linux-kernel - Re: [PATCH] [RFC] tracehook: Hook in syscall tracing markers.

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Date:	Mon, 22 Sep 2008 21:22:19 -0400
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	"Frank Ch. Eigler" <fche@...hat.com>
Cc:	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH] [RFC] tracehook: Hook in syscall tracing markers.

* Frank Ch. Eigler (fche@...hat.com) wrote:
> Hi -
> 
> > At kernel summit, the idea that syscall tracing was generally desirable
> > for tracing was mentioned several times, as was the argument that kernel
> > developers aren't placing markers in meaningful locations. This is a
> > simple patch to try and do that for the syscall case.[...]
> 
> One problem with this is that a separate mechanism would be needed to
> activate these tracehook_report_* calls in the first place: the
> management of the per-task TIF_SYSCALL_TRACE flag.  This is one of the
> things the utrace API makes straightforward, in which case its own
> native syscall reporting callbacks can be used directly.
> 
> - FChE
> 

There is already a series of patches in the -lttng tree which adds
TIF_KERNEL_TRACE to every architecture. It basically enables syscall
tracing for every threads running on the system.

It't the best way I found to do system-wide syscall tracing without
changing anything of the assembly code except adding one flag to the
tested flags.

Mathieu


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Mathieu Desnoyers
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