Bug 195657 - i386: Switch Memory Layout from DISCONTIG to SPARSEMEM
i386: Switch Memory Layout from DISCONTIG to SPARSEMEM
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Kernel Maintainer List
Brian Brock
Depends On: 195391
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Reported: 2006-06-16 09:18 EDT by Prarit Bhargava
Modified: 2007-11-30 17:11 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2006-07-11 09:54:08 EDT
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Description Prarit Bhargava 2006-06-16 09:18:58 EDT
+++ 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@redhat.com on 2006-06-14 19:01 EST --
Created an attachment (id=130943)
Patch to switch to SPARSEMEM
Comment 1 Dave Jones 2006-07-11 01:36:16 EDT
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.

Comment 2 Prarit Bhargava 2006-07-11 09:54:08 EDT
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.


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