Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation

[Peter Zijlstra]

On Mon, 2010-09-13 at 15:31 -0400, Mathieu Desnoyers wrote:
> > Ok, so can we play the same trick you're playing with the sampling
> > buffer, i.e., you use alloc_pages_node() for one page at a time, and
> > then you stitch them on demand via SW?
> 
> Well, a thought is striking me: it sounds like you are re-doing YAORB (short
> for Yet Another Ring Buffer, 

He's not.. the hardware needs a large (virtually) contiguous region to
poke data into, we need to read it out from NMI context.
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