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xen-devel
[Xen-devel] [PATCH] "lock cmpxch8b" and split locks
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Subject: |
[Xen-devel] [PATCH] "lock cmpxch8b" and split locks |
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From: |
"Puthiyaparambil, Aravindh" <aravindh.puthiyaparambil@xxxxxxxxxx> |
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Date: |
Wed, 5 Oct 2005 14:27:35 -0400 |
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Cc: |
"Koren, Bradley J" <Bradley.Koren@xxxxxxxxxx>, "Subrahmanian, Raj" <raj.subrahmanian@xxxxxxxxxx>, "Vessey, Bruce A" <Bruce.Vessey@xxxxxxxxxx> |
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Wed, 05 Oct 2005 18:25:11 +0000 |
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[PATCH] "lock cmpxch8b" and split locks |
I have been looking at the following bug
http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=252
That investigation is still underway.
While looking at this problem I found that in "lock cmpxch8b
&page->count_info" occurring in "get_page( )", "&page->count_info" is on
a misaligned address. Furthermore the address of "page" is not modulo
64. So the "lock cmpxch8b" can happen across cache lines and lead to a
split lock. On systems which have multiple buses, the atomicity of such
a statement is not assured and can cause synchronization problems.
I have attached a patch which solves this issue.
Does anyone know if there are other places where the "lock" prefix is
used with a cache misaligned address?
Signed off by Aravindh Puthiyaparambil
<aravindh.puthiyaparambil@xxxxxxxxxx>
mm.patch
Description: mm.patch
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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
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