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

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Date:	Thu, 22 Feb 2007 16:29:04 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	David Miller <davem@...emloft.net>
Cc:	johnpol@....mipt.ru, arjan@...radead.org, drepper@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	hch@...radead.org, akpm@....com.au, alan@...rguk.ukuu.org.uk,
	zach.brown@...cle.com, suparna@...ibm.com, davidel@...ilserver.org,
	jens.axboe@...cle.com, tglx@...utronix.de
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3


* Ingo Molnar <mingo@...e.hu> wrote:

> > The pushback to the primary thread you speak of is just extra work 
> > in my mind, for networking.  Better to just begin operations and sit 
> > in the primary thread(s) waiting for events, and when they arrive 
> > push the operations further along using non-blocking writes, reads, 
> > and accept() calls.  There is no blocking context really needed for 
> > these kinds of things, so a mechanism that tries to provide one is a 
> > waste.
> 
> one question is, what is cheaper, to block out of a read and a write and 
                                         ^-------to back out
> to set up the event notification and then to return to the user 
> context, or to just stay right in there with all the context already 
> constructed and on the stack, and schedule away and then come back and 
> queue back to the primary thread once the condition the thread is 
> waiting for is done? The latter isnt all that unattractive in my mind, 
> because it always does forward progress, with minimal 'backout' costs.

	Ingo
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