linux-kernel - Re: [announce] Performance Counters for Linux, v6

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Message-Id: <1235170078.4736.42.camel@laptop>
Date:	Fri, 20 Feb 2009 23:47:58 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stephane Eranian <eranian@...glemail.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Richter <robert.richter@....com>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Anvin <hpa@...or.com>, Paul Mackerras <paulus@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Mike Galbraith <efault@....de>
Subject: Re: [announce] Performance Counters for Linux, v6

On Fri, 2009-02-20 at 14:38 -0800, Corey Ashford wrote:
> There may be other non-event-related changes that will not be handled 
> quite as well in this way.  In the original email I hinted at that we 
> may want an option for mmap'd sample buffers at some point, and so I'm 
> not clear how you'd provide an ABI to request mmap'd buffers (you would 
> probably need to be able to request the size and get back a pointer to 
> the mmap'd buffer).  Would this be done through a special 
> sys_perf_counter_open call?  Or through a subsequent ioctl call on the 
> group leader after an open (which requires the counters to be initially 
> disabled), etc.

What's stopping a regular mmap() call using the fd obtained from
sys_perf_counter_open() ?



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