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Bug 1251255

Summary: Avoid unbound workqueues on isolated CPUs for realtime profiles.
Product: Red Hat Enterprise Linux 7 Reporter: Daniel Bristot de Oliveira <daolivei>
Component: tunedAssignee: Jaroslav Škarvada <jskarvad>
Status: CLOSED DUPLICATE QA Contact: qe-baseos-daemons
Severity: high Docs Contact:
Priority: unspecified    
Version: 7.2CC: jeder, jskarvad
Target Milestone: rc   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-11-11 14:27:09 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Daniel Bristot de Oliveira 2015-08-06 20:11:21 UTC
Description of problem:
On RHEL-7.2 (and on v4.2 mainline kernel as well) it is possible to change the CPU affinity for unbound workqueue threads.

As it helps to reduce the load/jitter on isolated CPUs, it would be nice
to set the non-isolated CPUs as the cpumask for these threads on realtime
related profiles.

Version-Release number of selected component (if applicable):
tuned for RHEL-7.2

How reproducible:
Not applicable

Steps to Reproduce:
1. Not applicable

Actual results:
cpumask on /sys/devices/virtual/workqueue/cpumask is all CPUs.

Expected results:
cpumask on /sys/devices/virtual/workqueue/cpumask set to non-isolated
CPUs

Additional info:

Comment 2 Jaroslav Škarvada 2015-11-11 14:27:09 UTC
Closing as dupe of bug 1259043 and continuing to track the issue in bug 1259043.
It's fixed there in the 'relatime' profile which is the base for other realtime profiles.

*** This bug has been marked as a duplicate of bug 1259043 ***