 Home |
Products |
Support |
Community |
News |
xen-devel
[Xen-devel] [PATCH] Avoid possible live-lock in vcpu_migrate
| To: | xen-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-devel] [PATCH] Avoid possible live-lock in vcpu_migrate |
| From: | Juergen Gross <juergen.gross@xxxxxxxxxxxxxx> |
| Date: | Mon, 28 Feb 2011 10:23:02 +0100 |
| Delivery-date: | Mon, 28 Feb 2011 01:25:51 -0800 |
| Dkim-signature: | v=1; a=rsa-sha256; c=simple/simple; d=ts.fujitsu.com; i=juergen.gross@xxxxxxxxxxxxxx; q=dns/txt; s=s1536b; t=1298885110; x=1330421110; h=mime-version:subject:message-id:date:from:to; bh=NoR5sCI5YmfJ3rtnZbrn9IlTplRlSdGsxT2rIvkja8k=; b=hnWdW45IfQt+ohpgjzAfvIkQgW4Z99Xas0zlyU88ninchX6iIo1dtVc7 5UaXIYEcE8GcXnhHRny1Sqd5lPXD8WijS0ZxhJdjk2+4enVqssVy/i6U3 nN7NLezstpXVVZd1DIJd5LjkoMrD+umMZ+eMAq1gTJ+XZlri615OuBb2Z Ps4f09v2qmlUCVz9zxwBne2/0rSw21vOyyCmQT6klpbKwiukibXUVnk9T re+ns3ZBQHQ4EtNfWgaInSClXVQve; |
| Domainkey-signature: | s=s1536a; d=ts.fujitsu.com; c=nofws; q=dns; h=X-SBRSScore:X-IronPort-AV:Received:X-IronPort-AV: Received:Received:Content-Type:MIME-Version:Subject: X-Mercurial-Node:Message-Id:Date:From:To; b=FHXtzAOZ/OIxcDl2j+wutWG5Abj3mY2e53ijSbcv7AdyAzP1pwLn/AxF srLjjdMfCUBP5y6eMJ7h7KPfttexJ3MdOYuqhtNCYzSodC+zbH6l6C2Hp uIqB4fEADCF3iRV54u8ybM0XlkTXpC8M6WVYd/j1QbWp6kuoh/hrSnTpF Qo2I59RG1OnwchZLvqs380ofXCW/61UCAYI7QcQkkYbdxHu4SnoJyZZl5 g5WSwMBLgSWwWWDhLSCtYXKssCtQd; |
| 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 |
If vcpu_migrate is called for two vcpus active on different cpus resulting in swapping the cpus, a live-lock could occur as both instances try to take the scheduling lock of the physical cpus in opposite order. To avoid this problem the locks are always taken in the same order (sorted by the address of the lock). Signed-off-by: juergen.gross@xxxxxxxxxxxxxx 1 file changed, 43 insertions(+), 27 deletions(-) xen/common/schedule.c | 70 ++++++++++++++++++++++++++++++-------------------
_______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: [Xen-devel] [PATCH] libxc: fix incorrect scanning of pfn array in pagebuf during migration, Ian Campbell |
|---|---|
| Next by Date: | Re: [Xen-devel] [PATCH] Avoid race when moving cpu between cpupools, Juergen Gross |
| Previous by Thread: | [Xen-devel] XEN event channel (interdomain communication), Sankaran Sivathanu |
| Next by Thread: | [Xen-devel] xen-netfront does not properly transmit forwarded packets, Rafal Wojtczuk |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
