Messages in this thread | | | Date | Wed, 16 Jan 2008 16:15:41 +0530 | From | Balbir Singh <> | Subject | Re: [RFC][PATCH] per-uid/gid I/O throttling (was Re: [RFC][PATCH] per-task I/O throttling) |
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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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