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Date: Mon, 5 May 2008 13:10:29 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: linux-kernel@vger.kernel.org, systemtap@sources.redhat.com,
       "Frank Ch. Eigler" <fche@redhat.com>
Subject: Re: System call instrumentation
Message-ID: <20080505111029.GA9948@elte.hu>
References: <20080504134838.GA21487@Krystal> <20080505065559.GD3350@elte.hu> <20080505105915.GA26444@Krystal>
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* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:

> > hm, i'm not sure about this. I've implemented system call tracing in 
> > -rt [embedded in the latency tracer] and it only needed changes in 
> > entry.S, not in every system call site. Now, granted, that tracer 
> > was simpler than what LTTng tries to do, but do we _really_ need 
> > more complexity? A trace point that simply expresses:
> > 
> >    sys_call_event(int sysno, long param1, long param2, long param3,
> >                              long param4, long param5, long param6);
> > 
> 
> That would work for all system calls that doesn't have parameters like 
> "const char __user *filename".

what's the problem with them? Do you want to follow those parameters?

	Ingo