linux-kernel - Re: [PATCH 5/6] syslets: add generic syslets infrastructure

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Date:	Wed, 09 Jan 2008 15:47:50 -0800
From:	Zach Brown <zach.brown@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Ulrich Drepper <drepper@...hat.com>,
	Arjan van de Ven <arjan@...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>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dan Williams <dan.j.williams@...il.com>,
	Jeff Moyer <jmoyer@...hat.com>,
	Simon Holm Thogersen <odie@...aau.dk>,
	suresh.b.siddha@...el.com
Subject: Re: [PATCH 5/6] syslets: add generic syslets infrastructure

Linus Torvalds wrote:
> 
> On Thu, 10 Jan 2008, Rusty Russell wrote:
>> I'd have to read his original statement, but eventfd doesn't build up state, 
>> so I think it qualifies.
> 
> How about you guys battle it out by giving an example program usign the 
> interface?
> 
> Here's a favourite really simple load of mine:
> 
>  - do the equivalent of "ls -lR" or "find /usr" as quickly as possible, 
>    without playing "sort by the inode numbers" games (that don't work in 
>    general, but are great for some filesystems)
> 
>    Do this on a directory that isn't newly created, but has had files 
>    added and removed over time (so that the return order of "readdir()" 
>    isn't dense and sorted in the inode tables already). The classic 
>    example is "ls -l /usr/bin" or similar.

Sure, that's straight forward enough.  We've all written little test
apps for variants of this load in the past, anyway.  (It was one of the
first things I did for fibrils, Ingo had a variant for syslets which
read small file data too, Chris has a syslet mode in his 'acp' util, etc.)

I was going to send out a patch series pretty soon which includes
cleanups (I think) of the sys_indirect() infrastructure.  I can throw
together this little test app along with that.

- z
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