linux-kernel - Re: [PATCH 0/8] [GIT PULL] TRACE

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Date:	Tue, 14 Apr 2009 15:33:19 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Theodore Tso <tytso@....edu>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@....de>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Zhaolei <zhaolei@...fujitsu.com>, Li Zefan <lizf@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	"Frank Ch. Eigler" <fche@...stic.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [PATCH 0/8] [GIT PULL] TRACE_EVENT for modules

Steven Rostedt wrote:
> On Tue, 14 Apr 2009, Jeremy Fitzhardinge wrote:
>
>   
>> Theodore Tso wrote:
>>     
>>> Any chance you could support something like this?
>>>
>>>   
>>>       
>> I think that's already there.  I'm defining
>> arch/x86/include/asm/paravirt-trace.h with:
>>
>> #ifndef _ASM_X86_PARAVIRT_TRACE_H
>> #define _ASM_X86_PARAVIRT_TRACE_H
>>
>> #include <linux/tracepoint.h>
>> #include <asm/paravirt_types.h>
>>
>> #undef TRACE_SYSTEM
>> #define TRACE_SYSTEM pvops
>>
>> #define TRACE_INCLUDE_FILE	paravirt-trace
>> #define TRACE_INCLUDE_PATH	asm
>> [...]
>>
>>
>> Which ends up including <asm/paravirt-trace.h>
>>     
>
> Not quite. It ends up looking like
>
> #include "asm/paravirt-trace.h"
>
> As long as there is no "asm" directory in the include/trace directory, I 
> think that is fine.

OK.

I'm having a bit of trouble with paravirt-trace.h when I actually 
include it in paravirt.h.  asm/paravirt.h is itself included in lots of 
places, and so its fairly easy to end up with cyclic include 
dependencies which are fairly painful.  In this case I'm seeing 
asm/paravirt.h -> linux/tracepoint.h -> linux/rcupate.h -> {lots of 
stuff}, which gives errors like:

  CC      arch/x86/kernel/asm-offsets.s
In file included from /home/jeremy/git/linux/include/linux/thread_info.h:55,
                 from /home/jeremy/git/linux/include/linux/preempt.h:9,
                 from /home/jeremy/git/linux/include/linux/spinlock.h:50,
                 from /home/jeremy/git/linux/include/linux/rcupdate.h:37,
                 from /home/jeremy/git/linux/include/linux/tracepoint.h:18,
                 from /home/jeremy/git/linux/arch/x86/include/asm/paravirt-trace.h:4,
                 from /home/jeremy/git/linux/arch/x86/include/asm/paravirt.h:18,
                 from /home/jeremy/git/linux/arch/x86/include/asm/irqflags.h:55,
                 from /home/jeremy/git/linux/include/linux/irqflags.h:57,
                 from /home/jeremy/git/linux/arch/x86/include/asm/system.h:11,
                 from /home/jeremy/git/linux/arch/x86/include/asm/processor.h:17,
                 from /home/jeremy/git/linux/include/linux/prefetch.h:14,
                 from /home/jeremy/git/linux/include/linux/list.h:6,
                 from /home/jeremy/git/linux/include/linux/module.h:9,
                 from /home/jeremy/git/linux/include/linux/crypto.h:21,
                 from /home/jeremy/git/linux/arch/x86/kernel/asm-offsets_64.c:7,
                 from /home/jeremy/git/linux/arch/x86/kernel/asm-offsets.c:4:
/home/jeremy/git/linux/arch/x86/include/asm/thread_info.h:34: error: expected specifier-qualifier-list before 'mm_segment_t'



I'm wondering if there's much downside in making the code __DO_TRACE() 
out of line so that we can make tracepoint.h have absolutely minimal 
include dependencies?

    J
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