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

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Message-Id: <200711141128.59758.nickpiggin@yahoo.com.au>
Date:	Wed, 14 Nov 2007 11:28:59 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	David Miller <davem@...emloft.net>
Cc:	paulus@...ba.org, 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

On Wednesday 14 November 2007 23:07, David Miller wrote:
> From: Paul Mackerras <paulus@...ba.org>
> Date: Wed, 14 Nov 2007 23:03:24 +1100
>
> > You're suggesting that the behaviour of a read() should depend on what
> > was in the buffer before the read?  Gack!  Surely you have better
> > taste than that?
>
> Absolutely that's what I mean, it's atomic and gives you exactly what
> you need.
>
> I see nothing wrong or gross with these semantics.  Nothing in the
> "book of UNIX" specifies that for a device or special file the passed
> in buffer cannot contain input control data.

True, but is it now any so different to an ioctl?
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