rainbow and pam

Benjamin M. Schwartz bmschwar at fas.harvard.edu
Sat Aug 16 17:27:55 EDT 2008


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Michael Stone wrote:
| According to "man sched_setscheduler" you want either CAP_SYS_NICE or a
| non-zero RLIMIT_RTPRIO and giving these to you means that you can
| hardlock the machine anytime by busywaiting.

As noted in a conversation with Michael, there is a potential "third way",
in the form of SCHED_ISO, isochronous scheduling.  This scheduler patch
creates a "pseudo-realtime" mode that provides lower latencies without the
potential for hardlocks.

http://ck.wikia.com/wiki/SchedulingPolicies#SCHED_ISO

- --Ben
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