mm/hugetlb: add dedicated func to get 'allowed' nodemask for current process

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/

Link: https://lkml.kernel.org/r/20220805005903.95563-1-feng.tang@intel.com
Fixes: b27abaccf8e8 ("mm/mempolicy: add MPOL_PREFERRED_MANY for multiple preferred nodes")
Signed-off-by: Feng Tang <feng.tang@intel.com>
Reported-by: Muchun Song <songmuchun@bytedance.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Ben Widawsky <bwidawsk@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/mempolicy.h b/include/linux/mempolicy.h
index 668389b4b53d7a9cf58c239a37583714adbdbac9..d232de7cdc569f88adb5e2fe5d978fcaa68b2cc2 100644 (file)
--- a/include/linux/mempolicy.h
+++ b/include/linux/mempolicy.h
@@ -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;

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index e070b8593b3765c998bc4d742afc862a1d42adaf..ea1c7bfa1cc36eeb7653790769438056acce60de 100644 (file)
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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];
        }
 

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index ff6a88114bb851af532661511839b33aec964a1e..a88fd94e18d6f36490175f2b72627a5c173f5538 100644 (file)
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -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;