linux-kernel - Re: [perfmon] Re: [perfmon2] perfmon2 merge news

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Message-Id: <20071114.172722.71465976.davem@davemloft.net>
Date:	Wed, 14 Nov 2007 17:27:22 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paulus@...ba.org
Cc:	hch@...radead.org, akpm@...ux-foundation.org, gregkh@...e.de,
	mucci@...utk.edu, eranian@....hp.com, wcohen@...hat.com,
	robert.richter@....com, linux-kernel@...r.kernel.org,
	andi@...stfloor.org
Subject: Re: [perfmon] Re: [perfmon2] perfmon2 merge news

From: Paul Mackerras <paulus@...ba.org>
Date: Thu, 15 Nov 2007 12:11:10 +1100

> The third (hard to extend cleanly) is a good point, and is a valid
> criticism of the current set of perfmon2 system calls, I think.
> However, the goal of being able to extend the interface tends to be in
> opposition to the goal of having strong typing of the interface.
> Things like a multiplexed syscall or an ioctl are much easier to
> extend but that is at the expense of losing strong typing.

I disagree.

With netlink we can just add new attributes when a new need arises for
a particular interface.  The attribute code describes the type
precisely, so there is no loss of strong typing at all.
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