linux-kernel - Re: Reading EeePC900 battery info causes stalls

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Message-ID: <48D52FE3.6060803@yahoo.com>
Date:	Sat, 20 Sep 2008 18:16:19 +0100
From:	Sitsofe Wheeler <sitsofe@...oo.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, lenb@...nel.org,
	astarikovskiy@...e.de
Subject: Re: Reading EeePC900 battery info causes stalls

Steven Rostedt wrote:
> OK, that is probably the known bug you are hitting. Simply disable the 
> CONFIG_FTRACE_STARTUP_TEST and you should have the wakeup tracer. The bug 
> is with the test, not the tracer, so it should not hurt you.

Thanks - this made the wakeup tracer appear a you said. I have put two 
wakeup traces up:

http://sucs.org/~sits/test/eeepc-debug/20080920/latency_trace.txt.gz
http://sucs.org/~sits/test/eeepc-debug/20080920/trace.txt.gz
(each file is around 6Mbytes uncompressed)

Here's a small extract of latency_trace.txt:

> # tracer: wakeup
> #
> wakeup latency trace v1.1.5 on 2.6.27-rc6skw-dirty
> --------------------------------------------------------------------
>  latency: 3232905 us, #65620/6180619, CPU#0 | (M:desktop VP:0, KP:0, SP:0 HP:0)
>     -----------------
>     | task: speaker-test-5074 (uid:1000 nice:0 policy:1 rt_prio:25)
>     -----------------
> 
> #                _------=> CPU#            
> #               / _-----=> irqs-off        
> #              | / _----=> need-resched    
> #              || / _---=> hardirq/softirq 
> #              ||| / _--=> preempt-depth   
> #              |||| /                      
> #              |||||     delay             
> #  cmd     pid ||||| time  |   caller      
> #     \   /    |||||   \   |   /           
>      cat-6743  0.N.. 3198412us : acpi_ut_update_ref_count (acpi_ut_update_object_reference)
>      cat-6743  0.N.. 3198413us : acpi_ut_pop_generic_state (acpi_ut_update_object_reference)
>      cat-6743  0.N.. 3198413us : acpi_ut_delete_generic_state (acpi_ut_update_object_reference)
>      cat-6743  0.N.. 3198414us : acpi_os_release_object (acpi_ut_delete_generic_state)
>      cat-6743  0.N.. 3198414us : kmem_cache_free (acpi_os_release_object)
[...]
>      cat-6743  0.N.. 3232893us : acpi_ut_create_update_state (acpi_ut_create_update_state_and_push)
>      cat-6743  0.N.. 3232893us : acpi_ut_create_generic_state (acpi_ut_create_update_state)
>      cat-6743  0.N.. 3232894us : kmem_cache_alloc (acpi_ut_create_generic_state)
>      cat-6743  0dN.. 3232895us : __slab_alloc (kmem_cache_alloc)
>      cat-6743  0dN.. 3232895us : deactivate_slab (__slab_alloc)
>      cat-6743  0.N.. 3232896us+: __alloc_pages_internal (__slab_alloc)
>      cat-6743  0d... 3232904us+: marker_probe_cb (schedule)
>      cat-6743  0d... 3232905us!: schedule (__cond_resched)
>      cat-6743  0.N.. 3198412us : acpi_ut_push_generic_state (acpi_ut_create_update_state_and_push)

Is it intentional that the last event has a time earlier closer to that 
of the first event?

-- 
Sitsofe | http://sucs.org/~sits/
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