linux-kernel - Re: [PATCH] tracer for sys_open()

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Message-ID: <20090129150934.GF6512@elte.hu>
Date:	Thu, 29 Jan 2009 16:09:34 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	"Kok, Auke" <auke-jan.h.kok@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	powertop ml <power@...host.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	srostedt@...hat.com,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Neil Horman <nhorman@...driver.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	utrace-devel@...hat.com, Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH] tracer for sys_open() - sreadahead


* Frédéric Weisbecker <fweisbec@...il.com> wrote:

> 2009/1/29 Ingo Molnar <mingo@...e.hu>:
> >>
> >> Several people talked me about utrace and gave some examples about it in
> >> this discussion. The Api is very convenient to fetch syscall numbers,
> >> arguments and return values. And the hooks are done in the generic core
> >> code, so it is arch independent.
> >>
> >> The only drawback I can see is that it is not yet merged upstream, in
> >> need of in-kernel users. If it only depends on this condition, we could
> >> be these users...
> >>
> >> What do you think?
> >
> > sure - how do the minimal bits/callbacks look like which enable syscall
> > tracing?
> >
> >        Ingo
> 
> 
> There is a very straightforward example provided by Ananth in there:
> http://lkml.org/lkml/2009/1/28/59

I mean, how does the infrastructure patch look like - what code does this 
add to the kernel - just to get the syscall tracing bits. Lets get some 
progress here - it's clear that tracing syscalls is good, we just need to 
do it and look at actual patches.

	Ingo
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