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

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Message-ID: <20070531093449.GN32105@kernel.dk>
Date:	Thu, 31 May 2007 11:34:51 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6

On Thu, May 31 2007, Ingo Molnar wrote:
> 
> * 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)

See also:

http://lkml.org/lkml/2006/6/16/144

which originates from a much simpler patch I did to fix performance
regressions in this area for the SLES10 kernel.

-- 
Jens Axboe

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