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Date: Tue, 17 Dec 2002 11:32:29 -0800
From: "H. Peter Anvin" <hpa@transmeta.com>
Organization: Transmeta Corporation
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To: Linus Torvalds <torvalds@transmeta.com>
CC: Ulrich Drepper <drepper@redhat.com>,
       Matti Aarnio <matti.aarnio@zmailer.org>,
       Hugh Dickins <hugh@veritas.com>, Dave Jones <davej@codemonkey.org.uk>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
Subject: Re: Intel P6 vs P7 system call performance
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Linus Torvalds wrote:
> 
> On Tue, 17 Dec 2002, Linus Torvalds wrote:
> 
>>Hmm.. Which system calls have all six parameters? I'll have to see if I
>>can find any way to make those use the new interface too.
> 
> 
> The only ones I found from a quick grep are
>  - sys_recvfrom
>  - sys_sendto
>  - sys_mmap2()
>  - sys_ipc()
> 
> and none of them are of a kind where the system call entry itself is the
> biggest performance issue (and sys_ipc() is deprecated anyway), so it's
> probably acceptable to just use the old interface for them.
> 

recvfrom() and sendto() can also be implemeted as sendmsg() recvmsg() if
one really wants to.

What one can also do is that a sixth argument, if one exists, is passed
on the stack (i.e. in (%ebp), since %ebp contains the stack pointer.)

	-hpa

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