From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>
Subject: Re: RFC: futex_wait() can DoS the tick
Date: Wed, 10 Jun 2015 19:30:21 +0200 [thread overview]
Message-ID: <1433957421.6306.28.camel@gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.11.1506101639230.3786@nanos>
On Wed, 2015-06-10 at 17:12 +0200, Thomas Gleixner wrote:
> Some more information about your symptoms in form of configuration,
> extra patches, kernel traces etc. would be appreciated.
homer:~/tmp # perf record -C 3 -eirq:*,irq_vectors:local* -- sleep 10
[ perf record: Woken up 2 times to write data ]
[ perf record: Captured and wrote 1380.507 MB perf.data (19530595 samples) ]
homer:~/tmp # perf script | grep irq_vectors:local_timer
ksoftirqd/3 19 [003] 5586.564238: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5586.564239: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5586.568238: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5586.568239: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5586.632218: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5586.632219: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5587.056069: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5587.056071: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5587.307978: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5587.307978: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5588.255633: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5588.255635: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5589.627132: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5589.627133: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5590.334877: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5590.334883: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5590.510815: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5590.510816: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5590.558794: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5590.558796: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5590.822707: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5590.822709: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5592.346152: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5592.346153: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5592.558074: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5592.558076: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5593.741647: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5593.741649: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5594.953208: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5594.953209: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5595.009197: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5595.009198: irq_vectors:local_timer_exit: vector=239
ksoftirqd/3 19 [003] 5595.397049: irq_vectors:local_timer_entry: vector=239
ksoftirqd/3 19 [003] 5595.397050: irq_vectors:local_timer_exit: vector=239
bnc886785_livel 9817 [003] 5595.473025: irq_vectors:local_timer_entry: vector=239
bnc886785_livel 9817 [003] 5595.473027: irq_vectors:local_timer_exit: vector=239
homer:~/tmp #
next prev parent reply other threads:[~2015-06-10 17:30 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-06-10 12:44 RFC: futex_wait() can DoS the tick Mike Galbraith
2015-06-10 15:12 ` Thomas Gleixner
2015-06-10 16:29 ` Mike Galbraith
2015-06-10 18:27 ` Thomas Gleixner
2015-06-10 17:30 ` Mike Galbraith [this message]
2015-06-10 18:59 ` Thomas Gleixner
2015-06-10 19:15 ` Steven Rostedt
2015-06-10 19:32 ` Thomas Gleixner
2015-06-11 2:27 ` Mike Galbraith
2015-06-11 8:34 ` Thomas Gleixner
2015-06-11 11:41 ` Mike Galbraith
2015-06-11 13:13 ` Thomas Gleixner
2015-06-11 13:58 ` Mike Galbraith
2015-06-11 18:43 ` Mike Galbraith
2015-06-11 18:52 ` Thomas Gleixner
2015-06-11 18:55 ` Mike Galbraith
2015-06-11 7:35 ` Mike Galbraith
2015-06-11 7:43 ` Mike Galbraith
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