From: Christoph Lameter <cl@linux.com> To: Chris Metcalf <cmetcalf@mellanox.com> Cc: Gilad Ben Yossef <giladb@mellanox.com>, Steven Rostedt <rostedt@goodmis.org>, Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>, Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, Tejun Heo <tj@kernel.org>, Frederic Weisbecker <fweisbec@gmail.com>, Thomas Gleixner <tglx@linutronix.de>, "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>, Viresh Kumar <viresh.kumar@linaro.org>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Andy Lutomirski <luto@amacapital.net>, Daniel Lezcano <daniel.lezcano@linaro.org>, linux-doc@vger.kernel.org, linux-api@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v13 00/12] support "task_isolation" mode Date: Wed, 20 Jul 2016 21:04:03 -0500 (CDT) [thread overview] Message-ID: <alpine.DEB.2.20.1607202059180.25838@east.gentwo.org> (raw) In-Reply-To: <1468529299-27929-1-git-send-email-cmetcalf@mellanox.com> We are trying to test the patchset on x86 and are getting strange backtraces and aborts. It seems that the cpu before the cpu we are running on creates an irq_work event that causes a latency event on the next cpu. This is weird. Is there a new round robin IPI feature in the kernel that I am not aware of? Backtraces from dmesg: [ 956.603223] latencytest/7928: task_isolation mode lost due to irq_work [ 956.610817] cpu 12: irq_work violating task isolation for latencytest/7928 on cpu 13 [ 956.619985] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 4.7.0-rc7-stream1 #1 [ 956.628765] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 2.0.2 03/15/2016 [ 956.637642] 0000000000000086 ce6735c7b39e7b81 ffff88103e783d00 ffffffff8134f6ff [ 956.646739] ffff88102c50d700 000000000000000d ffff88103e783d28 ffffffff811986f4 [ 956.655828] ffff88102c50d700 ffff88203cf97f80 000000000000000d ffff88103e783d68 [ 956.664924] Call Trace: [ 956.667945] <IRQ> [<ffffffff8134f6ff>] dump_stack+0x63/0x84 [ 956.674740] [<ffffffff811986f4>] task_isolation_debug_task+0xb4/0xd0 [ 956.682229] [<ffffffff810b4a13>] _task_isolation_debug+0x83/0xc0 [ 956.689331] [<ffffffff81179c0c>] irq_work_queue_on+0x9c/0x120 [ 956.696142] [<ffffffff811075e4>] tick_nohz_full_kick_cpu+0x44/0x50 [ 956.703438] [<ffffffff810b48d9>] wake_up_nohz_cpu+0x99/0x110 [ 956.710150] [<ffffffff810f57e1>] internal_add_timer+0x71/0xb0 [ 956.716959] [<ffffffff810f696b>] add_timer_on+0xbb/0x140 [ 956.723283] [<ffffffff81100ca0>] clocksource_watchdog+0x230/0x300 [ 956.730480] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 956.738555] [<ffffffff810f5615>] call_timer_fn+0x35/0x120 [ 956.744973] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 956.753046] [<ffffffff810f64cc>] run_timer_softirq+0x23c/0x2f0 [ 956.759952] [<ffffffff816d4397>] __do_softirq+0xd7/0x2c5 [ 956.766272] [<ffffffff81091245>] irq_exit+0xf5/0x100 [ 956.772209] [<ffffffff816d41d2>] smp_apic_timer_interrupt+0x42/0x50 [ 956.779600] [<ffffffff816d231c>] apic_timer_interrupt+0x8c/0xa0 [ 956.786602] <EOI> [<ffffffff81569eb0>] ? poll_idle+0x40/0x80 [ 956.793490] [<ffffffff815697dc>] cpuidle_enter_state+0x9c/0x260 [ 956.800498] [<ffffffff815699d7>] cpuidle_enter+0x17/0x20 [ 956.806810] [<ffffffff810cf497>] cpu_startup_entry+0x2b7/0x3a0 [ 956.813717] [<ffffffff81050e6c>] start_secondary+0x15c/0x1a0 [ 1036.601758] cpu 12: irq_work violating task isolation for latencytest/8447 on cpu 13 [ 1036.610922] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 4.7.0-rc7-stream1 #1 [ 1036.619692] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 2.0.2 03/15/2016 [ 1036.628551] 0000000000000086 ce6735c7b39e7b81 ffff88103e783d00 ffffffff8134f6ff [ 1036.637648] ffff88102dca0000 000000000000000d ffff88103e783d28 ffffffff811986f4 [ 1036.646741] ffff88102dca0000 ffff88203cf97f80 000000000000000d ffff88103e783d68 [ 1036.655833] Call Trace: [ 1036.658852] <IRQ> [<ffffffff8134f6ff>] dump_stack+0x63/0x84 [ 1036.665649] [<ffffffff811986f4>] task_isolation_debug_task+0xb4/0xd0 [ 1036.673136] [<ffffffff810b4a13>] _task_isolation_debug+0x83/0xc0 [ 1036.680237] [<ffffffff81179c0c>] irq_work_queue_on+0x9c/0x120 [ 1036.687091] [<ffffffff811075e4>] tick_nohz_full_kick_cpu+0x44/0x50 [ 1036.694388] [<ffffffff810b48d9>] wake_up_nohz_cpu+0x99/0x110 [ 1036.701089] [<ffffffff810f57e1>] internal_add_timer+0x71/0xb0 [ 1036.707896] [<ffffffff810f696b>] add_timer_on+0xbb/0x140 [ 1036.714210] [<ffffffff81100ca0>] clocksource_watchdog+0x230/0x300 [ 1036.721411] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 1036.729478] [<ffffffff810f5615>] call_timer_fn+0x35/0x120 [ 1036.735899] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 1036.743970] [<ffffffff810f64cc>] run_timer_softirq+0x23c/0x2f0 [ 1036.750878] [<ffffffff816d4397>] __do_softirq+0xd7/0x2c5 [ 1036.757199] [<ffffffff81091245>] irq_exit+0xf5/0x100 [ 1036.763132] [<ffffffff816d41d2>] smp_apic_timer_interrupt+0x42/0x50 [ 1036.770520] [<ffffffff816d231c>] apic_timer_interrupt+0x8c/0xa0 [ 1036.777520] <EOI> [<ffffffff81569eb0>] ? poll_idle+0x40/0x80 [ 1036.784410] [<ffffffff815697dc>] cpuidle_enter_state+0x9c/0x260 [ 1036.791413] [<ffffffff815699d7>] cpuidle_enter+0x17/0x20 [ 1036.797734] [<ffffffff810cf497>] cpu_startup_entry+0x2b7/0x3a0 [ 1036.804641] [<ffffffff81050e6c>] start_secondary+0x15c/0x1a0
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org> To: Chris Metcalf <cmetcalf-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> Cc: Gilad Ben Yossef <giladb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>, Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>, Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, "Paul E. McKenney" <paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>, Viresh Kumar <viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>, Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, Daniel Lezcano <daniel.lezcano-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Subject: Re: [PATCH v13 00/12] support "task_isolation" mode Date: Wed, 20 Jul 2016 21:04:03 -0500 (CDT) [thread overview] Message-ID: <alpine.DEB.2.20.1607202059180.25838@east.gentwo.org> (raw) In-Reply-To: <1468529299-27929-1-git-send-email-cmetcalf-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org> We are trying to test the patchset on x86 and are getting strange backtraces and aborts. It seems that the cpu before the cpu we are running on creates an irq_work event that causes a latency event on the next cpu. This is weird. Is there a new round robin IPI feature in the kernel that I am not aware of? Backtraces from dmesg: [ 956.603223] latencytest/7928: task_isolation mode lost due to irq_work [ 956.610817] cpu 12: irq_work violating task isolation for latencytest/7928 on cpu 13 [ 956.619985] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 4.7.0-rc7-stream1 #1 [ 956.628765] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 2.0.2 03/15/2016 [ 956.637642] 0000000000000086 ce6735c7b39e7b81 ffff88103e783d00 ffffffff8134f6ff [ 956.646739] ffff88102c50d700 000000000000000d ffff88103e783d28 ffffffff811986f4 [ 956.655828] ffff88102c50d700 ffff88203cf97f80 000000000000000d ffff88103e783d68 [ 956.664924] Call Trace: [ 956.667945] <IRQ> [<ffffffff8134f6ff>] dump_stack+0x63/0x84 [ 956.674740] [<ffffffff811986f4>] task_isolation_debug_task+0xb4/0xd0 [ 956.682229] [<ffffffff810b4a13>] _task_isolation_debug+0x83/0xc0 [ 956.689331] [<ffffffff81179c0c>] irq_work_queue_on+0x9c/0x120 [ 956.696142] [<ffffffff811075e4>] tick_nohz_full_kick_cpu+0x44/0x50 [ 956.703438] [<ffffffff810b48d9>] wake_up_nohz_cpu+0x99/0x110 [ 956.710150] [<ffffffff810f57e1>] internal_add_timer+0x71/0xb0 [ 956.716959] [<ffffffff810f696b>] add_timer_on+0xbb/0x140 [ 956.723283] [<ffffffff81100ca0>] clocksource_watchdog+0x230/0x300 [ 956.730480] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 956.738555] [<ffffffff810f5615>] call_timer_fn+0x35/0x120 [ 956.744973] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 956.753046] [<ffffffff810f64cc>] run_timer_softirq+0x23c/0x2f0 [ 956.759952] [<ffffffff816d4397>] __do_softirq+0xd7/0x2c5 [ 956.766272] [<ffffffff81091245>] irq_exit+0xf5/0x100 [ 956.772209] [<ffffffff816d41d2>] smp_apic_timer_interrupt+0x42/0x50 [ 956.779600] [<ffffffff816d231c>] apic_timer_interrupt+0x8c/0xa0 [ 956.786602] <EOI> [<ffffffff81569eb0>] ? poll_idle+0x40/0x80 [ 956.793490] [<ffffffff815697dc>] cpuidle_enter_state+0x9c/0x260 [ 956.800498] [<ffffffff815699d7>] cpuidle_enter+0x17/0x20 [ 956.806810] [<ffffffff810cf497>] cpu_startup_entry+0x2b7/0x3a0 [ 956.813717] [<ffffffff81050e6c>] start_secondary+0x15c/0x1a0 [ 1036.601758] cpu 12: irq_work violating task isolation for latencytest/8447 on cpu 13 [ 1036.610922] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 4.7.0-rc7-stream1 #1 [ 1036.619692] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 2.0.2 03/15/2016 [ 1036.628551] 0000000000000086 ce6735c7b39e7b81 ffff88103e783d00 ffffffff8134f6ff [ 1036.637648] ffff88102dca0000 000000000000000d ffff88103e783d28 ffffffff811986f4 [ 1036.646741] ffff88102dca0000 ffff88203cf97f80 000000000000000d ffff88103e783d68 [ 1036.655833] Call Trace: [ 1036.658852] <IRQ> [<ffffffff8134f6ff>] dump_stack+0x63/0x84 [ 1036.665649] [<ffffffff811986f4>] task_isolation_debug_task+0xb4/0xd0 [ 1036.673136] [<ffffffff810b4a13>] _task_isolation_debug+0x83/0xc0 [ 1036.680237] [<ffffffff81179c0c>] irq_work_queue_on+0x9c/0x120 [ 1036.687091] [<ffffffff811075e4>] tick_nohz_full_kick_cpu+0x44/0x50 [ 1036.694388] [<ffffffff810b48d9>] wake_up_nohz_cpu+0x99/0x110 [ 1036.701089] [<ffffffff810f57e1>] internal_add_timer+0x71/0xb0 [ 1036.707896] [<ffffffff810f696b>] add_timer_on+0xbb/0x140 [ 1036.714210] [<ffffffff81100ca0>] clocksource_watchdog+0x230/0x300 [ 1036.721411] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 1036.729478] [<ffffffff810f5615>] call_timer_fn+0x35/0x120 [ 1036.735899] [<ffffffff81100a70>] ? __clocksource_unstable.isra.2+0x40/0x40 [ 1036.743970] [<ffffffff810f64cc>] run_timer_softirq+0x23c/0x2f0 [ 1036.750878] [<ffffffff816d4397>] __do_softirq+0xd7/0x2c5 [ 1036.757199] [<ffffffff81091245>] irq_exit+0xf5/0x100 [ 1036.763132] [<ffffffff816d41d2>] smp_apic_timer_interrupt+0x42/0x50 [ 1036.770520] [<ffffffff816d231c>] apic_timer_interrupt+0x8c/0xa0 [ 1036.777520] <EOI> [<ffffffff81569eb0>] ? poll_idle+0x40/0x80 [ 1036.784410] [<ffffffff815697dc>] cpuidle_enter_state+0x9c/0x260 [ 1036.791413] [<ffffffff815699d7>] cpuidle_enter+0x17/0x20 [ 1036.797734] [<ffffffff810cf497>] cpu_startup_entry+0x2b7/0x3a0 [ 1036.804641] [<ffffffff81050e6c>] start_secondary+0x15c/0x1a0
next prev parent reply other threads:[~2016-07-21 2:04 UTC|newest] Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-14 20:48 [PATCH v13 00/12] support "task_isolation" mode Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 01/12] vmstat: add quiet_vmstat_sync function Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 02/12] vmstat: add vmstat_idle function Chris Metcalf 2016-07-14 20:48 ` Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 03/12] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf 2016-07-14 20:48 ` Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 04/12] task_isolation: add initial support Chris Metcalf 2016-07-14 20:48 ` Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 05/12] task_isolation: track asynchronous interrupts Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 06/12] arch/x86: enable task isolation functionality Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 07/12] arm64: factor work_pending state machine to C Chris Metcalf 2016-07-14 20:48 ` Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 08/12] arch/arm64: enable task isolation functionality Chris Metcalf 2016-07-14 20:48 ` Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 09/12] arch/tile: " Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 10/12] arm, tile: turn off timer tick for oneshot_stopped state Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 11/12] task_isolation: support CONFIG_TASK_ISOLATION_ALL Chris Metcalf 2016-07-14 20:48 ` [PATCH v13 12/12] task_isolation: add user-settable notification signal Chris Metcalf 2016-07-14 21:03 ` [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski 2016-07-14 21:03 ` Andy Lutomirski 2016-07-14 21:22 ` Chris Metcalf 2016-07-14 21:22 ` Chris Metcalf 2016-07-18 22:11 ` Andy Lutomirski 2016-07-18 22:50 ` Chris Metcalf 2016-07-18 0:42 ` Christoph Lameter 2016-07-18 0:42 ` Christoph Lameter 2016-07-21 2:04 ` Christoph Lameter [this message] 2016-07-21 2:04 ` Christoph Lameter 2016-07-21 14:06 ` Chris Metcalf 2016-07-21 14:06 ` Chris Metcalf 2016-07-22 2:20 ` Christoph Lameter 2016-07-22 12:50 ` Chris Metcalf 2016-07-22 12:50 ` Chris Metcalf 2016-07-25 16:35 ` Christoph Lameter 2016-07-27 13:55 ` clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode) Christoph Lameter 2016-07-27 13:55 ` Christoph Lameter 2016-07-27 14:12 ` Chris Metcalf 2016-07-27 14:12 ` Chris Metcalf 2016-07-27 15:23 ` Christoph Lameter 2016-07-27 15:23 ` Christoph Lameter 2016-07-27 15:31 ` Christoph Lameter 2016-07-27 15:31 ` Christoph Lameter 2016-07-27 17:06 ` Chris Metcalf 2016-07-27 17:06 ` Chris Metcalf 2016-07-27 18:56 ` Christoph Lameter 2016-07-27 19:49 ` Chris Metcalf 2016-07-27 19:49 ` Chris Metcalf 2016-07-27 19:53 ` Christoph Lameter 2016-07-27 19:58 ` Chris Metcalf 2016-07-27 19:58 ` Chris Metcalf 2016-07-29 18:31 ` Francis Giraldeau 2016-07-29 18:31 ` Francis Giraldeau 2016-07-29 21:04 ` Chris Metcalf 2016-07-29 21:04 ` Chris Metcalf 2016-08-10 22:16 ` Frederic Weisbecker 2016-08-10 22:26 ` Chris Metcalf 2016-08-10 22:26 ` Chris Metcalf 2016-08-11 8:40 ` Peter Zijlstra 2016-08-11 11:58 ` Frederic Weisbecker 2016-08-15 15:03 ` Chris Metcalf 2016-08-15 15:03 ` Chris Metcalf 2016-08-11 16:00 ` Paul E. McKenney 2016-08-11 23:02 ` Christoph Lameter 2016-08-11 23:47 ` Paul E. McKenney 2016-08-12 14:23 ` Christoph Lameter 2016-08-12 14:26 ` Frederic Weisbecker 2016-08-12 14:26 ` Frederic Weisbecker 2016-08-12 16:19 ` Paul E. McKenney 2016-08-13 15:39 ` Frederic Weisbecker 2016-08-13 15:39 ` Frederic Weisbecker 2016-08-11 8:27 ` [PATCH v13 00/12] support "task_isolation" mode Peter Zijlstra 2016-07-27 14:01 ` Christoph Lameter
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