linux-kernel - Re: perf events over (net) console?

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Date:	Thu, 9 Sep 2010 13:40:59 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Harald Gustafsson <hgu1972@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Harald Gustafsson <harald.gustafsson@...csson.com>,
	Song Yuan <song.yuan@...csson.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: perf events over (net) console?

On Thu, Sep 09, 2010 at 01:35:42PM +0200, Peter Zijlstra wrote:
> On Thu, 2010-09-09 at 13:29 +0200, Frederic Weisbecker wrote:
> > But if we bring the splice support,
> 
> Even simply write() from the mmap() buffer isn't terribly expensive. But
> yeah, once we fix splice not to always copy that could be even better.
> 
> Splice() is on the todo list, but it needs significant user-interface
> work and I'm rather busy..


Yeah sure, that wasn't a citicism, just an idea on how that kind of
minimal userspace noise state can be achieved in the future :)

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