linux-kernel - Re: [PATCHv4 5/6] Allow setting O

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Message-ID: <Pine.LNX.4.64.0711201431490.15098@alien.or.mcafeemobile.com>
Date:	Tue, 20 Nov 2007 14:33:13 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	"H. Peter Anvin" <hpa@...or.com>,
	Zach Brown <zach.brown@...cle.com>,
	Ulrich Drepper <drepper@...hat.com>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, tglx@...utronix.de,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCHv4 5/6] Allow setting O_NONBLOCK flag for new sockets

On Tue, 20 Nov 2007, Ingo Molnar wrote:

> * H. Peter Anvin <hpa@...or.com> wrote:
> 
> > It seems that you're doing the same thing in both cases, except you're 
> > now extending it to include other random functionality, which means 
> > other things than syslets are suddenly affected.
> >
> > syslets are arguably a little bit different, since what you're 
> > effectively doing there is running a miniature interpreted language in 
> > kernel space.  A higher startup overhead should be acceptable, since 
> > you're amortizing it over a larger number of calls.  Extending that 
> > mechanism suddenly means you HAVE to use that interpreted language 
> > message mechanism to access certain system calls, which really does 
> > not seem like a good thing neither for performance nor for encouraging 
> > sane design of interfaces.
> 
> whether that interpreted syslet language survives is still an open 
> question - it was extremely ugly when i wrote the first version of it 
> and it only got uglier since then :-)

Aha! You admitted it finally :)



- Davide


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