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

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Message-Id: <1172513950.3280.388.camel@laptopd505.fenrus.org>
Date:	Mon, 26 Feb 2007 10:19:03 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	linux-kernel@...r.kernel.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 Mon, 2007-02-26 at 20:37 +0300, Evgeniy Polyakov wrote:

> I tend to agree.
> Yes, some loads require event driven model, other can be done using
> threads.

event driven model is really complex though. For event driven to work
well you basically can't tolerate blocking calls at all ...
open() blocks on files. read() may block on metadata reads (say indirect
blockgroups) not just on datareads etc etc. It gets really hairy really
quick that way.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
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