Rename the policy to reflect that while allocations and migrations are
based on reference that the home node is taken into account for
migration decisions.
Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
---
include/uapi/linux/mempolicy.h | 9 ++++++++-
mm/mempolicy.c | 9 ++++++---
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/include/uapi/linux/mempolicy.h b/include/uapi/linux/mempolicy.h
index 0d11c3d..4506772 100644
--- a/include/uapi/linux/mempolicy.h
+++ b/include/uapi/linux/mempolicy.h
@@ -67,7 +67,14 @@ enum mpol_rebind_step {
#define MPOL_F_LOCAL (1 << 1) /* preferred local allocation */
#define MPOL_F_REBINDING (1 << 2) /* identify policies in rebinding */
#define MPOL_F_MOF (1 << 3) /* this policy wants migrate on fault */
-#define MPOL_F_MORON (1 << 4) /* Migrate On pte_numa Reference On Node */
+#define MPOL_F_HOME (1 << 4) /*
+ * Migrate towards referencing node.
+ * By building up stats on faults, the
+ * scheduler will reinforce the choice
+ * by identifying a home node and
+ * queueing the task on that node
+ * where possible.
+ */
#endif /* _UAPI_LINUX_MEMPOLICY_H */
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index fd20e28..3da7435 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2316,8 +2316,11 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long
BUG();
}
- /* Migrate the page towards the node whose CPU is referencing it */
- if (pol->flags & MPOL_F_MORON) {
+ /*
+ * Migrate pages towards their referencing node. Based on the fault
+ * statistics a home node will be chosen by the scheduler
+ */
+ if (pol->flags & MPOL_F_HOME) {
int last_nid;
polnid = numa_node_id();
@@ -2540,7 +2543,7 @@ void __init numa_policy_init(void)
preferred_node_policy[nid] = (struct mempolicy) {
.refcnt = ATOMIC_INIT(1),
.mode = MPOL_PREFERRED,
- .flags = MPOL_F_MOF | MPOL_F_MORON,
+ .flags = MPOL_F_MOF | MPOL_F_HOME,
.v = { .preferred_node = nid, },
};
}
--
1.7.9.2
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