linux-kernel - Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

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Message-ID: <Pine.LNX.4.64.0702051130590.14453@alien.or.mcafeemobile.com>
Date:	Mon, 5 Feb 2007 11:38:01 -0800 (PST)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Zach Brown <zach.brown@...cle.com>
cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-aio@...ck.org, Suparna Bhattacharya <suparna@...ibm.com>,
	Benjamin LaHaise <bcrl@...ck.org>
Subject: Re: [PATCH 2 of 4] Introduce i386 fibril scheduling

On Mon, 5 Feb 2007, Zach Brown wrote:

> > Or we need some sort of enter_context()/leave_context() (adopt mm, files,
> > ...) to have a per-CPU kthread to be able to execute the syscall from the
> > async() caller context.
> 
> I believe that's what Ingo is hoping for, yes.

Ok, but then we should ask ourselves if it's really worth to have a 
per-CPU pool (that will require quite a few changes to the current way 
of doing things), or a per-process pool (that would basically work as is). 
What advantage gives us a per-CPU pool?
Setup cost? Not really IMO. Thread creation is pretty cheap, and a typical 
process using async will have a pretty huge lifespan (compared to the pool 
creation cost).
Configurability scores for a per-process pool, because it may allow each 
process (eventually) to size his own.
What's the real point in favour of a per-CPU pool, that justify all the 
changes that will have to be done in order to adopt such concept?

- Davide

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