mm: optimize put_mems_allowed() usage

Since put_mems_allowed() is strictly optional, its a seqcount retry, we
don't need to evaluate the function if the allocation was in fact
successful, saving a smp_rmb some loads and comparisons on some relative
fast-paths.

Since the naming, get/put_mems_allowed() does suggest a mandatory
pairing, rename the interface, as suggested by Mel, to resemble the
seqcount interface.

This gives us: read_mems_allowed_begin() and read_mems_allowed_retry(),
where it is important to note that the return value of the latter call
is inverted from its previous incarnation.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 38 insertions, 39 deletions

diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
index 3fe661fe96d1..b19d3dc2e651 100644
--- a/include/linux/cpuset.h
+++ b/include/linux/cpuset.h
@@ -87,25 +87,26 @@ extern void rebuild_sched_domains(void);
 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
 
 /*
- * get_mems_allowed is required when making decisions involving mems_allowed
- * such as during page allocation. mems_allowed can be updated in parallel
- * and depending on the new value an operation can fail potentially causing
- * process failure. A retry loop with get_mems_allowed and put_mems_allowed
- * prevents these artificial failures.
+ * read_mems_allowed_begin is required when making decisions involving
+ * mems_allowed such as during page allocation. mems_allowed can be updated in
+ * parallel and depending on the new value an operation can fail potentially
+ * causing process failure. A retry loop with read_mems_allowed_begin and
+ * read_mems_allowed_retry prevents these artificial failures.
  */
-static inline unsigned int get_mems_allowed(void)
+static inline unsigned int read_mems_allowed_begin(void)
 {
         return read_seqcount_begin(&current->mems_allowed_seq);
 }
 
 /*
- * If this returns false, the operation that took place after get_mems_allowed
- * may have failed. It is up to the caller to retry the operation if
+ * If this returns true, the operation that took place after
+ * read_mems_allowed_begin may have failed artificially due to a concurrent
+ * update of mems_allowed. It is up to the caller to retry the operation if
  * appropriate.
  */
-static inline bool put_mems_allowed(unsigned int seq)
+static inline bool read_mems_allowed_retry(unsigned int seq)
 {
-        return !read_seqcount_retry(&current->mems_allowed_seq, seq);
+        return read_seqcount_retry(&current->mems_allowed_seq, seq);
 }
 
 static inline void set_mems_allowed(nodemask_t nodemask)
@@ -225,14 +226,14 @@ static inline void set_mems_allowed(nodemask_t nodemask)
 {
 }
 
-static inline unsigned int get_mems_allowed(void)
+static inline unsigned int read_mems_allowed_begin(void)
 {
         return 0;
 }
 
-static inline bool put_mems_allowed(unsigned int seq)
+static inline bool read_mems_allowed_retry(unsigned int seq)
 {
-        return true;
+        return false;
 }
 
 #endif /* !CONFIG_CPUSETS */
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index e6b1b66afe52..f6fc7475f1a1 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1022,7 +1022,7 @@ static void cpuset_change_task_nodemask(struct task_struct *tsk,
         task_lock(tsk);
         /*
          * Determine if a loop is necessary if another thread is doing
-         * get_mems_allowed().  If at least one node remains unchanged and
+         * read_mems_allowed_begin().  If at least one node remains unchanged and
          * tsk does not have a mempolicy, then an empty nodemask will not be
          * possible when mems_allowed is larger than a word.
          */
diff --git a/mm/filemap.c b/mm/filemap.c
index 7a13f6ac5421..068cd2a63d32 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -520,10 +520,10 @@ struct page *__page_cache_alloc(gfp_t gfp)
         if (cpuset_do_page_mem_spread()) {
                 unsigned int cpuset_mems_cookie;
                 do {
-                        cpuset_mems_cookie = get_mems_allowed();
+                        cpuset_mems_cookie = read_mems_allowed_begin();
                         n = cpuset_mem_spread_node();
                         page = alloc_pages_exact_node(n, gfp, 0);
-                } while (!put_mems_allowed(cpuset_mems_cookie) && !page);
+                } while (!page && read_mems_allowed_retry(cpuset_mems_cookie));
 
                 return page;
         }
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c01cb9fedb18..139b7462203b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -540,7 +540,7 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
                 goto err;
 
 retry_cpuset:
-        cpuset_mems_cookie = get_mems_allowed();
+        cpuset_mems_cookie = read_mems_allowed_begin();
         zonelist = huge_zonelist(vma, address,
                                         htlb_alloc_mask(h), &mpol, &nodemask);
 
@@ -562,7 +562,7 @@ retry_cpuset:
         }
 
         mpol_cond_put(mpol);
-        if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+        if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
                 goto retry_cpuset;
         return page;
 
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 4755c8576942..e3ab02822799 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1899,7 +1899,7 @@ int node_random(const nodemask_t *maskp)
  * If the effective policy is 'BIND, returns a pointer to the mempolicy's
  * @nodemask for filtering the zonelist.
  *
- * Must be protected by get_mems_allowed()
+ * Must be protected by read_mems_allowed_begin()
  */
 struct zonelist *huge_zonelist(struct vm_area_struct *vma, unsigned long addr,
                                 gfp_t gfp_flags, struct mempolicy **mpol,
@@ -2063,7 +2063,7 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
 
 retry_cpuset:
         pol = get_vma_policy(current, vma, addr);
-        cpuset_mems_cookie = get_mems_allowed();
+        cpuset_mems_cookie = read_mems_allowed_begin();
 
         if (unlikely(pol->mode == MPOL_INTERLEAVE)) {
                 unsigned nid;
@@ -2071,7 +2071,7 @@ retry_cpuset:
                 nid = interleave_nid(pol, vma, addr, PAGE_SHIFT + order);
                 mpol_cond_put(pol);
                 page = alloc_page_interleave(gfp, order, nid);
-                if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+                if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
                         goto retry_cpuset;
 
                 return page;
@@ -2081,7 +2081,7 @@ retry_cpuset:
                                       policy_nodemask(gfp, pol));
         if (unlikely(mpol_needs_cond_ref(pol)))
                 __mpol_put(pol);
-        if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+        if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
                 goto retry_cpuset;
         return page;
 }
@@ -2115,7 +2115,7 @@ struct page *alloc_pages_current(gfp_t gfp, unsigned order)
                 pol = &default_policy;
 
 retry_cpuset:
-        cpuset_mems_cookie = get_mems_allowed();
+        cpuset_mems_cookie = read_mems_allowed_begin();
 
         /*
          * No reference counting needed for current->mempolicy
@@ -2128,7 +2128,7 @@ retry_cpuset:
                                 policy_zonelist(gfp, pol, numa_node_id()),
                                 policy_nodemask(gfp, pol));
 
-        if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+        if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
                 goto retry_cpuset;
 
         return page;
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 3bac76ae4b30..979378deccbf 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2739,7 +2739,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
                 return NULL;
 
 retry_cpuset:
-        cpuset_mems_cookie = get_mems_allowed();
+        cpuset_mems_cookie = read_mems_allowed_begin();
 
         /* The preferred zone is used for statistics later */
         first_zones_zonelist(zonelist, high_zoneidx,
@@ -2777,7 +2777,7 @@ out:
          * the mask is being updated. If a page allocation is about to fail,
          * check if the cpuset changed during allocation and if so, retry.
          */
-        if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
+        if (unlikely(!page && read_mems_allowed_retry(cpuset_mems_cookie)))
                 goto retry_cpuset;
 
         memcg_kmem_commit_charge(page, memcg, order);
@@ -3045,9 +3045,9 @@ bool skip_free_areas_node(unsigned int flags, int nid)
                 goto out;
 
         do {
-                cpuset_mems_cookie = get_mems_allowed();
+                cpuset_mems_cookie = read_mems_allowed_begin();
                 ret = !node_isset(nid, cpuset_current_mems_allowed);
-        } while (!put_mems_allowed(cpuset_mems_cookie));
+        } while (read_mems_allowed_retry(cpuset_mems_cookie));
 out:
         return ret;
 }
diff --git a/mm/slab.c b/mm/slab.c
index b264214c77ea..9153c802e2fe 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3073,7 +3073,7 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
         local_flags = flags & (GFP_CONSTRAINT_MASK|GFP_RECLAIM_MASK);
 
 retry_cpuset:
-        cpuset_mems_cookie = get_mems_allowed();
+        cpuset_mems_cookie = read_mems_allowed_begin();
         zonelist = node_zonelist(slab_node(), flags);
 
 retry:
@@ -3131,7 +3131,7 @@ retry:
                 }
         }
 
-        if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !obj))
+        if (unlikely(!obj && read_mems_allowed_retry(cpuset_mems_cookie)))
                 goto retry_cpuset;
         return obj;
 }
diff --git a/mm/slub.c b/mm/slub.c
index 25f14ad8f817..7611f148ee81 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1684,7 +1684,7 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
                 return NULL;
 
         do {
-                cpuset_mems_cookie = get_mems_allowed();
+                cpuset_mems_cookie = read_mems_allowed_begin();
                 zonelist = node_zonelist(slab_node(), flags);
                 for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
                         struct kmem_cache_node *n;
@@ -1696,19 +1696,17 @@ static void *get_any_partial(struct kmem_cache *s, gfp_t flags,
                                 object = get_partial_node(s, n, c, flags);
                                 if (object) {
                                         /*
-                                         * Return the object even if
-                                         * put_mems_allowed indicated that
-                                         * the cpuset mems_allowed was
-                                         * updated in parallel. It's a
-                                         * harmless race between the alloc
-                                         * and the cpuset update.
+                                         * Don't check read_mems_allowed_retry()
+                                         * here - if mems_allowed was updated in
+                                         * parallel, that was a harmless race
+                                         * between allocation and the cpuset
+                                         * update
                                          */
-                                        put_mems_allowed(cpuset_mems_cookie);
                                         return object;
                                 }
                         }
                 }
-        } while (!put_mems_allowed(cpuset_mems_cookie));
+        } while (read_mems_allowed_retry(cpuset_mems_cookie));
 #endif
         return NULL;
 }