Auto NUMA does migratability check on any given VMA before scanning it for
marking purpose. For now if the coherent device memory has been faulted in
or migrated into a process VMA, it should not be part of the auto NUMA
migration scheme. The check is based on VM_CDM flag.
Signed-off-by: Anshuman Khandual <khand...@linux.vnet.ibm.com>
---
include/linux/mempolicy.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 5e5b296..09d4b70 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -171,9 +171,26 @@ extern int mpol_parse_str(char *str, struct mempolicy
**mpol);
extern void mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
+#ifdef CONFIG_COHERENT_DEVICE
+static bool is_cdm_vma(struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_CDM)
+ return true;
+ return false;
+}
+#else
+static bool is_cdm_vma(struct vm_area_struct *vma)
+{
+ return false;
+}
+#endif
+
/* Check if a vma is migratable */
static inline bool vma_migratable(struct vm_area_struct *vma)
{
+ if (is_cdm_vma(vma))
+ return false;
+
if (vma->vm_flags & (VM_IO | VM_PFNMAP))
return false;
--
2.1.0
