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
| ||
|
Date: Tue, 20 Nov 2007 17:16:11 -0800 (PST) From: Christoph Lameter <clameter@....com> To: Andi Kleen <ak@...e.de> cc: akpm@...ux-foundation.org, travis@....com, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, linux-kernel@...r.kernel.org Subject: Re: [rfc 08/45] cpu alloc: x86 support But one can subtract too... Hmmm... So the cpu area 0 could be put at the beginning of the 2GB kernel area and then grow downwards from 0xffffffff80000000. The cost in terms of code is one subtract instruction for each per_cpu() or CPU_PTR() The next thing doward from 0xffffffff80000000 is the vmemmap at 0xffffe20000000000, so ~32TB. If we leave 16TB for the vmemmap (a 16TB vmmemmap be able to map 2^(44 - 6 + 12) = 2^50 bytes more than currently supported by the processors) then the remaining 16TB could be used to map 1GB per cpu for a 16k config. That is wildly overdoing it. Guess we could just do it with 1M anyways. Just to be safe we could do 128M. 128M x 16k = 2TB? Would such a configuration be okay? - 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/
Powered by blists - more mailing lists