linux-kernel - Re: [PATCH 5/6] perf_counter: kerneltop: mmap

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Message-ID: <20090325121811.GC11571@elte.hu>
Date:	Wed, 25 Mar 2009 13:18:11 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH 5/6] perf_counter: kerneltop: mmap_pages argument


* Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> provide a knob to set the number of mmap data pages.

> +	" -m pages  --mmap_pages=<pages> # number of mmap data pages\n"

Btw., we really want this to be auto-tuning to a large degree. If 
the kernel observes missed events, it should create a 
PERF_EVENT_OVERFLOW==0x3 record, with the number of missed events - 
or something like that.

	Ingo
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