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| author |   Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2015-11-10 15:10:33 -0500 |
|---|---|---|
| committer |   David Vrabel <david.vrabel@citrix.com> | 2015-11-26 17:47:35 +0000 |
| commit | 9c17d96500f78d7ecdb71ca6942830158bc75a2b (patch) | |
| tree | 3c263b63881f38914b3725794af61d49486fde25 /drivers | |
| parent | xen: fix the check of e_pfn in xen_find_pfn_range (diff) | |
| download | linux-dev-9c17d96500f78d7ecdb71ca6942830158bc75a2b.tar.xz linux-dev-9c17d96500f78d7ecdb71ca6942830158bc75a2b.zip | |
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')
| -rw-r--r-- | 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 2ea0b3b2a91d..1be5dd048622 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; |