sched: Set preferred NUMA node based on number of private faults

["Figo.zhang" <figo1802@xxxxxxxxx>]

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4baf12e..8e2a364 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c

@@ -2292,9 +2292,11 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long

/* Migrate the page towards the node whose CPU is referencing it */

if (pol->flags & MPOL_F_MORON) {

- int last_nid;

+ int last_nidpid;

+ int this_nidpid;

polnid = numa_node_id();

+ this_nidpid = nid_pid_to_nidpid(polnid, current->pid);

/*

* Multi-stage node selection is used in conjunction

@@ -2317,8 +2319,8 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long

* it less likely we act on an unlikely task<->page

* relation.

*/

- last_nid = page_nid_xchg_last(page, polnid);

- if (last_nid != polnid)

+ last_nidpid = page_nidpid_xchg_last(page, this_nidpid);

+ if (!nidpid_pid_unset(last_nidpid) && nidpid_to_nid(last_nidpid) != polnid)

=>if the page is the first access, so nidpid_pid_unset(last_nidpid) return true, so we should not check and migrate the first access page if curnid != polnid.

- last_nid = page_nid_xchg_last(page, polnid);

- if (last_nid != polnid)

+ last_nidpid = page_nidpid_xchg_last(page, this_nidpid);

+ if (nidpid_pid_unset(last_nidpid))

+ goto out;

+ else if (nidpid_to_nid(last_nidpid) != polnid)