From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aserp1040.oracle.com ([141.146.126.69]:45771 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751031AbbKJUJe (ORCPT ); Tue, 10 Nov 2015 15:09:34 -0500 From: Boris Ostrovsky To: konrad.wilk@oracle.com, david.vrabel@citrix.com Cc: xen-devel@lists.xen.org, linux-kernel@vger.kernel.org, boris.ostrovsky@oracle.com, stable@vger.kernel.org Subject: [PATCH RESEND] xen/gntdev: Grant maps should not be subject to NUMA balancing Date: Tue, 10 Nov 2015 15:10:33 -0500 Message-Id: <1447186233-3194-1-git-send-email-boris.ostrovsky@oracle.com> Sender: stable-owner@vger.kernel.org List-ID: 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 Cc: stable@vger.kernel.org --- - Added stable@vger.kernel.org drivers/xen/gntdev.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 67b9163..bf312df 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -802,7 +802,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) 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; -- 1.7.1