diff options
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9efd34f63e81..3abc651bc38a 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -892,8 +892,14 @@ static void task_numa_placement(struct task_struct *p) /* Find the node with the highest number of faults */ for_each_online_node(nid) { - unsigned long faults = p->numa_faults[nid]; + unsigned long faults; + + /* Decay existing window and copy faults since last scan */ p->numa_faults[nid] >>= 1; + p->numa_faults[nid] += p->numa_faults_buffer[nid]; + p->numa_faults_buffer[nid] = 0; + + faults = p->numa_faults[nid]; if (faults > max_faults) { max_faults = faults; max_nid = nid; @@ -919,9 +925,13 @@ void task_numa_fault(int node, int pages, bool migrated) if (unlikely(!p->numa_faults)) { int size = sizeof(*p->numa_faults) * nr_node_ids; - p->numa_faults = kzalloc(size, GFP_KERNEL|__GFP_NOWARN); + /* numa_faults and numa_faults_buffer share the allocation */ + p->numa_faults = kzalloc(size * 2, GFP_KERNEL|__GFP_NOWARN); if (!p->numa_faults) return; + + BUG_ON(p->numa_faults_buffer); + p->numa_faults_buffer = p->numa_faults + nr_node_ids; } /* @@ -939,7 +949,7 @@ void task_numa_fault(int node, int pages, bool migrated) task_numa_placement(p); - p->numa_faults[node] += pages; + p->numa_faults_buffer[node] += pages; } static void reset_ptenuma_scan(struct task_struct *p) |