* Andrea Righi <[EMAIL PROTECTED]> [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:
>
> [EMAIL PROTECTED]:/config/io-throttle# mkdir uid:33
> [EMAIL PROTECTED]:/config/io-throttle# cd uid:33/
> [EMAIL PROTECTED]:/config/io-throttle/uid:33# cat io-rate
> io-rate: 0 KiB/sec
> requested: 0 KiB
> last_request: 0 jiffies
> delta: 388202 jiffies
> [EMAIL PROTECTED]:/config/io-throttle/uid:33# echo 4096 > io-rate
> [EMAIL PROTECTED]:/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:
>
> [EMAIL PROTECTED]:/config/io-throttle# mkdir gid:34
> [EMAIL PROTECTED]:/config/io-throttle# cd gid:34/
> [EMAIL PROTECTED]:/config/io-throttle/gid:34# cat io-rate
> io-rate: 0 KiB/sec
> requested: 0 KiB
> last_request: 0 jiffies
> delta: 403160 jiffies
> [EMAIL PROTECTED]:/config/io-throttle/gid:34# echo 512 > io-rate
> [EMAIL PROTECTED]:/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:
>
> [EMAIL PROTECTED]:/config/io-throttle# echo 0 > uid:33/io-rate
> [EMAIL PROTECTED]:/config/io-throttle# cat uid:33/io-rate
> io-rate: 0 KiB/sec
> requested: 0 KiB
> last_request: 419009 jiffies
> delta: 568 jiffies
>
> or:
>
> [EMAIL PROTECTED]:/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 <[EMAIL PROTECTED]>
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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