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-rw-r--r--mm/mempolicy.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index c39bd86..1850d0a 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1131,6 +1131,15 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
}
EXPORT_SYMBOL(alloc_pages_current);
+/*
+ * If mpol_copy() sees current->cpuset == cpuset_being_rebound, then it
+ * rebinds the mempolicy its copying by calling mpol_rebind_policy()
+ * with the mems_allowed returned by cpuset_mems_allowed(). This
+ * keeps mempolicies cpuset relative after its cpuset moves. See
+ * further kernel/cpuset.c update_nodemask().
+ */
+void *cpuset_being_rebound;
+
/* Slow path of a mempolicy copy */
struct mempolicy *__mpol_copy(struct mempolicy *old)
{
@@ -1138,6 +1147,10 @@ struct mempolicy *__mpol_copy(struct mempolicy *old)
if (!new)
return ERR_PTR(-ENOMEM);
+ if (current_cpuset_is_being_rebound()) {
+ nodemask_t mems = cpuset_mems_allowed(current);
+ mpol_rebind_policy(old, &mems);
+ }
*new = *old;
atomic_set(&new->refcnt, 1);
if (new->policy == MPOL_BIND) {
@@ -1481,6 +1494,22 @@ void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new)
}
/*
+ * Rebind each vma in mm to new nodemask.
+ *
+ * Call holding a reference to mm. Takes mm->mmap_sem during call.
+ */
+
+void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
+{
+ struct vm_area_struct *vma;
+
+ down_write(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next)
+ mpol_rebind_policy(vma->vm_policy, new);
+ up_write(&mm->mmap_sem);
+}
+
+/*
* Display pages allocated per node and memory policy via /proc.
*/
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