linux-kernel - Re: [Xen-devel] [PATCH RESEND] xen/gntdev: Grant maps should not be subject to NUMA balancing

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Message-ID: <9c5d23e9-cb02-5f83-0422-2bbf55fb7779@citrix.com>
Date:   Thu, 10 Nov 2016 17:49:21 +0000
From:   David Vrabel <david.vrabel@...rix.com>
To:     Olaf Hering <olaf@...fle.de>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
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 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:
> 
> +++ 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.

David