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Bug 584297

Summary: RT Tuning Guide: Reorganise the latency tracing sections - 3.7 and 3.8
Product: Red Hat Enterprise MRG Reporter: David Sommerseth <davids>
Component: Realtime_Tuning_GuideAssignee: Alison Young <alyoung>
Status: CLOSED CURRENTRELEASE QA Contact: MRG Quality Engineering <mrgqe-bugs>
Severity: medium Docs Contact:
Priority: low    
Version: DevelopmentCC: bche, lgoncalv, ovasik
Target Milestone: 2.0   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-06-24 03:01:12 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: 652506    
Bug Blocks: 660531, 689677    

Description David Sommerseth 2010-04-21 10:02:54 UTC 
I would suggest to rearrange the common information in "3.7. Using the ftrace Utility for Tracing Latencies" and "3.8. Latency Tracing Using trace-cmd".

The part which can be unified is mounting of /sys/kernel/debug.  The part which can be moved into this new section before todays 3.7 and 3.8 can be taken from 3.8:

------------------------------------------------------------------------------
Mount the kernel to /sys/kernel/debug and instruct it to use the debugfs file system.

# mount -t debugfs nodev /sys/kernel/debug

You can choose to make the debugfs directory mount automatically on boot. You can do this by opening the /etc/fstab file in your preferred text editor, and adding the following line:

nodev /sys/kernel/debug	   debugfs   defaults   0  0
------------------------------------------------------------------------------

In section 3.7, paragraph "1. Once the trace variant of the MRG Realtime kernel is installed and in use..." can be taken out.  The same for the corresponding part in 3.8.
Comment 1 Lana Brindley 2010-06-21 03:58:35 UTC 
This document has already been translated for 1.3. This change is now scheduled for 1.4.

LKB
Comment 4 David Sommerseth 2011-06-22 13:27:42 UTC 
This section edited here looks fine for me.
-> VERIFIED