Messages in this thread | | | Date | Mon, 13 Sep 2010 15:42:58 -0400 | From | Mathieu Desnoyers <> | Subject | Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation |
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* Peter Zijlstra (peterz@infradead.org) wrote: > 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.
Ah ok, it's different then.
Thanks,
Mathieu
-- Mathieu Desnoyers Operating System Efficiency R&D Consultant EfficiOS Inc. http://www.efficios.com
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