linux-kernel - Re: I.1 - System calls

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Date:	Tue, 14 Jul 2009 09:51:20 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Christoph Hellwig <hch@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	eranian@...il.com, LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robert Richter <robert.richter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Andi Kleen <andi@...stfloor.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>
Subject: Re: I.1 - System calls - ioctl

On Mon, Jul 13, 2009 at 12:53:13PM +0200, Peter Zijlstra wrote:
> On Mon, 2009-06-22 at 08:58 -0400, Christoph Hellwig wrote:
> > But talking about syscalls the sys_perf_counter_open prototype is
> > really ugly - it uses either the pid or cpu argument which is a pretty
> > clear indicator it should actually be two sys calls.
> 
> Would something like the below be any better?
> 
> It would allow us to later add something like PERF_TARGET_SOCKET and
> things like that.
> 
> (utterly untested)

And makes the code a couple of magnitudes more ugly..  If you really
add a completely new targer adding a new system call wouldn't be a big
issue.  Altough a socket seems like a pretty logical flag extension to
the cpu syscall (or sub-syscall currently), as it would still be
specified as trace the whole cpu socket for this given cpuid.

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