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-rw-r--r--include/linux/mempolicy.h12
-rw-r--r--kernel/cpuset.c2
-rw-r--r--mm/mempolicy.c31
3 files changed, 30 insertions, 15 deletions
diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 05fddd5..74357cb 100644
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -68,6 +68,7 @@ struct mempolicy {
nodemask_t nodes; /* interleave */
/* undefined for default */
} v;
+ nodemask_t cpuset_mems_allowed; /* mempolicy relative to these nodes */
};
/*
@@ -146,7 +147,9 @@ struct mempolicy *mpol_shared_policy_lookup(struct shared_policy *sp,
extern void numa_default_policy(void);
extern void numa_policy_init(void);
-extern void numa_policy_rebind(const nodemask_t *old, const nodemask_t *new);
+extern void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *new);
+extern void mpol_rebind_task(struct task_struct *tsk,
+ const nodemask_t *new);
extern struct mempolicy default_policy;
extern struct zonelist *huge_zonelist(struct vm_area_struct *vma,
unsigned long addr);
@@ -221,7 +224,12 @@ static inline void numa_default_policy(void)
{
}
-static inline void numa_policy_rebind(const nodemask_t *old,
+static inline void mpol_rebind_policy(struct mempolicy *pol,
+ const nodemask_t *new)
+{
+}
+
+static inline void mpol_rebind_task(struct task_struct *tsk,
const nodemask_t *new)
{
}
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 0d0dbbd..8f764de 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -643,7 +643,7 @@ void cpuset_update_task_memory_state()
tsk->cpuset_mems_generation = cs->mems_generation;
task_unlock(tsk);
up(&callback_sem);
- numa_policy_rebind(&oldmem, &tsk->mems_allowed);
+ mpol_rebind_task(tsk, &tsk->mems_allowed);
if (!nodes_equal(oldmem, tsk->mems_allowed)) {
if (migrate) {
do_migrate_pages(tsk->mm, &oldmem,
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 34d566a..c39bd86 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -180,6 +180,7 @@ static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
break;
}
policy->policy = mode;
+ policy->cpuset_mems_allowed = cpuset_mems_allowed(current);
return policy;
}
@@ -1411,25 +1412,31 @@ void numa_default_policy(void)
}
/* Migrate a policy to a different set of nodes */
-static void rebind_policy(struct mempolicy *pol, const nodemask_t *old,
- const nodemask_t *new)
+void mpol_rebind_policy(struct mempolicy *pol, const nodemask_t *newmask)
{
+ nodemask_t *mpolmask;
nodemask_t tmp;
if (!pol)
return;
+ mpolmask = &pol->cpuset_mems_allowed;
+ if (nodes_equal(*mpolmask, *newmask))
+ return;
switch (pol->policy) {
case MPOL_DEFAULT:
break;
case MPOL_INTERLEAVE:
- nodes_remap(tmp, pol->v.nodes, *old, *new);
+ nodes_remap(tmp, pol->v.nodes, *mpolmask, *newmask);
pol->v.nodes = tmp;
- current->il_next = node_remap(current->il_next, *old, *new);
+ *mpolmask = *newmask;
+ current->il_next = node_remap(current->il_next,
+ *mpolmask, *newmask);
break;
case MPOL_PREFERRED:
pol->v.preferred_node = node_remap(pol->v.preferred_node,
- *old, *new);
+ *mpolmask, *newmask);
+ *mpolmask = *newmask;
break;
case MPOL_BIND: {
nodemask_t nodes;
@@ -1439,7 +1446,7 @@ static void rebind_policy(struct mempolicy *pol, const nodemask_t *old,
nodes_clear(nodes);
for (z = pol->v.zonelist->zones; *z; z++)
node_set((*z)->zone_pgdat->node_id, nodes);
- nodes_remap(tmp, nodes, *old, *new);
+ nodes_remap(tmp, nodes, *mpolmask, *newmask);
nodes = tmp;
zonelist = bind_zonelist(&nodes);
@@ -1454,6 +1461,7 @@ static void rebind_policy(struct mempolicy *pol, const nodemask_t *old,
kfree(pol->v.zonelist);
pol->v.zonelist = zonelist;
}
+ *mpolmask = *newmask;
break;
}
default:
@@ -1463,14 +1471,13 @@ static void rebind_policy(struct mempolicy *pol, const nodemask_t *old,
}
/*
- * Someone moved this task to different nodes. Fixup mempolicies.
- *
- * TODO - fixup current->mm->vma and shmfs/tmpfs/hugetlbfs policies as well,
- * once we have a cpuset mechanism to mark which cpuset subtree is migrating.
+ * Wrapper for mpol_rebind_policy() that just requires task
+ * pointer, and updates task mempolicy.
*/
-void numa_policy_rebind(const nodemask_t *old, const nodemask_t *new)
+
+void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new)
{
- rebind_policy(current->mempolicy, old, new);
+ mpol_rebind_policy(tsk->mempolicy, new);
}
/*
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