linux-kernel - Re: [PATCH] markers-linker-generic

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Message-ID: <y0my7kyldqt.fsf@ton.toronto.redhat.com>
Date:	11 Apr 2007 18:58:50 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	linux-kernel@...r.kernel.org, Russell King <rmk@....linux.org.uk>,
	systemtap@...rces.redhat.com
Subject: Re: [PATCH] markers-linker-generic


Andrew Morton <akpm@...ux-foundation.org> writes:

> [...]  I am told that the systemtap developers plan to (or are)
> using this infrastructure.

Indeed.

> If correct: what is their reason for preferring it over kprobes?
> [...]

It's not a preference - it's more of a supplement.  It's helpful when
some combination of such factors exists:

- kprobe int3-fault dispatching overhead orders of magnitude too high
- fault dispatching not permissible in some areas
- local context variables not easily retrievable via dwarf information
- dwarf information not available at all
- costs of permanently placed but passive marker acceptable

>From systemtap's point of view, instrumentation hooked to markers,
kprobes, and other facilities like timers, coexist just fine.  A
greater number of probe-able event sources makes for a richer tool.


- FChE
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