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

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Message-ID: <20070223115152.GA2565@elte.hu>
Date:	Fri, 23 Feb 2007 12:51:52 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	Ulrich Drepper <drepper@...hat.com>, 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>,
	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


* Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> [...] Those 20k blocked requests were created in about 20 seconds, so 
> roughly saying we have 1k of thread creation/freeing per second - do 
> we want this?

i'm not sure why you mention thread creation and freeing. The 
syslet/threadlet code reuses already created async threads, and that is 
visible all around in both the kernel-space and in the user-space 
syslet/threadlet code.

While Linux creates+destroys threads pretty damn fast (in about 10-15 
usecs - which is roughly the cost of getting a single 1-byte packet 
through a TCP socket from one process to another, on localhost), still 
we dont want to create and destroy a thread per request.

	Ingo
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