MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-ID: <18881.29300.669876.820286@cargo.ozlabs.ibm.com>
Date: Thu, 19 Mar 2009 09:15:16 +1100
From: Paul Mackerras <paulus@samba.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@elte.hu, rostedt@goodmis.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC][PATCH 09/11] perf_counter: revamp syscall input ABI
In-Reply-To: <1237366063.5069.64.camel@laptop>
References: <20090317215606.037073805@chello.nl>
	<20090317220421.336322251@chello.nl>
	<18880.23662.233043.833458@drongo.ozlabs.ibm.com>
	<1237366063.5069.64.camel@laptop>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 839
Lines: 21

Peter Zijlstra writes:

> Ah, I thought we should keep a pure 64 bit raw value. You never know
> what hardware will do.

Oh I see, you use hw_event->raw_event if hw_event->raw is set.  I
missed that before.

Still, you're putting that into hwc->config along with other bits like
ARCH_PERFMON_EVENTSEL_USR and ARCH_PERFMON_EVENTSEL_OS, so I would
think we could spare two bits for the type, leaving 62 bits for the
raw event code.  And if that isn't enough, there's the
hw_event.extra_config_len field, which allows userspace to pass in
arbitrary amounts of extra PMU configuration data.

Paul.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/