linux-kernel - Re: [Patch 0/2] Renaming 'trace' to 'relay' and enhancements to 'relay'

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Message-ID: <y0mmyjqji5h.fsf@ton.toronto.redhat.com>
Date:	Wed, 06 Aug 2008 11:08:10 -0400
From:	fche@...hat.com (Frank Ch. Eigler)
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	prasad@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	dwilder@...ibm.com, hch@...radead.org,
	Steven Rostedt <rostedt@...dmis.org>,
	mathieu.desnoyers@...ymtl.ca
Subject: Re: [Patch 0/2] Renaming 'trace' to 'relay' and enhancements to 'relay'

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

> [...]
>> 	Please find the patches that enhance the 'trace' infrastructure
>> (available in the -mm tree) and which introduce two new APIs
>> relay_dump() and relay_printk().
>> [...]

> I'm a bit perplexed by these trace patches
> (http://userweb.kernel.org/~akpm/mmotm/broken-out/trace-code [...]
> Is it useful?  Will it be useful?  [...]  I haven't heard much noise
> about it and I'm struggling to justify merging it.

Right.

> Also, it's starting to look somewhat similar to ftrace, which also
> provides sort of high-bandwidth per-cpu channels into userspace for
> tracing purposes.

Perhaps ftrace ought to use this facility for its debugfs-facing bulk
data interface rather than an internal one that cannot be used by
anyone else.  Perhaps lttng could use it.  Systemtap could.  I believe
a grand unification at this level was the idea.

- FChE
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