linux-kernel - Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108

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Message-ID: <450ABA2A.9060406@opersys.com>
Date:	Fri, 15 Sep 2006 10:35:22 -0400
From:	Karim Yaghmour <karim@...rsys.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Roman Zippel <zippel@...ux-m68k.org>,
	Tim Bird <tim.bird@...sony.com>, Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...l.org>, Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Zanussi <zanussi@...ibm.com>, ltt-dev@...fik.org,
	Michel Dagenais <michel.dagenais@...ymtl.ca>
Subject: Re: [PATCH 0/11] LTTng-core (basic tracing infrastructure) 0.5.108


Alan Cox wrote:
> In the meantime perhaps the saner members of the static trace brigade
> can explain why gcc debug data isn't good enough for them when its good
> enough for kgdb to do single stepping at source level and variable
> printing ?

Care to explain how I can use to implement the equivalent of this:

@@ -1709,6 +1712,7 @@ switch_tasks:
   		++*switch_count;

   		prepare_arch_switch(rq, next);
+		TRACE_SCHEDCHANGE(prev, next);
   		prev = context_switch(rq, prev, next);
   		barrier();

Also, care to explain how kprobes can be used to access same data
without having to actually customize a probe point for every binary?

Thanks,

Karim
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