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Bug 1334459

Summary:	rt: Use IPI to trigger RT task push migration instead of pulling
Product:	Red Hat Enterprise Linux 7	Reporter:	Marcel Kolaja <mkolaja>
Component:	kernel-rt	Assignee:	Luis Claudio R. Goncalves <lgoncalv>
kernel-rt sub component:	Process management	QA Contact:	Jiri Kastner <jkastner>
Status:	CLOSED ERRATA	Docs Contact:
Severity:	medium
Priority:	high	CC:	bhu, lgoncalv, srostedt, williams
Version:	7.3	Keywords:	ZStream
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	In order to avoid thundering herd access to run-queue locks when performing task migration, a three-commit series was backported from upstream. By sending an IPI from an underutilized core to an overloaded core, requesting that the overloaded core push the task to the requesting core, the issue was avoided. The rhel-rt 7.2 and MRG kernels were missing one of the commits from the series.	Story Points:	---
Clone Of:	1332593	Environment:
Last Closed:	2016-06-23 16:31:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1332593
Bug Blocks:	1274397

Description Marcel Kolaja 2016-05-09 16:26:29 UTC

This bug has been copied from bug #1332593 and has been proposed
to be backported to 7.2 z-stream (EUS).

Comment 7 errata-xmlrpc 2016-06-23 16:31:00 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.

https://access.redhat.com/errata/RHSA-2016:1301