diff options
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 516491fbfaa..4c1c8d83ac6 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -118,6 +118,26 @@ static struct mempolicy default_policy = { .flags = MPOL_F_LOCAL, }; +static struct mempolicy preferred_node_policy[MAX_NUMNODES]; + +static struct mempolicy *get_task_policy(struct task_struct *p) +{ + struct mempolicy *pol = p->mempolicy; + int node; + + if (!pol) { + node = numa_node_id(); + if (node != -1) + pol = &preferred_node_policy[node]; + + /* preferred_node_policy is not initialised early in boot */ + if (!pol->mode) + pol = NULL; + } + + return pol; +} + static const struct mempolicy_operations { int (*create)(struct mempolicy *pol, const nodemask_t *nodes); /* @@ -1598,7 +1618,7 @@ asmlinkage long compat_sys_mbind(compat_ulong_t start, compat_ulong_t len, struct mempolicy *get_vma_policy(struct task_struct *task, struct vm_area_struct *vma, unsigned long addr) { - struct mempolicy *pol = task->mempolicy; + struct mempolicy *pol = get_task_policy(task); if (vma) { if (vma->vm_ops && vma->vm_ops->get_policy) { @@ -2021,7 +2041,7 @@ retry_cpuset: */ struct page *alloc_pages_current(gfp_t gfp, unsigned order) { - struct mempolicy *pol = current->mempolicy; + struct mempolicy *pol = get_task_policy(current); struct page *page; unsigned int cpuset_mems_cookie; @@ -2295,6 +2315,11 @@ int mpol_misplaced(struct page *page, struct vm_area_struct *vma, unsigned long default: BUG(); } + + /* Migrate the page towards the node whose CPU is referencing it */ + if (pol->flags & MPOL_F_MORON) + polnid = numa_node_id(); + if (curnid != polnid) ret = polnid; out: @@ -2483,6 +2508,15 @@ void __init numa_policy_init(void) sizeof(struct sp_node), 0, SLAB_PANIC, NULL); + for_each_node(nid) { + preferred_node_policy[nid] = (struct mempolicy) { + .refcnt = ATOMIC_INIT(1), + .mode = MPOL_PREFERRED, + .flags = MPOL_F_MOF | MPOL_F_MORON, + .v = { .preferred_node = nid, }, + }; + } + /* * Set interleaving policy for system init. Interleaving is only * enabled across suitably sized nodes (default is >= 16MB), or |