From: Michal Schmidt <xschmi00@stud.feec.vutbr.cz>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org,
"Eugeny S. Mints" <emints@ru.mvista.com>,
Daniel Walker <dwalker@mvista.com>
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00
Date: Wed, 08 Jun 2005 16:32:26 +0200 [thread overview]
Message-ID: <42A7017A.6080102@stud.feec.vutbr.cz> (raw)
In-Reply-To: <20050608112801.GA31084@elte.hu>
Ingo Molnar wrote:
> i have released the -V0.7.48-00 Real-Time Preemption patch, which can be
> downloaded from the usual place:
With -V0.7.48-01 I get interestingly long latency traces. For example
this one is 277 us. This is on i386. I've put the full trace to:
http://www.uamt.feec.vutbr.cz/rizeni/pom/latency_trace-RT-V0.7.48-01.txt
Because of the presence of __wake_up_sync there, I'd guess it has
something to do with the NEED_RESCHED_DELAYED thing.
Here's an excerpt of it:
preemption latency trace v1.1.4 on 2.6.12-rc6-RT-V0.7.48-01
--------------------------------------------------------------------
latency: 277 us, #2349/2349, CPU#0 | (M:rt VP:0, KP:1, SP:1 HP:1 #P:1)
-----------------
| task: XFree86-5780 (uid:0 nice:-10 policy:0 rt_prio:0)
-----------------
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
mozilla--6007 0Dnh2 0us!: <697a6f6d> (<2d616c6c>)
mozilla--6007 0Dnh2 0us : __trace_start_sched_wakeup (try_to_wake_up)
mozilla--6007 0.... 0us : _spin_unlock_irqrestore (__wake_up_sync)
mozilla--6007 0.... 0us : up_mutex (__wake_up_sync)
mozilla--6007 0.... 0us : __up_mutex (up_mutex)
mozilla--6007 0.... 0us : _read_unlock (sock_wfree)
mozilla--6007 0.... 0us : up_read_mutex (sock_wfree)
mozilla--6007 0.... 1us : up_write_mutex (sock_wfree)
mozilla--6007 0.... 1us : __up_mutex (up_write_mutex)
mozilla--6007 0.... 1us : kfree_skbmem (unix_stream_recvmsg)
mozilla--6007 0.... 1us : skb_release_data (kfree_skbmem)
mozilla--6007 0.... 1us : kfree (kfree_skbmem)
mozilla--6007 0.... 1us : __local_save_flags (kfree)
mozilla--6007 0.... 1us : _spin_lock (kfree)
mozilla--6007 0.... 2us : __spin_lock (_spin_lock)
mozilla--6007 0.... 2us : __might_sleep (__spin_lock)
mozilla--6007 0.... 2us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 2us : _down_mutex (__spin_lock)
mozilla--6007 0.... 2us : __down_mutex (__spin_lock)
mozilla--6007 0...1 2us : grab_lock (__down_mutex)
mozilla--6007 0...1 2us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 2us : _spin_unlock (kfree)
mozilla--6007 0.... 2us : up_mutex (kfree)
mozilla--6007 0.... 3us : __up_mutex (up_mutex)
mozilla--6007 0.... 3us : kmem_cache_free (kfree_skbmem)
mozilla--6007 0.... 3us : __local_save_flags (kmem_cache_free)
mozilla--6007 0.... 3us : _spin_lock (kmem_cache_free)
mozilla--6007 0.... 3us : __spin_lock (_spin_lock)
mozilla--6007 0.... 3us : __might_sleep (__spin_lock)
mozilla--6007 0.... 3us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 3us : _down_mutex (__spin_lock)
mozilla--6007 0.... 3us : __down_mutex (__spin_lock)
mozilla--6007 0...1 4us : grab_lock (__down_mutex)
mozilla--6007 0...1 4us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 4us : _spin_unlock (kmem_cache_free)
mozilla--6007 0.... 4us : up_mutex (kmem_cache_free)
mozilla--6007 0.... 4us : __up_mutex (up_mutex)
mozilla--6007 0.... 4us : skb_dequeue (unix_stream_recvmsg)
mozilla--6007 0.... 4us : _spin_lock_irqsave (skb_dequeue)
mozilla--6007 0.... 4us : __spin_lock (_spin_lock_irqsave)
mozilla--6007 0.... 5us : __might_sleep (__spin_lock)
mozilla--6007 0.... 5us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 5us : _down_mutex (__spin_lock)
mozilla--6007 0.... 5us : __down_mutex (__spin_lock)
mozilla--6007 0...1 5us : grab_lock (__down_mutex)
mozilla--6007 0...1 5us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 5us : __local_save_flags (_spin_lock_irqsave)
mozilla--6007 0.... 5us : _spin_unlock_irqrestore (skb_dequeue)
.
.
.
mozilla--6007 0.... 268us : __wake_up_common (__wake_up_sync)
mozilla--6007 0.... 268us : default_wake_function (__wake_up_common)
mozilla--6007 0.... 268us : try_to_wake_up (__wake_up_common)
mozilla--6007 0.... 268us : _spin_unlock_irqrestore (__wake_up_sync)
mozilla--6007 0.... 268us : up_mutex (__wake_up_sync)
mozilla--6007 0.... 269us : __up_mutex (up_mutex)
mozilla--6007 0.... 269us : _read_unlock (sock_wfree)
mozilla--6007 0.... 269us : up_read_mutex (sock_wfree)
mozilla--6007 0.... 269us : up_write_mutex (sock_wfree)
mozilla--6007 0.... 269us : __up_mutex (up_write_mutex)
mozilla--6007 0.... 269us : kfree_skbmem (unix_stream_recvmsg)
mozilla--6007 0.... 269us : skb_release_data (kfree_skbmem)
mozilla--6007 0.... 269us : kfree (kfree_skbmem)
mozilla--6007 0.... 270us : __local_save_flags (kfree)
mozilla--6007 0.... 270us : _spin_lock (kfree)
mozilla--6007 0.... 270us : __spin_lock (_spin_lock)
mozilla--6007 0.... 270us : __might_sleep (__spin_lock)
mozilla--6007 0.... 270us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 270us : _down_mutex (__spin_lock)
mozilla--6007 0.... 270us : __down_mutex (__spin_lock)
mozilla--6007 0...1 270us : grab_lock (__down_mutex)
mozilla--6007 0...1 270us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 270us : _spin_unlock (kfree)
mozilla--6007 0.... 271us : up_mutex (kfree)
mozilla--6007 0.... 271us : __up_mutex (up_mutex)
mozilla--6007 0.... 271us : kmem_cache_free (kfree_skbmem)
mozilla--6007 0.... 271us : __local_save_flags (kmem_cache_free)
mozilla--6007 0.... 271us : _spin_lock (kmem_cache_free)
mozilla--6007 0.... 271us : __spin_lock (_spin_lock)
mozilla--6007 0.... 271us : __might_sleep (__spin_lock)
mozilla--6007 0.... 271us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 271us : _down_mutex (__spin_lock)
mozilla--6007 0.... 271us : __down_mutex (__spin_lock)
mozilla--6007 0...1 272us : grab_lock (__down_mutex)
mozilla--6007 0...1 272us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 272us : _spin_unlock (kmem_cache_free)
mozilla--6007 0.... 272us : up_mutex (kmem_cache_free)
mozilla--6007 0.... 272us : __up_mutex (up_mutex)
mozilla--6007 0.... 272us : rt_up (unix_stream_recvmsg)
mozilla--6007 0...1 272us : __up_mutex (rt_up)
mozilla--6007 0.... 273us : dnotify_parent (vfs_read)
mozilla--6007 0.... 273us : _spin_lock (dnotify_parent)
mozilla--6007 0.... 273us : __spin_lock (_spin_lock)
mozilla--6007 0.... 273us : __might_sleep (__spin_lock)
mozilla--6007 0.... 273us : irqs_disabled (__might_sleep)
mozilla--6007 0.... 273us : _down_mutex (__spin_lock)
mozilla--6007 0.... 273us : __down_mutex (__spin_lock)
mozilla--6007 0...1 273us : grab_lock (__down_mutex)
mozilla--6007 0...1 274us : __down_mutex <mozilla--6007> (7d 0)
mozilla--6007 0.... 274us : _spin_unlock (vfs_read)
mozilla--6007 0.... 274us : up_mutex (vfs_read)
mozilla--6007 0.... 274us : __up_mutex (up_mutex)
mozilla--6007 0.... 274us : fput (sys_read)
mozilla--6007 0Dnh. 274us : __schedule (work_resched)
mozilla--6007 0Dnh. 275us : profile_hit (__schedule)
mozilla--6007 0Dnh1 275us : sched_clock (__schedule)
mozilla--6007 0Dnh1 275us : local_irq_disable (__schedule)
<...>-5780 0dnh2 276us : __switch_to (__schedule)
<...>-5780 0dnh2 276us : __schedule <mozilla--6007> (7d 73)
<...>-5780 0dnh1 276us : trace_stop_sched_switched (__schedule)
<...>-5780 0dnh1 276us : trace_stop_sched_switched <<...>-5780> (73 0)
<...>-5780 0dnh1 277us : trace_stop_sched_switched (__schedule)
next prev parent reply other threads:[~2005-06-08 14:33 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-08 11:28 [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Ingo Molnar
2005-06-08 14:18 ` Michal Schmidt
2005-06-08 14:40 ` Keith Owens
2005-06-08 14:41 ` Paulo Marques
2005-06-08 15:04 ` Michal Schmidt
2005-06-08 15:23 ` Keith Owens
2005-06-08 15:56 ` Paulo Marques
2005-06-08 14:32 ` Michal Schmidt [this message]
2005-06-08 15:48 ` K.R. Foley
2005-06-08 16:08 ` K.R. Foley
2005-06-08 16:26 ` K.R. Foley
2005-06-08 17:26 ` K.R. Foley
2005-06-08 19:18 ` Ingo Molnar
2005-06-09 11:39 ` Ingo Molnar
2005-06-10 13:34 ` K.R. Foley
2005-06-09 8:47 ` Serge Noiraud
2005-06-09 11:55 ` Ingo Molnar
2005-06-09 15:12 ` Serge Noiraud
2005-06-09 16:34 ` Daniel Walker
2005-06-13 8:53 ` Serge Noiraud
2005-06-13 9:07 ` Ingo Molnar
2005-06-08 17:51 ` Michal Schmidt
2005-06-09 11:45 ` Ingo Molnar
2005-06-09 12:09 ` Michal Schmidt
2005-06-09 12:13 ` Ingo Molnar
2005-06-09 12:48 ` Michal Schmidt
2005-06-10 8:56 ` Esben Nielsen
2005-06-08 19:58 ` Daniel Walker
2005-06-09 21:24 ` Michal Schmidt
2005-06-09 21:34 ` Michal Schmidt
2005-06-11 7:32 ` Ingo Molnar
2005-06-11 8:10 ` Ingo Molnar
2005-06-11 16:35 ` Peter Zijlstra
2005-06-11 18:48 ` Ingo Molnar
2005-06-11 21:14 ` Peter Zijlstra
2005-06-12 1:40 ` Gene Heskett
2005-06-12 6:49 ` Ingo Molnar
2005-06-12 9:02 ` Gene Heskett
2005-06-12 10:35 ` Ingo Molnar
2005-06-12 13:40 ` Gene Heskett
2005-06-12 13:49 ` Ingo Molnar
2005-06-12 14:23 ` Gene Heskett
2005-06-13 2:11 ` Gene Heskett
2005-06-13 6:09 ` Ingo Molnar
2005-06-13 8:37 ` Gene Heskett
2005-06-14 18:24 ` K.R. Foley
2005-06-14 18:54 ` Ingo Molnar
2005-06-14 22:45 ` Daniel Walker
2005-06-15 6:12 ` Ingo Molnar
2005-06-15 9:13 ` Esben Nielsen
2005-06-14 20:37 ` Paul E. McKenney
2005-06-16 3:51 ` K.R. Foley
2005-06-16 7:29 ` Ingo Molnar
2005-06-16 11:22 ` K.R. Foley
2005-06-16 17:32 ` Ingo Molnar
2005-06-16 17:59 ` K.R. Foley
2005-06-16 20:37 ` K.R. Foley
2005-06-17 11:08 ` Ingo Molnar
2005-06-16 20:43 ` Ingo Molnar
2005-06-17 2:06 ` Gene Heskett
2005-06-17 4:53 ` Gene Heskett
2005-06-17 11:18 ` Ingo Molnar
2005-06-17 14:12 ` K.R. Foley
2005-06-17 15:33 ` K.R. Foley
2005-06-17 19:28 ` William Weston
2005-06-17 21:30 ` William Weston
2005-06-18 12:28 ` Ingo Molnar
2005-06-21 1:18 ` William Weston
2005-06-23 2:05 ` William Weston
2005-06-23 7:56 ` Ingo Molnar
2005-06-23 13:45 ` Gene Heskett
2005-06-21 13:10 ` Ingo Molnar
2005-06-21 19:08 ` William Weston
2005-06-21 20:17 ` Benjamin LaHaise
2005-06-21 20:37 ` William Weston
2005-06-21 20:48 ` Benjamin LaHaise
2005-06-22 2:42 ` Gene Heskett
2005-06-22 7:40 ` Ingo Molnar
2005-06-22 13:27 ` Gene Heskett
2005-06-22 13:51 ` Gene Heskett
2005-06-22 14:08 ` Gene Heskett
2005-06-25 4:41 ` Ingo Molnar
2005-06-25 4:47 ` Ingo Molnar
2005-06-25 5:39 ` Gene Heskett
2005-06-25 7:26 ` Gene Heskett
2005-06-25 9:12 ` Ingo Molnar
2005-06-25 13:19 ` Gene Heskett
2005-06-25 14:39 ` Gene Heskett
2005-06-27 19:01 ` Real-Time Preemption, -RT-2.6.12-final-V0.7.50-24 Chuck Harding
2005-06-27 19:42 ` Chuck Harding
2005-06-27 21:08 ` Gene Heskett
2005-06-27 20:09 ` Daniel Walker
2005-06-27 20:28 ` Chuck Harding
2005-06-28 0:50 ` Daniel Walker
2005-06-28 7:53 ` Steven Rostedt
2005-06-28 8:18 ` Ingo Molnar
2005-06-28 8:34 ` Steven Rostedt
2005-06-28 9:12 ` Ingo Molnar
2005-06-28 15:26 ` Michal Schmidt
2005-06-28 15:31 ` Ingo Molnar
2005-06-28 18:50 ` Chuck Harding
2005-06-28 22:16 ` Chuck Harding
2005-06-29 0:32 ` Chuck Harding
2005-06-28 15:54 ` Daniel Walker
2005-06-21 13:12 ` [patch] Real-Time Preemption, -RT-2.6.12-rc6-V0.7.48-00 Ingo Molnar
[not found] ` <Pine.LNX.4.58.0506211228210.16701@echo.lysdexia.org>
2005-06-22 8:03 ` Ingo Molnar
2005-06-22 8:24 ` Ingo Molnar
2005-06-22 10:08 ` Ingo Molnar
2005-06-22 21:53 ` William Weston
2005-06-22 22:00 ` Ingo Molnar
2005-06-22 23:06 ` William Weston
2005-06-23 0:10 ` Ingo Molnar
2005-06-23 22:11 ` William Weston
2005-06-24 1:46 ` William Weston
2005-06-24 7:06 ` Ingo Molnar
2005-06-24 22:31 ` William Weston
2005-06-25 4:14 ` Ingo Molnar
2005-06-27 4:21 ` William Weston
2005-06-27 8:15 ` Ingo Molnar
2005-06-28 3:32 ` William Weston
2005-06-28 8:10 ` Ingo Molnar
2005-06-28 11:15 ` Ingo Molnar
[not found] ` <Pine.LNX.4.58.0506281745040.10406@echo.lysdexia.org>
2005-06-29 12:54 ` Ingo Molnar
2005-06-30 0:29 ` William Weston
2005-06-27 5:43 ` Gene Heskett
2005-06-27 8:17 ` Ingo Molnar
2005-06-27 17:29 ` Gene Heskett
2005-06-27 19:54 ` Ingo Molnar
2005-06-27 21:17 ` Gene Heskett
2005-06-28 8:28 ` Ingo Molnar
2005-06-08 14:02 kus Kusche Klaus
2005-06-08 14:14 ` Thomas Gleixner
2005-06-08 15:49 ` Daniel Walker
2005-06-08 15:50 ` Ingo Molnar
2005-06-08 16:23 ` Thomas Gleixner
2005-06-08 17:29 ` Daniel Walker
2005-06-08 19:24 ` Ingo Molnar
2005-06-12 9:29 Zoltan Boszormenyi
2005-06-12 10:39 ` Ingo Molnar
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