linux-kernel - Re: [PATCH 5 of 6] hotplug-memory: add section

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:	Fri, 04 Apr 2008 13:38:19 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Christoph Lameter <clameter@....com>
CC:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasunori Goto <y-goto@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5 of 6] hotplug-memory: add section_ops

Christoph Lameter wrote:
> Note that you could use 4k page size chunks for the memmap if its 
> virtualized (CONFIG_SPARSEMEM_VMEMMAP). Instead of a single PMD 
> pointing to a 2MB block you would have the PMD point to a block of
> ptes that would in turn point to the discontiguous series of 4k pages.
>
> The memory is virtually contiguous so all the logic stays the same. What 
> would be needed is some enhancements to the way the memmap is populated.

In Xen I think that would be accommodated by the existing 
pseudo-physical to machine mapping.  We don't support PSE anyway, so all 
the pages would be individual 4k pages; the fact that they're 
machine-discontigious is hidden because of the pseudo-phys to machine 
mapping when ptes are constructed.

    J
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/