma_seq; unsigned int scan_size = READ_ONCE(sysctl_numa_balancing_scan_size); if (scan_size < MAX_SCAN_WINDOW) @@ -2945,6 +2946,18 @@ static bool vma_is_accessed(struct vm_area_struct *vma) windows = max(VMA_DISJOINT_SET_ACCESS_THRESH, windows); + mm_seq = READ_ONCE(current->mm->numa_scan_seq); + vma_seq = READ_ONCE(vma->numab_state->vma_scan_seq); + + if (vma_seq != mm_seq) { + /* + * One more round of whole mm scan was done. Reset the vma scan_counter + * and sync per vma numa_scan_seq. + */ + WRITE_ONCE(vma->numab_state->vma_scan_seq, + READ_ONCE(current->mm->numa_scan_seq)); + WRITE_ONCE(vma->numab_state->scan_counter, 0); + } /* * Make sure to allow scanning of disjoint vma set for the first * few times. @@ -2954,8 +2967,7 @@ static bool vma_is_accessed(struct vm_area_struct *vma) * This is also done to avoid any side effect of task scanning * amplifying the unfairness of disjoint set of VMAs' access. */ - if (READ_ONCE(vma->numab_state->scan_counter) < windows || - READ_ONCE(current->mm->numa_scan_seq) < 2) + if (READ_ONCE(vma->numab_state->scan_counter) < windows || mm_seq < 2) return true; pids = vma->numab_state->access_pids[0] | vma->numab_state->access_pids[1]; @@ -3078,6 +3090,8 @@ static void task_numa_work(struct callback_head *work) vma->numab_state->next_pid_reset = vma->numab_state->next_scan + msecs_to_jiffies(VMA_PID_RESET_PERIOD); + WRITE_ONCE(vma->numab_state->vma_scan_seq, + READ_ONCE(current->mm->numa_scan_seq)); WRITE_ONCE(vma->numab_state->scan_counter, 0); }