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

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Message-ID: <1284391480.2275.350.camel@laptop>
Date:	Mon, 13 Sep 2010 17:24:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, paulus@...ba.org,
	davem@...emloft.net, perfmon2-devel@...ts.sf.net,
	eranian@...il.com, robert.richter@....com,
	markus.t.metzger@...el.com,
	"markus.t.metzger" <markus.t.metzger@...el.com>
Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation

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));


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