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b=LLE+HkvtximrnyHkzcpaA5gpSzuId1f7/EftRG1u2Yv26jNLFlVJe4oq0TnMU0f8WGssDa2h2NnIy1HT6JuImo9aQslksLgAN/tIAUmvJdQAzE86RAs0wgF/3PLY4m7nbtJuoE8qenUyEq/L1gRzIahY5GzcqFHBVzr42ixL7WE= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from CH3PR12MB8658.namprd12.prod.outlook.com (2603:10b6:610:175::8) by DS7PR12MB6263.namprd12.prod.outlook.com (2603:10b6:8:95::17) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8901.20; Fri, 4 Jul 2025 06:13:51 +0000 Received: from CH3PR12MB8658.namprd12.prod.outlook.com ([fe80::d5cc:cc84:5e00:2f42]) by CH3PR12MB8658.namprd12.prod.outlook.com ([fe80::d5cc:cc84:5e00:2f42%4]) with mapi id 15.20.8901.021; Fri, 4 Jul 2025 06:13:51 +0000 Message-ID: <0672c7df-543c-4f3e-829a-46969fad6b34@amd.com> Date: Fri, 4 Jul 2025 11:43:43 +0530 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 12/12] sched: Add ttwu_queue support for delayed tasks To: Peter Zijlstra , Phil Auld Cc: mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, clm@meta.com, linux-kernel@vger.kernel.org References: <20250702114924.091581796@infradead.org> <20250702121159.652969404@infradead.org> <20250703160027.GC245663@pauld.westford.csb> <20250703164708.GZ1613200@noisy.programming.kicks-ass.net> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20250703164708.GZ1613200@noisy.programming.kicks-ass.net> Content-Type: text/plain; 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But I don't > remember build failures here. Running HammerDB + MySQL on baremetal results in a splats from assert_clock_updated() ~10min into the run on peterz:sched/core at commit 098ac7dd8a57 ("sched: Add ttwu_queue support for delayed tasks") which I hope is the updated one. I'm running with the following diff and haven't seen a splat yet (slightly longer than 10min into HammerDB; still testing): diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 9855121c2440..71ac0e7effeb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -3871,7 +3871,7 @@ static int ttwu_delayed(struct rq *rq, struct task_struct *p, int wake_flags, if (unlikely(rq != p_rq)) { __task_rq_unlock(p_rq, rf); rq_lock(rq, rf); - update_rq_clock(p_rq); + update_rq_clock(rq); } p->sched_remote_wakeup = !!(wake_flags & WF_MIGRATED); --- P.S. The full set of splats are as follows: ------------[ cut here ]------------ WARNING: CPU: 141 PID: 8164 at kernel/sched/sched.h:1643 update_curr_se+0x5c/0x60 Modules linked in: ... CPU: 141 UID: 1000 PID: 8164 Comm: mysqld Tainted: G U 6.16.0-rc1-peterz-queue-098ac7+ #869 PREEMPT(voluntary) Tainted: [U]=USER Hardware name: Dell Inc. PowerEdge R6525/024PW1, BIOS 2.7.3 03/30/2022 RIP: 0010:update_curr_se+0x5c/0x60 Code: be a8 00 00 00 00 48 8d 96 80 02 00 00 74 07 48 8d 96 00 01 00 00 48 8b 4a 60 48 39 c1 48 0f 4c c8 48 89 4a 60 e9 1f af d5 ff <0f> 0b eb ae 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f RSP: 0000:ffffd162151ffd30 EFLAGS: 00010097 RAX: 0000000000000001 RBX: ffff8bb25c903500 RCX: ffffffff8afb3ca0 RDX: 0000000000000009 RSI: ffff8bb25c903500 RDI: ffff8bf07e571b00 RBP: ffff8bb25ea94400 R08: 0000014f849737b3 R09: 0000000000000009 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8bf07e571b00 R13: ffff8bf07e571b00 R14: ffff8bb25c903500 R15: ffff8bb25ea94400 FS: 00007fcd9e01f640(0000) GS:ffff8bf0f0858000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf3990c004 CR3: 0000000147f9900b CR4: 0000000000f70ef0 PKRU: 55555554 Call Trace: update_curr+0x31/0x240 enqueue_entity+0x2e/0x470 enqueue_task_fair+0x122/0x850 enqueue_task+0x88/0x1c0 ttwu_do_activate+0x75/0x230 sched_ttwu_pending+0x2b9/0x430 __flush_smp_call_function_queue+0x140/0x420 __sysvec_call_function_single+0x1c/0xb0 sysvec_call_function_single+0x43/0xb0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0033:0x202a6de Code: 89 f1 4d 89 c4 4d 8d 44 24 01 41 0f b6 50 ff 49 8d 71 01 44 0f b6 5e ff 89 d0 44 29 d8 0f 85 01 02 00 00 48 89 ca 48 83 ea 01 <0f> 84 0c 02 00 00 4c 39 c7 75 c7 48 89 4d 80 4c 89 55 88 4c 89 4d RSP: 002b:00007fcd9e01a1f0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 00007fc2684926c2 RDI: 00007fb96fe862b7 RBP: 00007fcd9e01a270 R08: 00007fb96fe862b5 R09: 00007fc2684926c1 R10: 0000000000000000 R11: 0000000000000000 R12: 00007fb96fe862b4 R13: 0000000000000000 R14: 00000000ffffffff R15: 00007fcd9e01a310 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 141 PID: 8164 at kernel/sched/sched.h:1643 update_load_avg+0x6f7/0x780 Modules linked in: ... CPU: 141 UID: 1000 PID: 8164 Comm: mysqld Tainted: G U W 6.16.0-rc1-peterz-queue-098ac7+ #869 PREEMPT(voluntary) Tainted: [U]=USER, [W]=WARN Hardware name: Dell Inc. PowerEdge R6525/024PW1, BIOS 2.7.3 03/30/2022 RIP: 0010:update_load_avg+0x6f7/0x780 Code: 42 f8 e9 c8 fa ff ff 39 c1 0f 42 c8 e9 4a fb ff ff 31 c0 45 31 c9 e9 cf fb ff ff 4c 8b a7 80 01 00 00 49 29 d4 e9 5a f9 ff ff <0f> 0b e9 42 f9 ff ff 69 d0 7e b6 00 00 e9 f4 fb ff ff 39 c2 0f 42 RSP: 0000:ffffd162151ffd20 EFLAGS: 00010097 RAX: ffff8bf07e571b00 RBX: ffff8bb25ea94400 RCX: 0000000000000041 RDX: 0000000000000000 RSI: ffff8bb237533500 RDI: ffff8bb25ea94400 RBP: ffff8bb237533500 R08: 000000000000132d R09: 0000000000000009 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8bf07e571b00 R13: 0000000000000005 R14: ffff8bb25c903500 R15: ffff8bb25ea94400 FS: 00007fcd9e01f640(0000) GS:ffff8bf0f0858000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf3990c004 CR3: 0000000147f9900b CR4: 0000000000f70ef0 PKRU: 55555554 Call Trace: ? srso_alias_return_thunk+0x5/0xfbef5 ? update_curr+0x1bd/0x240 enqueue_entity+0x3e/0x470 enqueue_task_fair+0x122/0x850 enqueue_task+0x88/0x1c0 ttwu_do_activate+0x75/0x230 sched_ttwu_pending+0x2b9/0x430 __flush_smp_call_function_queue+0x140/0x420 __sysvec_call_function_single+0x1c/0xb0 sysvec_call_function_single+0x43/0xb0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0033:0x202a6de Code: 89 f1 4d 89 c4 4d 8d 44 24 01 41 0f b6 50 ff 49 8d 71 01 44 0f b6 5e ff 89 d0 44 29 d8 0f 85 01 02 00 00 48 89 ca 48 83 ea 01 <0f> 84 0c 02 00 00 4c 39 c7 75 c7 48 89 4d 80 4c 89 55 88 4c 89 4d RSP: 002b:00007fcd9e01a1f0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 00007fc2684926c2 RDI: 00007fb96fe862b7 RBP: 00007fcd9e01a270 R08: 00007fb96fe862b5 R09: 00007fc2684926c1 R10: 0000000000000000 R11: 0000000000000000 R12: 00007fb96fe862b4 R13: 0000000000000000 R14: 00000000ffffffff R15: 00007fcd9e01a310 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: CPU: 141 PID: 8164 at kernel/sched/sched.h:1643 enqueue_task+0x168/0x1c0 Modules linked in: ... CPU: 141 UID: 1000 PID: 8164 Comm: mysqld Tainted: G U W 6.16.0-rc1-peterz-queue-098ac7+ #869 PREEMPT(voluntary) Tainted: [U]=USER, [W]=WARN Hardware name: Dell Inc. PowerEdge R6525/024PW1, BIOS 2.7.3 03/30/2022 RIP: 0010:enqueue_task+0x168/0x1c0 Code: ee 4c 89 e7 5d 41 5c 41 5d e9 24 d0 ff ff 41 f7 c5 00 02 00 00 0f 85 e4 fe ff ff e9 18 ff ff ff e8 3d f0 ff ff e9 b9 fe ff ff <0f> 0b eb ab 85 c0 74 10 80 fa 01 19 d2 83 e2 f6 83 c2 0e e9 7a ff RSP: 0000:ffffd162151ffe00 EFLAGS: 00010097 RAX: 000000003cc00001 RBX: ffff8bf07e571b00 RCX: 0000000000000000 RDX: 000000002721340a RSI: 0000014fabb84509 RDI: ffff8bf07e55cd80 RBP: ffff8bb237533480 R08: 0000014fabb84509 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000000 R12: ffff8bf07e571b00 R13: 0000000000000009 R14: ffffd162151ffe90 R15: 0000000000000008 FS: 00007fcd9e01f640(0000) GS:ffff8bf0f0858000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf3990c004 CR3: 0000000147f9900b CR4: 0000000000f70ef0 PKRU: 55555554 Call Trace: ttwu_do_activate+0x75/0x230 sched_ttwu_pending+0x2b9/0x430 __flush_smp_call_function_queue+0x140/0x420 __sysvec_call_function_single+0x1c/0xb0 sysvec_call_function_single+0x43/0xb0 asm_sysvec_call_function_single+0x1a/0x20 RIP: 0033:0x202a6de Code: 89 f1 4d 89 c4 4d 8d 44 24 01 41 0f b6 50 ff 49 8d 71 01 44 0f b6 5e ff 89 d0 44 29 d8 0f 85 01 02 00 00 48 89 ca 48 83 ea 01 <0f> 84 0c 02 00 00 4c 39 c7 75 c7 48 89 4d 80 4c 89 55 88 4c 89 4d RSP: 002b:00007fcd9e01a1f0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000003 RDX: 0000000000000002 RSI: 00007fc2684926c2 RDI: 00007fb96fe862b7 RBP: 00007fcd9e01a270 R08: 00007fb96fe862b5 R09: 00007fc2684926c1 R10: 0000000000000000 R11: 0000000000000000 R12: 00007fb96fe862b4 R13: 0000000000000000 R14: 00000000ffffffff R15: 00007fcd9e01a310 ---[ end trace 0000000000000000 ]--- -- Thanks and Regards, Prateek