Kernel cannot track device memory accesses behind VMAs containing CDM
memory. Hence all the VM_CDM marked VMAs should not be part of the auto
NUMA migration scheme. This patch also adds a new function is_cdm_vma()
to detect any VMA marked with flag VM_CDM.
Signed-off-by: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
---
include/linux/mempolicy.h | 14 ++++++++++++++
kernel/sched/fair.c | 3 ++-
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 5f4d828..ff0c6bc 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -172,6 +172,20 @@ 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 inline bool is_cdm_vma(struct vm_area_struct *vma)
+{
+ if (vma->vm_flags & VM_CDM)
+ return true;
+ return false;
+}
+#else
+static inline 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)
{
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6559d19..523508c 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2482,7 +2482,8 @@ void task_numa_work(struct callback_head *work)
}
for (; vma; vma = vma->vm_next) {
if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
- is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
+ is_vm_hugetlb_page(vma) || is_cdm_vma(vma) ||
+ (vma->vm_flags & VM_MIXEDMAP)) {
continue;
}
--
2.9.3
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