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Date: Thu, 10 Nov 2016 13:09:59 -0500 From: Boris Ostrovsky <boris.ostrovsky@...cle.com> To: David Vrabel <david.vrabel@...rix.com>, Olaf Hering <olaf@...fle.de> Cc: konrad.wilk@...cle.com, linux-kernel@...r.kernel.org, stable@...r.kernel.org, xen-devel@...ts.xen.org Subject: Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not be subject to NUMA balancing On 11/10/2016 12:49 PM, David Vrabel wrote: > On 10/11/16 17:47, Olaf Hering wrote: >> On Thu, Nov 10, Boris Ostrovsky wrote: >> >>> Are you sure it's this patch that causes the failure? >>> >>> I commented out '| VM_IO' and still unable to boot with this option. >> Yes, this works for me, sles12sp2 dom0+domU, which is linux-4.4 based: I've never tested on 4.4, this was added for 4.5 (with CC to stable#4.4) and now I am testing on 4.7) >> >> +++ b/drivers/xen/gntdev.c >> @@ -804,7 +804,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) >> >> vma->vm_ops = &gntdev_vmops; >> >> - vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO; >> + vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP /*| VM_IO*/; >> >> if (use_ptemod) >> vma->vm_flags |= VM_DONTCOPY; > I think we need a custom policy for this VMA with MPOL_F_MOF cleared. I think you are right, I remember when I was looking at this adding a policy was the other option. Let me look at this again. -boris
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