linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Date:	Tue, 6 Mar 2007 09:19:35 +0100
From:	Pavel Machek <pavel@....cz>
To:	Kirk Kuchov <kirk.kuchov@...il.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Ingo Molnar <mingo@...e.hu>,
	Eric Dumazet <dada1@...mosbay.com>,
	Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

> >As for why common abstractions like file are a good thing, think about why
> >having "/dev/null" is cleaner that having a special plug DEVNULL_FD fd
> >value to be plugged everywhere,
> 
> This is a stupid comparaison. By your logic we should also have /dev/stdin,
> /dev/stdout and /dev/stderr.

Bzzt, wrong. We have them.

pavel@amd:~$ ls -al /dev/std*
lrwxrwxrwx 1 root root 4 Nov 12  2003 /dev/stderr -> fd/2
lrwxrwxrwx 1 root root 4 Nov 12  2003 /dev/stdin -> fd/0
lrwxrwxrwx 1 root root 4 Nov 12  2003 /dev/stdout -> fd/1
pavel@amd:~$ ls -al /proc/self/fd
total 0
dr-x------ 2 pavel users  0 Mar  6 09:18 .
dr-xr-xr-x 4 pavel users  0 Mar  6 09:18 ..
lrwx------ 1 pavel users 64 Mar  6 09:18 0 -> /dev/ttyp2
lrwx------ 1 pavel users 64 Mar  6 09:18 1 -> /dev/ttyp2
lrwx------ 1 pavel users 64 Mar  6 09:18 2 -> /dev/ttyp2
lr-x------ 1 pavel users 64 Mar  6 09:18 3 -> /proc/2299/fd
pavel@amd:~$

> >But here the list could be almost endless.
> >And please don't start the, they don't scale or they need heavy file
> >binding tossfeast. They scale as well as the interface that will receive
> >them (poll, select, epoll). Heavy file binding what? 100 or so bytes for
> >the struct file? How many signal/timer fd are you gonna have? Like 100K?
> >Really moot argument when opposed to the benefit of being compatible with
> >existing POSIX interfaces and being more Unix friendly.
> 
> So why the HELL don't we have those yet? Why haven't you designed
> epoll with those in mind? Why don't you back your claims with patches?
> (I'm not a kernel developer.)

Either stop flaming kernel developers or become one. It is  that
simple.

								Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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