linux-kernel - Re: Syslets, Threadlets, generic AIO support, v6

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Message-ID: <20070531093202.GA4784@elte.hu>
Date:	Thu, 31 May 2007 11:32:02 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Jeff Garzik <jeff@...zik.org>,
	Zach Brown <zach.brown@...cle.com>,
	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>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6


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

> (i definitely remember having written code for that too, but i cannot 
> find that in the archives. hm.) In theory we could avoid _all_ 
> fd-bitmap overhead as well and use a per-process list/pool of struct 
> file buffers plus a maximum-fd field as the 'non-linear fd allocator' 
> (at the price of only deallocating them at process exit time).

btw., this also allows mostly-lockless fd allocation, which would 
probably benefit threaded apps too. (we can just recycle it from a 
per-CPU list of cached fds for that process)

	Ingo
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