From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Christoph Lameter <clameter@sgi.com>
Cc: Jeremy Fitzhardinge <jeremy@xensource.com>,
akpm@osdl.org, linux-kernel@vger.kernel.org,
virtualization@lists.osdl.org, xen-devel@lists.xensource.com,
Ian Pratt <ian.pratt@xensource.com>,
Christian Limpach <Christian.Limpach@cl.cam.ac.uk>,
Chris Wright <chrisw@sous-sol.org>
Subject: Re: [patch 2/8] Implement always-locked bit ops, for memory shared with an SMP hypervisor.
Date: Wed, 02 Aug 2006 17:35:56 -0700 [thread overview]
Message-ID: <44D144EC.3000205@goop.org> (raw)
In-Reply-To: <Pine.LNX.4.64.0608021726540.25963@schroedinger.engr.sgi.com>
Christoph Lameter wrote:
> I think I asked this before....
>
> Would it not be simpler to always use the locked implementation on UP? At
> least when the kernel is compiled with hypervisor support? This is going
> to add yet another series of bit operations
You mean make the standard bit-ops atomic on UP when compiling for
CONFIG_PARAVIRT? We think its too much of a burden; there are only a
few operations which must be locked in the hypervisor case, and bit ops
are used everywhere. I'd like to get it to the point where there's no
significant overhead in configuring for PARAVIRT, even if you run on
native hardware.
J
next prev parent reply other threads:[~2006-08-03 0:35 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-03 0:25 [patch 0/8] Basic infrastructure patches for a paravirtualized kernel Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 1/8] Remove locally-defined ldt structure in favour of standard type Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 2/8] Implement always-locked bit ops, for memory shared with an SMP hypervisor Jeremy Fitzhardinge
2006-08-03 0:28 ` Christoph Lameter
2006-08-03 0:35 ` Jeremy Fitzhardinge [this message]
2006-08-03 1:06 ` Christoph Lameter
2006-08-03 1:18 ` Zachary Amsden
2006-08-03 1:25 ` Christoph Lameter
2006-08-03 3:55 ` Andi Kleen
2006-08-03 4:25 ` Christoph Lameter
2006-08-03 4:47 ` Andi Kleen
2006-08-03 2:45 ` Andi Kleen
2006-08-03 4:27 ` Christoph Lameter
2006-08-03 4:49 ` Andi Kleen
2006-08-03 5:19 ` Christoph Lameter
2006-08-03 5:25 ` Andi Kleen
2006-08-03 5:32 ` Christoph Lameter
2006-08-03 5:39 ` Andi Kleen
2006-08-03 5:54 ` Christoph Lameter
2006-08-03 6:02 ` Andi Kleen
2006-08-03 16:49 ` Christoph Lameter
2006-08-03 17:18 ` Chris Wright
2006-08-04 0:47 ` Andi Kleen
2006-08-04 2:16 ` Christoph Lameter
2006-08-03 0:25 ` [patch 3/8] Allow a kernel to not be in ring 0 Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 4/8] Replace sensitive instructions with macros Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 5/8] Roll all the cpuid asm into one __cpuid call Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 6/8] Make __FIXADDR_TOP variable to allow it to make space for a hypervisor Jeremy Fitzhardinge
2006-08-03 0:25 ` [patch 7/8] Add a bootparameter to reserve high linear address space Jeremy Fitzhardinge
1970-01-01 0:15 ` Pavel Machek
2006-08-07 2:10 ` Andi Kleen
2010-05-04 23:37 ` Jeremy Fitzhardinge
2006-08-03 6:19 ` Andrew Morton
2006-08-03 7:33 ` Zachary Amsden
2006-08-03 7:41 ` Andrew Morton
2006-08-03 8:58 ` Zachary Amsden
2006-08-05 21:58 ` Andrew Morton
2006-08-05 22:52 ` Zachary Amsden
2006-08-05 23:17 ` Rusty Russell
2006-08-03 0:25 ` [patch 8/8] Put .note.* sections into a PT_NOTE segment in vmlinux Jeremy Fitzhardinge
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