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Message-ID: <7c86c4470812151258m11b7185sbd629a82c91778bb@mail.gmail.com>
Date: Mon, 15 Dec 2008 21:58:10 +0100
From: "stephane eranian" <eranian@googlemail.com>
Reply-To: eranian@gmail.com
To: "Ingo Molnar" <mingo@elte.hu>
Subject: Re: [patch] Performance Counters for Linux, v3
Cc: "Peter Zijlstra" <a.p.zijlstra@chello.nl>,
       "Vince Weaver" <vince@deater.net>, linux-kernel@vger.kernel.org,
       "Thomas Gleixner" <tglx@linutronix.de>,
       "Andrew Morton" <akpm@linux-foundation.org>,
       "Eric Dumazet" <dada1@cosmosbay.com>,
       "Robert Richter" <robert.richter@amd.com>,
       "Arjan van de Veen" <arjan@infradead.org>,
       "Peter Anvin" <hpa@zytor.com>, "Paul Mackerras" <paulus@samba.org>,
       "David S. Miller" <davem@davemloft.net>
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Hi,

On Mon, Dec 15, 2008 at 12:13 AM, Ingo Molnar <mingo@elte.hu> wrote:
> We've implemented the essence of these variants, with sharing the resource
> being the sane default, and with the sysadmin also having a configuration
> vector to reserve the resource to himself permanently. (There could be
> more variations of this.)
>
Reading the v4 code, it does not appear the sysadmin can specify which
resource to reserve. The current code reserves a number of counters.
This is problematic with hardware where not all counters can measure
everything, or when not all PMU registers are counters.
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