Date: Wed, 16 Jan 2008 16:15:41 +0530
From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: Andrea Righi <righiandr@users.sourceforge.net>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>, Valdis.Kletnieks@vt.edu,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC][PATCH] per-uid/gid I/O throttling (was Re: [RFC][PATCH]
	per-task I/O throttling)
Message-ID: <20080116104541.GB25724@balbir.in.ibm.com>
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	Peter Zijlstra <a.p.zijlstra@chello.nl>, Valdis.Kletnieks@vt.edu,
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* Andrea Righi <righiandr@users.sourceforge.net> [2008-01-15 17:49:36]:

> Allow to limit the I/O bandwidth for specific uid(s) or gid(s) imposing
> additional delays on those processes that exceed the limits defined in a
> configfs tree.
> 
> Examples:
> 
> Limit the I/O bandwidth for user www-data (UID 33) to 4MB/s:
> 
> root@linux:/config/io-throttle# mkdir uid:33
> root@linux:/config/io-throttle# cd uid:33/
> root@linux:/config/io-throttle/uid:33# cat io-rate
>      io-rate: 0 KiB/sec
>    requested: 0 KiB
> last_request: 0 jiffies
>        delta: 388202 jiffies
> root@linux:/config/io-throttle/uid:33# echo 4096 > io-rate
> root@linux:/config/io-throttle/uid:33# cat io-rate
>      io-rate: 4096 KiB/sec
>    requested: 0 KiB
> last_request: 389271 jiffies
>        delta: 91 jiffies
> 
> Limit the I/O bandwidth of group backup (GID 34) to 512KB/s:
> 
> root@linux:/config/io-throttle# mkdir gid:34
> root@linux:/config/io-throttle# cd gid:34/
> root@linux:/config/io-throttle/gid:34# cat io-rate
>      io-rate: 0 KiB/sec
>    requested: 0 KiB
> last_request: 0 jiffies
>        delta: 403160 jiffies
> root@linux:/config/io-throttle/gid:34# echo 512 > io-rate
> root@linux:/config/io-throttle/gid:34# cat io-rate
>      io-rate: 512 KiB/sec
>    requested: 0 KiB
> last_request: 403618 jiffies
>        delta: 80 jiffies
> 
> Remove the I/O limit for user www-data:
> 
> root@linux:/config/io-throttle# echo 0 > uid:33/io-rate
> root@linux:/config/io-throttle# cat uid:33/io-rate
>      io-rate: 0 KiB/sec
>    requested: 0 KiB
> last_request: 419009 jiffies
>        delta: 568 jiffies
> 
> or:
> 
> root@linux:/config/io-throttle# rmdir uid:33
> 
> Future improvements:
> * allow to limit also I/O operations per second (instead of KB/s only)
> * extend grouping criteria (allow to define rules based on process containers,
>   process command, etc.) 
> 
> Signed-off-by: Andrea Righi <a.righi@cineca.it>

Hi, Andrea,

Thanks for doing this. I am going to review the patches in greater
detail and also test them. Why do you use configfs when we have a
control group filesystem available for grouping tasks and providing a
file system based interface for control and accounting?

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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