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Date: Sat, 5 Sep 2009 12:06:58 -0300 From: Arnaldo Carvalho de Melo <acme@...hat.com> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Clark Williams <williams@...hat.com>, linux-rt-users@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, Thomas Gleixner <tglx@...utronix.de>, Peter Zijlstra <peterz@...radead.org>, Frederic Weisbecker <fweisbec@...il.com>, Arnaldo Carvalho de Melo <acme@...hat.com> Subject: Re: [PATCH 00/18] tracing/ring-buffer: fixes for latency tracer [2.6.32] Em Fri, Sep 04, 2009 at 07:55:27PM -0400, Steven Rostedt escreveu: > Thomas, > > I can port these over to -rt if you want, or you could just > add them yourself. I know the spinlocks need to be converted to atomic. > Just let me know if you want me to do it. I did a quick port to tip/rt/head and couldn't reproduce the problems I was experiencing, thanks! I've put the ported patch series at: http://userweb.kernel.org/~acme/rostedt-rb-rt Tested using: echo 1 > /sys/kernel/debug/tracing/events/irq/enable echo 1 > /sys/kernel/debug/tracing/events/sched/enable echo wakeup > /sys/kernel/debug/tracing/current_tracer Then a make -j64 allyesconfig + cyclictest -p95 ... [root@...1xm-1 ~]# uname -a Linux hs21xm-1 2.6.31-rc8-rt9 #2 SMP PREEMPT RT Sat Sep 5 09:42:03 CDT 2009 x86_64 x86_64 x86_64 GNU/Linux [root@...1xm-1 ~]# cat /sys/kernel/debug/tracing/trace # tracer: wakeup # # wakeup latency trace v1.1.5 on 2.6.31-rc8-rt9 # -------------------------------------------------------------------- # latency: 220 us, #43/43, CPU#4 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:8) # ----------------- # | task: -2924 (uid:0 nice:-5 policy:1 rt_prio:85) # ----------------- # # _------=> CPU# # / _-----=> irqs-off # | / _----=> need-resched # || / _---=> hardirq/softirq # ||| / _--=> preempt-depth # |||| / # ||||| delay # cmd pid ||||| time | caller # \ / ||||| \ | / sirq-rcu-52 3d..3 0us : sched_switch: task sirq-rcu/3:52 [29] (D) ==> cc1:13267 [120] <idle>-0 5d.h3 0us : 0:140:R + [004] 2924: 14:R irq/60-eth2 <idle>-0 5d.h3 1us+: wake_up_process <-handle_IRQ_event irq/60-e-2924 4d..2 4us+: sched_wakeup: task sirq-net-rx/4:60 [24] success=1 <...>-13267 3d..3 8us : sched_switch: task cc1:13267 [120] (T|0x100) ==> cc1:13085 [120] irq/60-e-2924 4d.h2 8us+: sched_wakeup: task sirq-timer/4:58 [29] success=1 irq/60-e-2924 4d.h2 10us+: sched_wakeup: task sirq-rcu/4:65 [29] success=1 irq/60-e-2924 4d..3 15us+: sched_switch: task irq/60-eth2:2924 [14] (D) ==> sirq-net-rx/4:60 [24] <...>-12172 0d..4 26us+: sched_wakeup: task cc1:13566 [120] success=0 <...>-13566 7d..4 36us+: sched_wakeup: task cc1:12172 [120] success=0 <...>-60 4d..2 39us+: sched_wakeup: task cc1:12985 [120] success=1 <...>-13300 2d..4 44us+: sched_wakeup: task cc1:12172 [120] success=0 <...>-13566 7d..3 46us+: sched_switch: task cc1:13566 [120] (R) ==> cc1:12985 [120] <...>-60 4d..2 55us+: sched_wakeup: task cc1:13149 [120] success=1 <...>-60 4d..4 59us+: sched_wakeup: task cc1:12985 [120] success=0 <...>-12985 7d..2 65us : sched_migrate_task: task cc1:13274 [120] from: 4 to: 7 <idle>-0 5d.h3 67us+: sched_wakeup: task sirq-timer/5:71 [29] success=1 <...>-12985 7d..2 68us+: sched_wakeup: task cc1:13274 [120] success=1 <idle>-0 5d..3 70us+: sched_switch: task swapper:0 [140] (R) ==> sirq-timer/5:71 [29] sirq-tim-71 5d..3 74us+: sched_switch: task sirq-timer/5:71 [29] (D) ==> swapper:0 [140] <...>-60 4d..2 82us+: sched_wakeup: task cc1:12683 [120] success=1 <...>-60 4d..3 89us+: sched_switch: task sirq-net-rx/4:60 [24] (D) ==> sirq-timer/4:58 [29] sirq-tim-58 4d..3 93us+: sched_switch: task sirq-timer/4:58 [29] (D) ==> sirq-rcu/4:65 [29] sirq-rcu-65 4d..3 97us+: sched_switch: task sirq-rcu/4:65 [29] (D) ==> cc1:13355 [120] <...>-13210 6d..3 103us+: sched_switch: task cc1:13210 [120] (T|0x100) ==> fixdep:13407 [120] <...>-13407 6d..2 127us+: sched_wakeup: task cc1:13127 [120] success=1 <...>-13407 6d.h3 134us+: sched_wakeup: task sirq-timer/6:84 [29] success=1 <...>-13407 6dNh3 137us+: sched_wakeup: task sirq-rcu/6:91 [29] success=1 <...>-13407 6d..3 141us+: sched_switch: task fixdep:13407 [120] (R) ==> sirq-timer/6:84 [29] <...>-13300 2d..4 145us : sched_wakeup: task cc1:12172 [120] success=0 sirq-tim-84 6d..3 146us+: sched_switch: task sirq-timer/6:84 [29] (D) ==> sirq-rcu/6:91 [29] sirq-rcu-91 6d..3 153us+: sched_switch: task sirq-rcu/6:91 [29] (D) ==> genksyms:13194 [120] <...>-12985 7d.h2 194us+: sched_wakeup: task sirq-timer/7:97 [29] success=1 <...>-13358 1d..3 199us : sched_switch: task genksyms:13358 [120] (D) ==> as:12659 [120] <...>-12985 7dNh2 199us+: sched_wakeup: task sirq-rcu/7:104 [29] success=1 <...>-12985 7d..3 204us+: sched_switch: task cc1:12985 [120] (R) ==> sirq-timer/7:97 [29] sirq-tim-97 7d.h1 207us : irq_handler_entry: irq=60 handler=eth2 sirq-tim-97 7d.h1 208us+: irq_handler_exit: irq=60 return=handled sirq-tim-97 7d.h2 211us+: sched_wakeup: task irq/60-eth2:2924 [14] success=1 sirq-tim-97 7d..3 216us+: sched_switch: task sirq-timer/7:97 [29] (D) ==> sirq-rcu/7:104 [29] <...>-13355 4d..3 219us : sched_switch: task cc1:13355 [120] (R) ==> irq/60-eth2:2924 [14] <...>-13355 4d..3 219us : __schedule <-schedule <...>-13355 4d..3 220us : 13355:120:R ==> [004] 2924: 14:R irq/60-eth2 - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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