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Message-ID: <20080922012841.GA6199@redhat.com>
Date:	Sun, 21 Sep 2008 21:28:41 -0400
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Paul Mundt <lethal@...ux-sh.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	Roland McGrath <roland@...hat.com>
Subject: Re: [PATCH] [RFC] tracehook: Hook in syscall tracing markers.

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
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