[LAD] BFS and lennart's realtimekit idea...

Jörn Nettingsmeier nettings at folkwang-hochschule.de
Thu Oct 22 16:12:33 UTC 2009

[paul, i assume this was meant for the list?]

Paul Davis wrote:
> 2009/10/22 Jörn Nettingsmeier <nettings at folkwang-hochschule.de>:
>> hi everyone!
> this:
>> A feature of BFS is that it detects when an application tries to obtain a
>> realtime policy (SCHED_RR or SCHED_FIFO) and the caller does not have the
>> appropriate privileges to use those policies. When it detects this, it will
>> give the task SCHED_ISO policy instead. Thus it is transparent to the user.
>> Because some applications constantly set their policy as well as their nice
>> level, there is potential for them to undo the override specified by the user
>> on the command line of setting the policy to SCHED_ISO. To counter this, once
>> a task has been set to SCHED_ISO policy, it needs superuser privileges to set
>> it back to SCHED_NORMAL.
> doesn't sound like linux or linus style of policy to me. i'll be
> interested to see what happens.

yeah, that's not exactly a touch of genius, but con's user base are,
well, users. making stuff out of the box is how he attracts testers.
in the long run, this should be a limits.conf thing, but in his position
, "wait for your distro to make this work" is a non-starter.

if bfs ever makes it into mainline, this behaviour will surely be shot
down. but the rest sounds interesting. i wonder how the new deadline
scheduler will compare.

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