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xen-devel
Re: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks
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To: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Subject: |
Re: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks |
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From: |
Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
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Date: |
Wed, 5 Oct 2005 23:02:31 +0100 |
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Cc: |
"Koren, Bradley J" <Bradley.Koren@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx>, "Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx> |
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Wed, 05 Oct 2005 22:07:57 +0000 |
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On 5 Oct 2005, at 22:46, Keir Fraser wrote:
Does anyone know if there are other places where the "lock" prefix is
used with a cache misaligned address?
x86 systems are supposed to guarantee that LOCKed instructions access
their memory operand atomically, regardless of alignment (Vol 3 of the
Intel reference manual). Your systems break this application-visible
guarantee?
Also, the patch is way bigger and more invasive than it needs to be.
There should be no need to make pfn_info bigger than it is. It's
currently a multiple of 8 bytes (e.g., 24 bytes on 32-bit) which is
sufficient to avoid cache-line crossing of aligned 8-byte quantities.
What if we just move 'tlbflush_timestamp' to the end of the structure?
A one-line fix? :-)
-- Keir
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- [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Ian Pratt
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Nakajima, Jun
- RE: [Xen-devel] [PATCH] "lock cmpxch8b" and split locks, Puthiyaparambil, Aravindh
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