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

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Message-ID: <20070221230351.GC32031@elte.hu>
Date:	Thu, 22 Feb 2007 00:03:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Michael K. Edwards" <medwards.linux@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"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

* Michael K. Edwards <medwards.linux@...il.com> wrote:

> 1) Documentation of what you can and can't do safely from a threadlet, 
> given that it runs in an unknown thread context;

you can do just about anything from a threadlet, using bog standard 
procedural programming. (Certain system-calls are excluded at the moment 
out of caution - but i'll probably lift restrictions like sys_clone() 
use because sys_clone() can be done safely from a threadlet.)

The code must be thread-safe, because the kernel can move execution to a 
new thread anytime and then it will execute in parallel with the main 
thread. There's no other requirement.

Wrt. performance, one good model is to run request-alike functionality 
from a threadlet, to maximize parallelism.

	ingo
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