linux-kernel - Re: [PATCH resend] tracing/events: convert NAPI's tracepoint via TRACE

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Message-ID: <4A9C73A4.20003@cn.fujitsu.com>
Date:	Tue, 01 Sep 2009 09:06:44 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Ingo Molnar <mingo@...e.hu>, David Miller <davem@...emloft.net>,
	Neil Horman <nhorman@...driver.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Wei Yongjun <yjwei@...fujitsu.com>,
	Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH resend] tracing/events: convert NAPI's tracepoint via
 TRACE_EVENT



Steven Rostedt wrote:
> On Mon, 31 Aug 2009, Xiao Guangrong wrote:
> 
>> - Convert NAPI's tracepoint via TRACE_EVENT macro, the output information
>>   like below:
>>
>>    sshd-2503  [000]    71.920846: napi_poll: ifname=eth0 state=0 weigth=16 poll=pcnet32_poll
>>    sshd-2503  [000]    72.020291: napi_poll: ifname=eth0 state=0 weigth=16 poll=pcnet32_poll
>>    sshd-2503  [000]    72.020418: napi_poll: ifname=eth0 state=NAPI_STATE_SCHED weigth=16 poll=pcnet32_poll
>>
>> - Remove the "DECLARE_TRACE" definiens in include/trace/define_trace.h,
>>   because TRACE_EVENT not use it
> 
> The above really needs to be in a separate patch, since it is a tracing 
> infrastructure change.
> 

Hi Steven,

We can't break this patch into two patches, because it's has redefined 'DECLARE_TRACE'
in include/trace/define_trace.h, like below:

1: if we remove 'DECLARE_TRACE' first, then NAPI's tracepoint can't define tracepoint
   (it's a NAPI tracepoint's bug,
    see my previous patch: http://marc.info/?l=linux-kernel&m=125118032931716&w=2)

2: if we convert NAPI's tracepoint first, it can't include more TRACE_EVENT .h files in
   one .c file, the compiler will complain with variables redefined:

include/trace/events/napi.h:15: error: redefinition of ‘__tpstrtab_napi_poll’
include/trace/events/napi.h:15: error: previous definition of ‘__tpstrtab_napi_poll’ was here
include/trace/events/napi.h:15: error: redefinition of ‘__tracepoint_napi_poll’
include/trace/events/napi.h:15: error: previous definition of ‘__tracepoint_napi_poll’ was here
In file included from include/trace/ftrace.h:644,

So, I think we do better fix this bug early, then other people can go on his work on ftrace.

Hi Neil,

How do you think about this patch, can you give me some comments?


Thanks,
Xiao

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