Messages in this thread | | | Subject | Re: [PATCH] x86, mce, therm_throt: Optimize notifications of thermal throttle | From | Srinivas Pandruvada <> | Date | Sat, 08 Feb 2020 22:09:49 -0800 |
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On Sat, 2020-02-08 at 22:24 +0000, Chris Wilson wrote: > Quoting Srinivas Pandruvada (2019-11-11 21:43:12) > > +static void throttle_active_work(struct work_struct *work) > > +{ > > + struct _thermal_state *state = > > container_of(to_delayed_work(work), > > + struct > > _thermal_state, therm_work); > > + unsigned int i, avg, this_cpu = smp_processor_id(); > > + u64 now = get_jiffies_64(); > > + bool hot; > > + u8 temp; > > <6> [198.901895] [IGT] perf_pmu: starting subtest cpu-hotplug > <4> [199.088851] IRQ 24: no longer affine to CPU0 > <4> [199.088871] IRQ 25: no longer affine to CPU0 > <6> [199.091679] smpboot: CPU 0 is now offline > <6> [200.122204] smpboot: Booting Node 0 Processor 0 APIC 0x0 > <6> [200.297267] smpboot: CPU 1 is now offline > <3> [201.218812] BUG: using smp_processor_id() in preemptible > [00000000] code: kworker/1:0/17 > <4> [201.218974] caller is throttle_active_work+0x12/0x280 > <4> [201.218985] CPU: 0 PID: 17 Comm: kworker/1:0 Tainted: > G U 5.5.0-CI-CI_DRM_7867+ #1 > <4> [201.218991] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS > V1.12 02/15/2016 > <4> [201.219001] Workqueue: events throttle_active_work > <4> [201.219009] Call Trace: > <4> [201.219021] dump_stack+0x71/0x9b > <4> [201.219035] debug_smp_processor_id+0xad/0xb0 > <4> [201.219047] throttle_active_work+0x12/0x280 > <4> [201.219063] process_one_work+0x26a/0x620 > <4> [201.219087] worker_thread+0x37/0x380 > <4> [201.219103] ? process_one_work+0x620/0x620 > <4> [201.219110] kthread+0x119/0x130 > <4> [201.219119] ? kthread_park+0x80/0x80 > <4> [201.219134] ret_from_fork+0x3a/0x50 > <6> [201.315866] x86: Booting SMP configuration: > <6> [201.315880] smpboot: Booting Node 0 Processor 1 APIC 0x2 > <4> [201.319814] ------------[ cut here ]------------ > <3> [201.319832] ODEBUG: init active (active state 0) object type: > timer_list hint: delayed_work_timer_fn+0x0/0x10 > <4> [201.319971] WARNING: CPU: 1 PID: 14 at lib/debugobjects.c:484 > debug_print_object+0x67/0x90 > <4> [201.319977] Modules linked in: vgem snd_hda_codec_hdmi i915 > mei_hdcp x86_pkg_temp_thermal coretemp snd_hda_codec_realtek > crct10dif_pclmul snd_hda_codec_generic crc32_pclmul snd_hda_intel > snd_intel_dspcfg snd_hda_codec ghash_clmulni_intel snd_hwdep > snd_hda_core snd_pcm mei_me r8169 mei realtek lpc_ich prime_numbers > <4> [201.320023] CPU: 1 PID: 14 Comm: cpuhp/1 Tainted: > G U 5.5.0-CI-CI_DRM_7867+ #1 > <4> [201.320029] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS > V1.12 02/15/2016 > <4> [201.320038] RIP: 0010:debug_print_object+0x67/0x90 > <4> [201.320046] Code: 83 c2 01 8b 4b 14 4c 8b 45 00 89 15 17 f7 8b > 02 8b 53 10 4c 89 e6 48 c7 c7 b0 ce 31 82 48 8b 14 d5 00 37 07 82 e8 > 89 7b b8 ff <0f> 0b 5b 83 05 33 fb 21 01 01 5d 41 5c c3 83 05 28 fb > 21 01 01 c3 > <4> [201.320053] RSP: 0000:ffffc900000dbd40 EFLAGS: 00010286 > <4> [201.320060] RAX: 0000000000000000 RBX: ffff888408665d68 RCX: > 0000000000000001 > <4> [201.320066] RDX: 0000000080000001 RSI: ffff88840d6e30f8 RDI: > 00000000ffffffff > <4> [201.320072] RBP: ffffffff826489e0 R08: ffff88840d6e30f8 R09: > 0000000000000000 > <4> [201.320078] R10: 0000000000000000 R11: 0000000000000000 R12: > ffffffff822d7bd1 > <4> [201.320084] R13: ffffffff826489e0 R14: ffff88840f898300 R15: > 0000000000000202 > <4> [201.320091] FS: 0000000000000000(0000) > GS:ffff88840f880000(0000) knlGS:0000000000000000 > <4> [201.320098] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > <4> [201.320104] CR2: 0000000000000000 CR3: 0000000005610001 CR4: > 00000000001606e0 > <4> [201.320109] Call Trace: > <4> [201.320125] __debug_object_init+0x359/0x510 > <4> [201.320140] ? _raw_spin_unlock_irqrestore+0x34/0x60 > <4> [201.320156] ? queue_work_node+0x70/0x70 > <4> [201.320165] init_timer_key+0x25/0x140 > <4> [201.320180] ? intel_thermal_supported+0x30/0x30 > <4> [201.320191] thermal_throttle_online+0xb4/0x260 > <4> [201.320204] ? unexpected_thermal_interrupt+0x20/0x20 > <4> [201.320213] cpuhp_invoke_callback+0x9b/0x9d0 > <4> [201.320235] cpuhp_thread_fun+0x1c8/0x220 > <4> [201.320249] ? smpboot_thread_fn+0x23/0x280 > <4> [201.320259] ? smpboot_thread_fn+0x6b/0x280 > <4> [201.320271] smpboot_thread_fn+0x1d3/0x280 > <4> [201.320288] ? sort_range+0x20/0x20 > <4> [201.320295] kthread+0x119/0x130 > <4> [201.320303] ? kthread_park+0x80/0x80 > <4> [201.320317] ret_from_fork+0x3a/0x50 > <4> [201.320348] irq event stamp: 4846 > <4> [201.320358] hardirqs last enabled at (4845): > [<ffffffff8112dcca>] console_unlock+0x4ba/0x5a0 > <4> [201.320368] hardirqs last disabled at (4846): > [<ffffffff81001ca0>] trace_hardirqs_off_thunk+0x1a/0x1c > <4> [201.320379] softirqs last enabled at (4746): > [<ffffffff81e00385>] __do_softirq+0x385/0x47f > <4> [201.320388] softirqs last disabled at (4739): > [<ffffffff810ba15a>] irq_exit+0xba/0xc0 > <4> [201.320394] ---[ end trace 06576bf31ad2ac2b ]--- > > Are we otherwise relying on current->nr_cpus_allowed == 1 here? No. I am checking internally, if I can use raw_smp_processor_id() instead.
Thanks, Srinivas
> (As this section is not within a preempt_disable or local_irq_disable > region.) > -Chris
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