lkml.org 
[lkml]   [2008]   [Jan]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [RFC][PATCH] per-uid/gid I/O throttling (was Re: [RFC][PATCH] per-task I/O throttling)
    Date
    Balbir Singh wrote:
    > * 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?
    >

    Well... I didn't choose configfs for a technical reason, but simply
    because I'm more familiar with it, respect to the other equivalent ways
    to implement this. But I'll try to look also at the control group
    approach, I don't know in details all the advantages/disadvantages, but
    it seems interesting anyway.

    -Andrea


    \
     
     \ /
      Last update: 2008-01-16 14:01    [W:0.028 / U:30.528 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site