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xen-devel
[Xen-devel] Re: [RFC PATCH 02/33] Add sync bitops
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To: |
Arjan van de Ven <arjan@xxxxxxxxxxxxx> |
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Subject: |
[Xen-devel] Re: [RFC PATCH 02/33] Add sync bitops |
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From: |
Andi Kleen <ak@xxxxxxx> |
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Date: |
Wed, 19 Jul 2006 14:54:40 +0200 |
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Cc: |
Andrew Morton <akpm@xxxxxxxx>, Zachary Amsden <zach@xxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Pratt <ian.pratt@xxxxxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Chris Wright <chrisw@xxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxx, Christoph Lameter <clameter@xxxxxxx>, Christian Limpach <Christian.Limpach@xxxxxxxxxxxx> |
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Wed, 19 Jul 2006 05:55:55 -0700 |
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On Tuesday 18 July 2006 11:56, Arjan van de Ven wrote:
> On Tue, 2006-07-18 at 00:00 -0700, Chris Wright wrote:
> > plain text document attachment (synch-ops)
> > Add "always lock'd" implementations of set_bit, clear_bit and
> > change_bit and the corresponding test_and_ functions. Also add
> > "always lock'd" implementation of cmpxchg. These give guaranteed
> > strong synchronisation and are required for non-SMP kernels running on
> > an SMP hypervisor.
>
> Hi,
>
> this sounds really like the wrong approach; you know you're compiling
> for xen, so why not just make set_bit() and the others use the lock'd
> instructions at compile time?
I guess because they only need it for a small subset of set_bits.
-Andi
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