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

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Date:	Fri, 2 Mar 2007 14:08:21 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Pavel Machek <pavel@....cz>, Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	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>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Fri, Mar 02, 2007 at 11:56:18AM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > Even if kevent has the same speed, it still allows to handle _any_ 
> > kind of events without any major surgery - a very tiny structure of 
> > lock and list head and you can process your own kernel event in 
> > userspace with timers, signals, io events, private userspace events 
> > and others without races and invention of differnet hacks for 
> > different types - _this_ is main point.
> 
> did it ever occur to you to ... extend epoll? To speed it up? To add a 
> new wait syscall to it? Instead of introducing a whole new parallel 
> framework?

Yes, I thought about its extension more than a year ago before started 
kevent, but epoll() is absolutely based on file structure and its 
file_operations with poll methodt, so it is quite impossible to work 
with sockets to implement network AIO. Eventually it had gathered a lot 
of other systems - do we really want to have per process signalfs, timerfs 
and so on - each simple structure must be bound to a file, which becomes 
too cost.

> 	Ingo

-- 
	Evgeniy Polyakov
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