linux-kernel - Re: [PATCH 0/3] A kernel tracing interface

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Message-Id: <20080228020437.8f99f646.akpm@linux-foundation.org>
Date:	Thu, 28 Feb 2008 02:04:37 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"David J. Wilder" <dwilder@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, systemtap@...rceware.org,
	prasadav@...ibm.com, hch@...radead.org
Subject: Re: [PATCH 0/3] A kernel tracing interface

On Tue, 26 Feb 2008 14:38:37 -0800 "David J. Wilder" <dwilder@...ibm.com> wrote:

> These patches provide a kernel tracing interface called "trace".
> 
> ChangeLog:
> -Updated to 2.6.25-rc2-mm1
> -Removed sem_watch example, to hard to maintain.
> -Added a new example that demonstrates per-cpu continuous tracing
>  of data generated using marker probes.
> -Removed inline from relay patch.
> -Moved examples into /sample directory.
> 
> The motivation for "trace" is to:
> - Provide a simple set of tracing primitives that will utilize the high-
>   performance and low-overhead of relayfs for passing traces data from
>   kernel to user space.
> - Provide a common user interface for managing kernel traces.
> - Allow for binary as well as ascii trace data.
> - Incorporate features from the systemtap runtime that are
>   useful to others.

So... what's the story on this versus lttng?

Is there some userspace code available for people to test this?  Maybe it's
mentioned and I missed it.

It'd be interesting to see a writeup of the proposed kernel<->userspace
interfaces.  I see a description of kernel-internal interfaces, but how do
users use it?

I see it uses things from blktrace.  Can blktrace be switched over to being
a client of this code?

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