From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:37768 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752194AbcAXXRR (ORCPT ); Sun, 24 Jan 2016 18:17:17 -0500 Subject: Patch "xen/gntdev: Grant maps should not be subject to NUMA balancing" has been added to the 4.1-stable tree To: boris.ostrovsky@oracle.com, david.vrabel@citrix.com, gregkh@linuxfoundation.org Cc: , From: Date: Sun, 24 Jan 2016 15:17:16 -0800 Message-ID: <145367743627201@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled xen/gntdev: Grant maps should not be subject to NUMA balancing to the 4.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xen-gntdev-grant-maps-should-not-be-subject-to-numa-balancing.patch and it can be found in the queue-4.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 9c17d96500f78d7ecdb71ca6942830158bc75a2b Mon Sep 17 00:00:00 2001 From: Boris Ostrovsky Date: Tue, 10 Nov 2015 15:10:33 -0500 Subject: xen/gntdev: Grant maps should not be subject to NUMA balancing From: Boris Ostrovsky commit 9c17d96500f78d7ecdb71ca6942830158bc75a2b upstream. Doing so will cause the grant to be unmapped and then, during fault handling, the fault to be mistakenly treated as NUMA hint fault. In addition, even if those maps could partcipate in NUMA balancing, it wouldn't provide any benefit since we are unable to determine physical page's node (even if/when VNUMA is implemented). Marking grant maps' VMAs as VM_IO will exclude them from being part of NUMA balancing. Signed-off-by: Boris Ostrovsky Signed-off-by: David Vrabel Signed-off-by: Greg Kroah-Hartman --- drivers/xen/gntdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -804,7 +804,7 @@ static int gntdev_mmap(struct file *flip vma->vm_ops = &gntdev_vmops; - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO; if (use_ptemod) vma->vm_flags |= VM_DONTCOPY; Patches currently in stable-queue which might be from boris.ostrovsky@oracle.com are queue-4.1/x86-xen-don-t-reset-vcpu_info-on-a-cancelled-suspend.patch queue-4.1/xen-gntdev-grant-maps-should-not-be-subject-to-numa-balancing.patch