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

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Message-ID: <20070530173353.GO15559@kernel.dk>
Date:	Wed, 30 May 2007 19:33:55 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Zach Brown <zach.brown@...cle.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Syslets, Threadlets, generic AIO support, v6

On Wed, May 30 2007, Zach Brown wrote:
> > Yeah, it'll confuse CFQ a lot actually. The threads either need to share
> > an io context (clean approach, however will introduce locking for things
> > that were previously lockless), or CFQ needs to get better support for
> > cooperating processes.
> 
> Do let me know if I can be of any help in this.

Thanks, it should not be a lot of work though.

> > For the fio testing, we can make some improvements there. Right now you
> > don't get any concurrency of the io requests if you set eg iodepth=32,
> > as the 32 requests will be submitted as a linked chain of atoms. For io
> > saturation, that's not really what you want.
> 
> Just to be clear: I'm currently focusing on supporting sys_io_*() so I'm
> using fio's libaio engine.  I'm not testing the syslet syscall interface
> yet.

Ah ok, then there's no issue from that end!

-- 
Jens Axboe

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