linux-kernel - Re: [patch 3/4] Linux Kernel Markers

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Message-ID: <y0my7ggldi9.fsf@ton.toronto.redhat.com>
Date:	12 Aug 2007 16:11:10 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 3/4] Linux Kernel Markers - Documentation

Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> writes:

> [...]
> +A marker placed in your code provides a hook to call a function (probe) that
> +you can provide at runtime. A marker can be "on" (a probe is connected to it)
> +or "off" (no probe is attached). When a marker is "off" it has no
> +effect. [...]

Add something like, ", except for a (how?) small time/space penalty."

> +[...]
> +trace_mark(subsystem_event, "%d %s", someint, somestring);
> +Where :
> +- subsystem_event is an identifier unique to your event
> +    - subsystem is the name of your subsystem.
> +    - event is the name of the event to mark.
> +[...]

It would be useful to clarify that this "subsystem_event" scheme is
only a suggested naming convention intended to limit collisions.

> +Connecting a function (probe) to a marker is done by providing a
> probe +(function to call) for the specific marker through
> marker_probe_register() and +can be activated by calling
> marker_arm().

It would help to spell out the nature of the marker namespace.  Is it
global to the kernel?  Per-module?  Are conflicting "subsystem_event"
names but different format strings considered separate markers?

> + [...] Marker disactivation [...]

"deactivation"

- FChE
-
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