Bug 1357997

Summary:	Enable CONFIG_SLUB_DEBUG and CONFIG_SLABINFO
Product:	Red Hat Enterprise MRG	Reporter:	Daniel Bristot de Oliveira <daolivei>
Component:	realtime-kernel	Assignee:	Luis Claudio R. Goncalves <lgoncalv>
Status:	CLOSED ERRATA	QA Contact:	Jiri Kastner <jkastner>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	2.5	CC:	bhu, lgoncalv, williams
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
Doc Text:	Feature: Enable CONFIG_SLUB_DEBUG and CONFIG_SLABINFO kernel config options to turn on SLUB allocator debugging and slab information tracking so that /proc/slabinfo is available Reason: Support engineers use the values provided by /proc/slabinfo when investigating kernel memory allocation problems. Result: MRG/R kernel will have the same debugging features as the RHEL kernel	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-01-17 18:00:45 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 2016-07-19 19:10:34 UTC

Description of problem:

The /proc/slabinfo file provides information about kernel memory consumption
via slab. This file is very helpful in the support while investigating
kernel memory consumption. Unfortunately, this file is not present on
MRG-RT kernel, although it is on RHEL-RT one.

Is it possible to enable:

CONFIG_SLUB_DEBUG=y
CONFIG_SLABINFO=y

on MRG-RT kernel? they are enabled on RHEL-RT, so it is known that they
do not cause latencies.


Version-Release number of selected component (if applicable):
3.10.0-327.rt56.190.el6rt.x86_64

How reproducible:
Always

Steps to Reproduce:
1. # cat /proc/slabinfo

Actual results:
[root@rhel6minimal ~]# cat /proc/slabinfo
cat: /proc/slabinfo: No such file or directory

Expected results:
[root@rhel6minimal ~]# cat /proc/slabinfo
<information about slab usage>

Additional info:

Comment 6 errata-xmlrpc 2017-01-17 18:00:45 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://rhn.redhat.com/errata/RHSA-2017-0113.html