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| Started by | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| First post | 2016-01-06 11:50 +0100 |
| Last post | 2016-01-06 11:50 +0100 |
| Articles | 1 — 1 participant |
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[PATCH 3.16.y-ckt 079/126] xen/gntdev: Grant maps should not be subject to NUMA balancing Luis Henriques <luis.henriques@canonical.com> - 2016-01-06 11:50 +0100
| From | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| Date | 2016-01-06 11:50 +0100 |
| Subject | [PATCH 3.16.y-ckt 079/126] xen/gntdev: Grant maps should not be subject to NUMA balancing |
| Message-ID | <qNTPe-8o8-59@gated-at.bofh.it> |
3.16.7-ckt22 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Boris Ostrovsky <boris.ostrovsky@oracle.com> commit 9c17d96500f78d7ecdb71ca6942830158bc75a2b upstream. 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> Signed-off-by: David Vrabel <david.vrabel@citrix.com> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/xen/gntdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index 91cc44611062..7ffbb9390628 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -765,7 +765,7 @@ 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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