linux-kernel - Re: [PATCH v2 0/2] ftrace: Add task_comm support for trace

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Date:	Mon, 25 May 2009 16:59:26 +0800
From:	"Zhaolei" <zhaolei@...fujitsu.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Frederic Weisbecker" <fweisbec@...il.com>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	"Tom Zanussi" <tzanussi@...il.com>,
	"LKML" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] ftrace: Add task_comm support for trace_event

* From: "Ingo Molnar" <mingo@...e.hu>
> 
> it still fails to build:
> 
> kernel/built-in.o: In function `ftrace_event_enable_disable':
> trace_events.c:(.text+0x4df08): undefined reference to `tracing_stop_cmdline_record'
> trace_events.c:(.text+0x4df1f): undefined reference to `tracing_start_cmdline_record'
> 
> config attached.

Hello, Ingo

Thanks for your report.

I found reason.
It is because CONFIG_TRACING is on(But CONFIG_FTRACE is off),
which compiles trace_events but leaves trace_sched_switch.
(It is different with problem that I fixed in v1->v2, but... sorry......)

I have fixed it, I'll send v3 after following test:
1: CONFIG_TRACING on, CONFIG_FTRACE off
2: CONFIG_ENABLE_EVENT_TRACING on, CONFIG_ENABLE_CONTEXT_SWITCH_TRACER off
2: CONFIG_ENABLE_EVENT_TRACING on, CONFIG_ENABLE_CONTEXT_SWITCH_TRACER on

And RFC:
IMHO, trace_sched_switch should not have relationship with trace_events,
in other words, trace_events should run without trace_sched_switch linked.

Can we move codes for record cmdline out of trace_sched_switch.c and put them
into new cmdline_record.c?
Then, trace_functions.c and trace_events.c will only need cmdline_record.c.

Thanks
Zhaolei