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authorBoris Ostrovsky <boris.ostrovsky@oracle.com>2015-11-10 20:10:33 (GMT)
committerDavid Vrabel <david.vrabel@citrix.com>2015-11-26 17:47:35 (GMT)
commit9c17d96500f78d7ecdb71ca6942830158bc75a2b (patch)
tree3c263b63881f38914b3725794af61d49486fde25 /drivers/xen/gntdev.c
parentabed7d0710e8f892c267932a9492ccf447674fb8 (diff)
downloadlinux-9c17d96500f78d7ecdb71ca6942830158bc75a2b.tar.xz
xen/gntdev: Grant maps should not be subject to NUMA balancing
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 <boris.ostrovsky@oracle.com> Cc: stable@vger.kernel.org Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Diffstat (limited to 'drivers/xen/gntdev.c')
-rw-r--r--drivers/xen/gntdev.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 2ea0b3b..1be5dd0 100644
--- a/drivers/xen/gntdev.c
+++ 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;
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP | VM_IO;
if (use_ptemod)
vma->vm_flags |= VM_DONTCOPY;