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Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation
From: Peter Zijlstra <peterz@infradead.org>
To: Stephane Eranian <eranian@google.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>,
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Date: Mon, 13 Sep 2010 17:24:40 +0200
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On Mon, 2010-09-13 at 17:20 +0200, Stephane Eranian wrote:

> That is the case we the sizes you have chosen today. For DS, we
> could round up to one page for now.

Markus chose the BTS size, for PEBS a single page was plenty since we do
single event things (although we could do multiple for attr.precise_ip <
2).

For DS there's:
  kmalloc_node(sizeof(struct ds), GFP_KERNEL | __GFP_ZERO, cpu_node(cpu));