This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] [PATCH][RFC] FPU LWP 0/5: patch description

To: "'xen-devel@xxxxxxxxxxxxxxxxxxx'" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] [PATCH][RFC] FPU LWP 0/5: patch description
From: Wei Huang <wei.huang2@xxxxxxx>
Date: Thu, 14 Apr 2011 15:37:27 -0500
Delivery-date: Thu, 14 Apr 2011 13:41:54 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686 (x86_64); en-US; rv: Gecko/20110303 Thunderbird/3.1.9
The following patches support AMD lightweight profiling.

Because LWP isn't tracked by CR0.TS bit, we clean up the FPU code to handle lazy and unlazy FPU states differently. Lazy FPU state (such as SSE, YMM) is handled when #NM is triggered. Unlazy state, such as LWP, is saved and restored on each vcpu context switch. To simplify the code, we also add a mask option to xsave/xrstor function.


Xen-devel mailing list