linux-kernel - Re: [patch 05/11] syslets: core code

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Message-ID: <20070214210251.GA15025@elte.hu>
Date:	Wed, 14 Feb 2007 22:02:51 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.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>,
	Benjamin LaHaise <bcrl@...ck.org>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 05/11] syslets: core code


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> And the whole "lock things down in memory" approach is bad. It's doing 
> expensive things like mlock(), making the overhead for _single_ system 
> calls much more expensive. [...]

hm, there must be some misunderstanding here. That mlock is /only/ once 
per the lifetime of the whole 'head' - i.e. per sys_async_register(). 
(And you can even forget i ever did it - it's 5 lines of code to turn 
the completion ring into a swappable entity.)

never does any MMU trick ever enter the picture during the whole 
operation of this thing, and that's very much intentional.

	Ingo
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