From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01
Date: Sat, 19 Feb 2005 00:08:24 -0500 [thread overview]
Message-ID: <1108789704.8411.9.camel@krustophenia.net> (raw)
In-Reply-To: <20050204100347.GA13186@elte.hu>
On Fri, 2005-02-04 at 11:03 +0100, Ingo Molnar wrote:
> http://redhat.com/~mingo/realtime-preempt/
>
Testing on an all SCSI 1.3Ghz Athlon XP system, I am seeing very long
latencies in the journalling code with 2.6.11-rc4-RT-V0.7.39-02.
preemption latency trace v1.1.4 on 2.6.11-rc4-RT-V0.7.39-02
--------------------------------------------------------------------
latency: 713 µs, #3455/3455, CPU#0 | (M:preempt VP:0, KP:1, SP:1 HP:1 #P:1)
-----------------
| task: ksoftirqd/0-2 (uid:0 nice:-10 policy:0 rt_prio:0)
-----------------
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
kjournal-2478 0dn.4 0µs!: <756f6a6b> (<6c616e72>)
kjournal-2478 0dn.4 0µs : __trace_start_sched_wakeup (try_to_wake_up)
kjournal-2478 0dn.3 0µs : preempt_schedule (try_to_wake_up)
kjournal-2478 0dn.3 0µs : try_to_wake_up <<...>-2> (69 73):
kjournal-2478 0dn.2 0µs : preempt_schedule (try_to_wake_up)
kjournal-2478 0dn.2 0µs : wake_up_process (do_softirq)
kjournal-2478 0dn.1 1µs < (1)
The repeating pattern is 8 of these:
kjournal-2478 0.n.1 1µs : inverted_lock (journal_commit_transaction)
kjournal-2478 0.n.1 1µs : __journal_unfile_buffer (journal_commit_transaction)
kjournal-2478 0.n.1 1µs : journal_remove_journal_head (journal_commit_transaction)
kjournal-2478 0.n.1 1µs : __journal_remove_journal_head (journal_remove_journal_head)
kjournal-2478 0.n.1 1µs : __brelse (__journal_remove_journal_head)
kjournal-2478 0.n.1 1µs : journal_free_journal_head (journal_remove_journal_head)
kjournal-2478 0.n.1 2µs : kmem_cache_free (journal_free_journal_head)
and one of these:
kjournal-2478 0dn.1 9µs : cache_flusharray (kmem_cache_free)
kjournal-2478 0dn.2 9µs : free_block (cache_flusharray)
kjournal-2478 0dn.1 11µs : preempt_schedule (cache_flusharray)
kjournal-2478 0dn.1 11µs : memmove (cache_flusharray)
kjournal-2478 0dn.1 11µs : memcpy (memmove)
etc. Finally:
kjournal-2478 0dn.1 704µs : cache_flusharray (kmem_cache_free)
kjournal-2478 0dn.2 704µs+: free_block (cache_flusharray)
kjournal-2478 0dn.1 707µs : preempt_schedule (cache_flusharray)
kjournal-2478 0dn.1 707µs : memmove (cache_flusharray)
kjournal-2478 0dn.1 707µs : memcpy (memmove)
kjournal-2478 0.n.1 708µs : inverted_lock (journal_commit_transaction)
kjournal-2478 0.n.1 708µs : __journal_unfile_buffer (journal_commit_transaction)
kjournal-2478 0.n.1 709µs : journal_remove_journal_head (journal_commit_transaction)
kjournal-2478 0.n.1 709µs : __journal_remove_journal_head (journal_remove_journal_head)
kjournal-2478 0.n.1 709µs : __brelse (__journal_remove_journal_head)
kjournal-2478 0.n.1 709µs : journal_free_journal_head (journal_remove_journal_head)
kjournal-2478 0.n.1 709µs : kmem_cache_free (journal_free_journal_head)
kjournal-2478 0.n.. 710µs : preempt_schedule (journal_commit_transaction)
kjournal-2478 0dn.. 710µs : __schedule (preempt_schedule)
kjournal-2478 0dn.. 710µs : profile_hit (__schedule)
kjournal-2478 0dn.1 710µs : sched_clock (__schedule)
kjournal-2478 0dn.2 711µs : dequeue_task (__schedule)
kjournal-2478 0dn.2 711µs : recalc_task_prio (__schedule)
kjournal-2478 0dn.2 711µs : effective_prio (recalc_task_prio)
kjournal-2478 0dn.2 711µs : enqueue_task (__schedule)
<...>-2 0d..2 712µs : __switch_to (__schedule)
<...>-2 0d..2 712µs : __schedule <kjournal-2478> (73 69):
<...>-2 0d..2 712µs : finish_task_switch (__schedule)
<...>-2 0d..1 712µs : trace_stop_sched_switched (finish_task_switch)
<...>-2 0d..1 712µs : trace_stop_sched_switched <<...>-2> (69 0):
<...>-2 0d..1 713µs : trace_stop_sched_switched (finish_task_switch)
Lee
next prev parent reply other threads:[~2005-02-19 5:08 UTC|newest]
Thread overview: 125+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-04 10:03 [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01 Ingo Molnar
2005-02-04 15:19 ` Kevin Hilman
2005-02-04 17:30 ` Ingo Molnar
2005-02-04 18:19 ` Tom Rini
2005-02-07 9:03 ` Ingo Molnar
2005-02-07 14:35 ` Tom Rini
2005-02-08 8:27 ` Ingo Molnar
2005-02-06 4:19 ` Valdis.Kletnieks
2005-02-07 9:21 ` Ingo Molnar
2005-02-07 15:08 ` Real-Time Preemption and UML? Esben Nielsen
2005-02-07 18:35 ` Jeff Dike
2005-02-07 23:14 ` Esben Nielsen
2005-02-08 8:39 ` Ingo Molnar
2005-02-08 18:55 ` Jeff Dike
2005-02-08 21:20 ` Esben Nielsen
2005-02-08 21:44 ` Ingo Molnar
2005-02-08 23:02 ` Esben Nielsen
2005-02-08 7:55 ` [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01 Valdis.Kletnieks
2005-02-08 8:45 ` Ingo Molnar
2005-02-08 10:26 ` Valdis.Kletnieks
2005-02-08 21:58 ` William Weston
2005-02-09 11:51 ` Ingo Molnar
2005-02-10 2:13 ` William Weston
2005-02-10 7:52 ` Ingo Molnar
2005-02-10 20:21 ` George Anzinger
2005-02-10 20:40 ` Ingo Molnar
2005-02-10 21:05 ` George Anzinger
2005-02-11 8:34 ` Ingo Molnar
2005-02-11 9:38 ` Sven Dietrich
2005-02-11 9:42 ` Ingo Molnar
2005-02-11 0:09 ` Sven Dietrich
2005-02-11 6:01 ` George Anzinger
2005-02-11 8:28 ` Ingo Molnar
2005-02-11 9:53 ` Sven Dietrich
2005-02-11 10:04 ` Ingo Molnar
2005-02-11 21:49 ` Steven Rostedt
2005-02-13 12:59 ` Ingo Molnar
2005-02-13 15:11 ` Steven Rostedt
2005-03-03 19:36 ` [patch] Real-Time Preemption, deactivate() scheduling issue Eugeny S. Mints
2005-03-03 22:32 ` Esben Nielsen
2005-03-04 11:56 ` Eugeny S. Mints
2005-03-04 15:45 ` George Anzinger
2005-03-29 8:45 ` Ingo Molnar
2005-02-09 12:48 ` [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01 Stephen Smalley
2005-02-10 2:20 ` William Weston
2005-02-19 5:08 ` Lee Revell [this message]
2005-02-19 6:47 ` Lee Revell
2005-02-19 9:00 ` Ingo Molnar
2005-02-19 9:03 ` Ingo Molnar
2005-02-19 20:45 ` Lee Revell
2005-02-20 0:19 ` Lee Revell
2005-03-17 16:33 ` Lee Revell
2005-02-23 2:22 ` Lee Revell
2005-03-10 9:37 ` Steven Rostedt
2005-03-10 9:54 ` Steven Rostedt
2005-03-11 9:57 ` Ingo Molnar
2005-03-11 10:15 ` Steven Rostedt
2005-03-11 10:17 ` Ingo Molnar
2005-03-11 10:24 ` Steven Rostedt
2005-03-11 10:43 ` Andrew Morton
2005-03-11 10:53 ` Steven Rostedt
2005-03-11 14:40 ` Steven Rostedt
2005-03-11 15:08 ` Steven Rostedt
2005-03-11 15:30 ` K.R. Foley
2005-03-11 15:38 ` Ingo Molnar
2005-03-11 16:01 ` Steven Rostedt
2005-03-11 20:39 ` Steven Rostedt
2005-03-11 20:46 ` Lee Revell
2005-03-11 22:06 ` Lee Revell
2005-03-14 7:37 ` Steven Rostedt
2005-03-14 9:33 ` Steven Rostedt
2005-03-14 10:10 ` Steven Rostedt
2005-03-14 15:50 ` Steven Rostedt
2005-03-14 19:02 ` Steven Rostedt
2005-03-15 11:44 ` Steven Rostedt
2005-03-15 12:00 ` Ingo Molnar
2005-03-15 13:07 ` Steven Rostedt
2005-03-15 13:35 ` Ingo Molnar
2005-03-15 13:55 ` Steven Rostedt
2005-03-15 19:12 ` Andrew Morton
2005-03-15 18:05 ` Steven Rostedt
2005-03-15 19:09 ` Lee Revell
2005-03-16 7:50 ` Steven Rostedt
2005-03-16 18:21 ` Lee Revell
2005-03-16 7:31 ` Steven Rostedt
2005-03-16 8:50 ` Ingo Molnar
2005-03-16 9:15 ` Andrew Morton
2005-03-16 9:51 ` [patch 0/3] j_state_lock, j_list_lock, remove-bitlocks Ingo Molnar
2005-03-16 9:53 ` [patch 1/3] j_state_lock -> j_state_sem Ingo Molnar
2005-03-16 9:53 ` [patch 2/3] j_list_lock -> j_list_sem Ingo Molnar
2005-03-16 9:57 ` [patch 3/3] remove bitlocks Ingo Molnar
2005-03-16 10:04 ` [patch 0/3] j_state_lock, j_list_lock, remove-bitlocks Andrew Morton
2005-03-16 10:12 ` Ingo Molnar
2005-03-16 10:23 ` Steven Rostedt
2005-03-16 10:26 ` Ingo Molnar
2005-03-16 10:26 ` Andrew Morton
2005-03-16 10:29 ` Ingo Molnar
2005-03-16 10:41 ` Andrew Morton
2005-03-16 10:34 ` Arjan van de Ven
2005-03-16 10:19 ` Ingo Molnar
2005-03-16 10:40 ` Andrew Morton
2005-03-16 10:51 ` Ingo Molnar
2005-03-16 11:05 ` Steven Rostedt
2005-03-16 11:19 ` Andrew Morton
2005-03-16 14:04 ` Steven Rostedt
2005-03-16 16:47 ` Steven Rostedt
2005-03-16 17:47 ` Steven Rostedt
2005-03-16 19:20 ` Lee Revell
2005-03-17 7:15 ` Steven Rostedt
2005-03-17 15:41 ` Lee Revell
2005-03-17 16:23 ` Steven Rostedt
2005-03-17 16:36 ` Lee Revell
2005-03-18 6:58 ` Steven Rostedt
2005-03-18 18:19 ` Lee Revell
2005-03-16 21:15 ` Andrew Morton
2005-03-17 9:21 ` Steven Rostedt
2005-03-18 9:23 ` [PATCH] remove lame schedule in journal inverted_lock (was: Re: [patch 0/3] j_state_lock, j_list_lock, remove-bitlocks) Steven Rostedt
2005-03-18 9:32 ` Andrew Morton
2005-03-18 10:38 ` Steven Rostedt
2005-03-18 11:07 ` Andrew Morton
2005-03-18 12:10 ` Steven Rostedt
2005-03-17 9:58 ` [patch 0/3] j_state_lock, j_list_lock, remove-bitlocks Steven Rostedt
2005-03-11 9:28 ` [patch] Real-Time Preemption, -RT-2.6.11-final-V0.7.40-00 Ingo Molnar
2005-03-11 12:10 ` Andrew Walrond
2005-03-14 20:19 ` Tom Rini
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