Bug 1505158 - RFE: Improve RT throttling mechanism [rhel-7.4.z]
Summary: RFE: Improve RT throttling mechanism [rhel-7.4.z]
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kernel-rt
Version: 7.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: rc
: ---
Assignee: Clark Williams
QA Contact: Jiri Kastner
Keywords: FutureFeature, ZStream
Depends On: 1401061
TreeView+ depends on / blocked
Reported: 2017-10-22 16:07 UTC by Oneata Mircea Teodor
Modified: 2017-11-30 16:03 UTC (History)
10 users (show)

The current realtime throttling mechanism prevents the starvation of non-realtime tasks by CPU-intensive realtime tasks. When a realtime run queue is throttled, it allows non-realtime tasks to run. If there are not non-realtime tasks, the CPU goes idle. To safely maximize CPU usage by decreasing the CPU idle time, the RT_RUNTIME_GREED scheduler feature has been implemented. When enabled, this feature checks if non-realtime tasks are starving before throttling the realtime task. The RT_RUNTIME_GREED scheduler option guarantees some run time on all CPUs for the non-realtime tasks, while keeping the realtime tasks running as much as possible.
Clone Of: 1401061
Last Closed: 2017-11-30 16:03:50 UTC

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:3322 normal SHIPPED_LIVE Moderate: kernel-rt security, bug fix, and enhancement update 2017-11-30 20:18:55 UTC

Description Oneata Mircea Teodor 2017-10-22 16:07:13 UTC
This bug has been copied from bug #1401061 and has been proposed to be backported to 7.4 z-stream (EUS).

Comment 9 errata-xmlrpc 2017-11-30 16:03:50 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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