If a page monitored by ANB is migrated, its footprint should be erased from
numa-hint-fault account, because it is no longer used. Or two pages, the
migrated page and its target page, are used in the view of task placement.
Signed-off-by: Hillf Danton <dhillf@xxxxxxxxx>
---
--- a/kernel/sched/fair.c Wed Sep 11 18:33:00 2013
+++ b/kernel/sched/fair.c Fri Sep 13 08:24:24 2013
@@ -1560,6 +1560,20 @@ void task_numa_fault(int last_cpupid, in
p->numa_pages_migrated += pages;
p->numa_faults_buffer[task_faults_idx(node, priv)] += pages;
+
+ if (migrated && last_cpupid != (-1 & LAST_CPUPID_MASK)) {
+ /* Erase footprint of migrated page */
+ int idx;
+
+ idx = cpupid_to_cpu(last_cpupid);
+ idx = cpu_to_node(idx);
+ idx = task_faults_idx(idx, priv);
+
+ if (p->numa_faults_buffer[idx] >= pages)
+ p->numa_faults_buffer[idx] -= pages;
+ else if (p->numa_faults_buffer[idx])
+ p->numa_faults_buffer[idx] = 0;
+ }
}
static void reset_ptenuma_scan(struct task_struct *p)
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