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Date: Fri, 10 Jul 2009 05:53:19 +0200 From: Ingo Molnar <mingo@...e.hu> To: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Steven Rostedt <rostedt@...dmis.org> Cc: Frederic Weisbecker <fweisbec@...il.com>, Jason Baron <jbaron@...hat.com>, linux-kernel@...r.kernel.org, paulus@...ba.org Subject: Re: [PATCH 0/2] perf_counter: add tracepoint support * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote: > On Thu, 2009-07-09 at 05:10 +0200, Frederic Weisbecker wrote: > > (RFD parenthesis: why not using the one in kernel/trace for all > > perf events? Now that it is lockless, it would fit nicely > > inside: no fear about NMI context). > > because that one doesn't have a single-buffer mode you can mmap(). Yeah, the ring-buffer code could certainly be abstracted out better to allow this. Once that is done it would allow us to do a couple of nice things: such as splice support (which could perhaps be faster than mmap for perf record) and the sampling of tracepoints would become a whole lot easier a well. But it's certainly not a trivial job! Ingo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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