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Bug 1131631

Summary:	Incorrect Description of the /proc/buddyinfo file
Product:	Red Hat Enterprise Linux 6	Reporter:	Jaromir Hradilek <jhradile>
Component:	doc-Deployment_Guide	Assignee:	Stephen Wadeley <swadeley>
Status:	CLOSED CURRENTRELEASE	QA Contact:	ecs-bugs
Severity:	medium	Docs Contact:
Priority:	medium
Version:	6.7	CC:	eliedebrauwer
Target Milestone:	rc	Keywords:	Documentation
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-07-23 10:38:35 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 Jaromir Hradilek 2014-08-19 17:22:09 UTC

In the section that describes the /proc/buddyinfo file [1], the Deployment Guide for Red Hat Enterprise Linux 6 explains three rows: DMA, Normal, and HighMem. This is, however, insufficient because on 64-bit systems, the file can also contain a row to represent DMA32. In addition, the HighMem row is only available on 32-bit systems and the Normal row has a different meaning.
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[1] https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Deployment_Guide/s1-proc-topfiles.html#s2-proc-buddyinfo

Comment 1 Elie De Brauwer 2014-08-20 08:34:53 UTC

Jaromir,

Indeed the section is very specific to i386 architecture, I'm currently using an ARM (i.mx6) device where I have 192 megabyte in my DMA region. So it would be worth to at least mention that this could differ depending on the memory layouts used which in turn depends on the architecture. Or to specify that this example mainly applies to i386 alikes.

my 2 cents
E.