@@ -151,13 +151,6 @@ extern bool mempolicy_in_oom_domain(struct task_struct *tsk,
const nodemask_t *mask);
extern nodemask_t *policy_nodemask(gfp_t gfp, struct mempolicy *policy);
-static inline nodemask_t *policy_nodemask_current(gfp_t gfp)
-{
- struct mempolicy *mpol = get_task_policy(current);
-
- return policy_nodemask(gfp, mpol);
-}
-
extern unsigned int mempolicy_slab_node(void);
extern enum zone_type policy_zone;
@@ -189,6 +182,7 @@ static inline bool mpol_is_preferred_many(struct mempolicy *pol)
return (pol->mode == MPOL_PREFERRED_MANY);
}
+extern bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone);
#else
@@ -294,11 +288,6 @@ static inline void mpol_put_task_policy(struct task_struct *task)
{
}
-static inline nodemask_t *policy_nodemask_current(gfp_t gfp)
-{
- return NULL;
-}
-
static inline bool mpol_is_preferred_many(struct mempolicy *pol)
{
return false;
@@ -4330,18 +4330,34 @@ static int __init default_hugepagesz_setup(char *s)
}
__setup("default_hugepagesz=", default_hugepagesz_setup);
+static nodemask_t *policy_mbind_nodemask(gfp_t gfp)
+{
+#ifdef CONFIG_NUMA
+ struct mempolicy *mpol = get_task_policy(current);
+
+ /*
+ * Only enforce MPOL_BIND policy which overlaps with cpuset policy
+ * (from policy_nodemask) specifically for hugetlb case
+ */
+ if (mpol->mode == MPOL_BIND &&
+ (apply_policy_zone(mpol, gfp_zone(gfp)) &&
+ cpuset_nodemask_valid_mems_allowed(&mpol->nodes)))
+ return &mpol->nodes;
+#endif
+ return NULL;
+}
+
static unsigned int allowed_mems_nr(struct hstate *h)
{
int node;
unsigned int nr = 0;
- nodemask_t *mpol_allowed;
+ nodemask_t *mbind_nodemask;
unsigned int *array = h->free_huge_pages_node;
gfp_t gfp_mask = htlb_alloc_mask(h);
- mpol_allowed = policy_nodemask_current(gfp_mask);
-
+ mbind_nodemask = policy_mbind_nodemask(gfp_mask);
for_each_node_mask(node, cpuset_current_mems_allowed) {
- if (!mpol_allowed || node_isset(node, *mpol_allowed))
+ if (!mbind_nodemask || node_isset(node, *mbind_nodemask))
nr += array[node];
}
@@ -1805,7 +1805,7 @@ bool vma_policy_mof(struct vm_area_struct *vma)
return pol->flags & MPOL_F_MOF;
}
-static int apply_policy_zone(struct mempolicy *policy, enum zone_type zone)
+bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone)
{
enum zone_type dynamic_policy_zone = policy_zone;
Muchun Song found that after MPOL_PREFERRED_MANY policy was introduced in commit b27abaccf8e8 ("mm/mempolicy: add MPOL_PREFERRED_MANY for multiple preferred nodes"), the policy_nodemask_current()'s semantics for this new policy has been changed, which returns 'preferred' nodes instead of 'allowed' nodes. With the changed semantic of policy_nodemask_current, a task with MPOL_PREFERRED_MANY policy could fail to get its reservation even though it can fall back to other nodes (either defined by cpusets or all online nodes) for that reservation failing mmap calles unnecessarily early. The fix is to not consider MPOL_PREFERRED_MANY for reservations at all because they, unlike MPOL_MBIND, do not pose any actual hard constrain. Michal suggested the policy_nodemask_current() is only used by hugetlb, and could be moved to hugetlb code with more explicit name to enforce the 'allowed' semantics for which only MPOL_BIND policy matters. apply_policy_zone() is made extern to be called in hugetlb code and its return value is changed to bool. [1]. https://lore.kernel.org/lkml/20220801084207.39086-1-songmuchun@bytedance.com/t/ Fixes: b27abaccf8e8 ("mm/mempolicy: add MPOL_PREFERRED_MANY for multiple preferred nodes") Reported-by: Muchun Song <songmuchun@bytedance.com> Suggested-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Feng Tang <feng.tang@intel.com> Acked-by: Michal Hocko <mhocko@suse.com> --- Changelog: since v1: * add the missing user visible effect of the problem (Michal Hocko) * add Fix tag (Andrew/Michal) * add Acked-by tag since RFC: * make apply_policy_zone() extern instead of putting it to mempolicy.h (Michal Hocko) include/linux/mempolicy.h | 13 +------------ mm/hugetlb.c | 24 ++++++++++++++++++++---- mm/mempolicy.c | 2 +- 3 files changed, 22 insertions(+), 17 deletions(-)