Bug 195657

Summary:	i386: Switch Memory Layout from DISCONTIG to SPARSEMEM
Product:	[Fedora] Fedora	Reporter:	Prarit Bhargava <prarit>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED WONTFIX	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	davej, konradr, wtogami
Target Milestone:	---
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2006-07-11 13:54:08 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:	195391
Bug Blocks:

Description Prarit Bhargava 2006-06-16 13:18:58 UTC

+++ This bug was initially created as a clone of Bug #195391 +++

Description of problem:

It's time that we make the switch.  According to upstream reports SPARSEMEM will
eventually replace DISCONTIG.  However, testing of platforms has become a 
blocker for this... let's switch Fedora over and see what happens.  

I've tested on various x86_64 platforms (a couple of Dells, a few HPs, an IBM
box) and haven't seen any issues.

-- Additional comment from prarit on 2006-06-14 19:01 EST --
Created an attachment (id=130943)
Patch to switch to SPARSEMEM

Comment 1 Dave Jones 2006-07-11 05:36:16 UTC

x86-64 is now done (for the last week or so), nothing bad seems to have happened
so far.   i386 lacks this (or discontigmem) due to the absense of CONFIG_NUMA.

I'm not convinced that setting NUMA on i386 is a good idea.
In fact, from what I understand so far, it strikes me as a bad idea.

http://www.x86-64.org/lists/discuss/msg09335.html

Comment 2 Prarit Bhargava 2006-07-11 13:54:08 UTC

I think we can drop this.  The underlying issue behind switching to SPARSE is
memory hotplug which appears to only effect ia64, x86_64, and ppc/64.

P.