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

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Message-Id: <82AD23D8-E5BE-4B69-A602-1B474EC0C4EA@mac.com>
Date:	Sun, 4 Mar 2007 12:46:00 -0500
From:	Kyle Moffett <mrmacman_g4@....com>
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>,
	Pavel Machek <pavel@....cz>, 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

On Mar 04, 2007, at 11:23:37, Kirk Kuchov wrote:
> So here we are, 2007. epoll() works with files, pipes, sockets,  
> inotify and anything pollable (file descriptors) but aio, timers,  
> signals and user-defined event. Can we please get those working  
> with epoll ? Something as simple as:
>
> [code snipped]
>
> Would this be acceptable? Can we finally move on?

Well, even this far into 2.6, Linus' patch from 2003 still (mostly)  
applies; the maintenance cost for this kind of code is virtually  
zilch.  If it matters that much to you clean it up and make it apply;  
add an alarmfd() syscall (another 100 lines of code at most?) and  
make a "read" return an architecture-independent siginfo-like  
structure and submit it for inclusion.  Adding epoll() support for  
random objects is as simple as a 75-line object-filesystem and a 25- 
line syscall to return an FD to a new inode.  Have fun!  Go wild!   
Something this trivially simple could probably spend a week in -mm  
and go to linus for 2.6.22.

Cheers,
Kyle Moffett

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