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

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Message-ID: <AANLkTik8r4moPy5muNyT2oKGH5aEaMOLL0Zqn=-hkpos@mail.gmail.com>
Date:	Mon, 13 Sep 2010 17:31:35 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
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" <markus.t.metzger@...el.com>
Subject: Re: [PATCH] perf_events: improve DS/BTS/PEBS buffer allocation

On Mon, Sep 13, 2010 at 5:24 PM, Peter Zijlstra <peterz@...radead.org> wrote:
> 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));
>
Ok, let try again with alloc_pages_node() + kmalloc_node().
I think we can stick with kmalloc() for DS because we are far from
consuming a page.

>
>
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