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Date: Thu, 10 Jul 2008 13:51:29 -0400 From: "H. Peter Anvin" <hpa@...or.com> To: "Eric W. Biederman" <ebiederm@...ssion.com> CC: Christoph Lameter <cl@...ux-foundation.org>, Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>, Mike Travis <travis@....com>, Andrew Morton <akpm@...ux-foundation.org>, Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org, Arjan van de Ven <arjan@...radead.org> Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses Eric W. Biederman wrote: > Christoph Lameter <cl@...ux-foundation.org> writes: > >> H. Peter Anvin wrote: >> >>> but there is a distinct lack of wiggle room, which can be resolved >>> either by using negative offsets, or by moving the kernel text area up a >>> bit from -2 GB. >> Lets say we reserve 256MB of cpu alloc space per processor. > > First off right now reserving more than about 64KB is ridiculous. We rightly > don't have that many per cpu variables. Almost half a megabyte in current allyesconfig, and that is not including dynamic allocations at all. -hpa -- 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/
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