Merge branch 'akpm' (more patches from Andrew)

Merge patches from Andrew Morton:
 "Most of the rest of MM, plus a few dribs and drabs.

  I still have quite a few irritating patches left around: ones with
  dubious testing results, lack of review, ones which should have gone
  via maintainer trees but the maintainers are slack, etc.

  I need to be more activist in getting these things wrapped up outside
  the merge window, but they're such a PITA."

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (48 commits)
  mm/vmscan.c: avoid possible deadlock caused by too_many_isolated()
  vmscan: comment too_many_isolated()
  mm/kmemleak.c: remove obsolete simple_strtoul
  mm/memory_hotplug.c: improve comments
  mm/hugetlb: create hugetlb cgroup file in hugetlb_init
  mm/mprotect.c: coding-style cleanups
  Documentation: ABI: /sys/devices/system/node/
  slub: drop mutex before deleting sysfs entry
  memcg: add comments clarifying aspects of cache attribute propagation
  kmem: add slab-specific documentation about the kmem controller
  slub: slub-specific propagation changes
  slab: propagate tunable values
  memcg: aggregate memcg cache values in slabinfo
  memcg/sl[au]b: shrink dead caches
  memcg/sl[au]b: track all the memcg children of a kmem_cache
  memcg: destroy memcg caches
  sl[au]b: allocate objects from memcg cache
  sl[au]b: always get the cache from its page in kmem_cache_free()
  memcg: skip memcg kmem allocations in specified code regions
  memcg: infrastructure to match an allocation to the right cache
  ...

1 files changed, 36 insertions, 2 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d037c8bc1512..2ad2ad168efe 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -371,8 +371,7 @@ static int destroy_compound_page(struct page *page, unsigned long order)
         int nr_pages = 1 << order;
         int bad = 0;
 
-        if (unlikely(compound_order(page) != order) ||
-            unlikely(!PageHead(page))) {
+        if (unlikely(compound_order(page) != order)) {
                 bad_page(page);
                 bad++;
         }
@@ -2613,6 +2612,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
         int migratetype = allocflags_to_migratetype(gfp_mask);
         unsigned int cpuset_mems_cookie;
         int alloc_flags = ALLOC_WMARK_LOW|ALLOC_CPUSET;
+        struct mem_cgroup *memcg = NULL;
 
         gfp_mask &= gfp_allowed_mask;
 
@@ -2631,6 +2631,13 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
         if (unlikely(!zonelist->_zonerefs->zone))
                 return NULL;
 
+        /*
+         * Will only have any effect when __GFP_KMEMCG is set.  This is
+         * verified in the (always inline) callee
+         */
+        if (!memcg_kmem_newpage_charge(gfp_mask, &memcg, order))
+                return NULL;
+
 retry_cpuset:
         cpuset_mems_cookie = get_mems_allowed();
 
@@ -2666,6 +2673,8 @@ out:
         if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page))
                 goto retry_cpuset;
 
+        memcg_kmem_commit_charge(page, memcg, order);
+
         return page;
 }
 EXPORT_SYMBOL(__alloc_pages_nodemask);
@@ -2718,6 +2727,31 @@ void free_pages(unsigned long addr, unsigned int order)
 
 EXPORT_SYMBOL(free_pages);
 
+/*
+ * __free_memcg_kmem_pages and free_memcg_kmem_pages will free
+ * pages allocated with __GFP_KMEMCG.
+ *
+ * Those pages are accounted to a particular memcg, embedded in the
+ * corresponding page_cgroup. To avoid adding a hit in the allocator to search
+ * for that information only to find out that it is NULL for users who have no
+ * interest in that whatsoever, we provide these functions.
+ *
+ * The caller knows better which flags it relies on.
+ */
+void __free_memcg_kmem_pages(struct page *page, unsigned int order)
+{
+        memcg_kmem_uncharge_pages(page, order);
+        __free_pages(page, order);
+}
+
+void free_memcg_kmem_pages(unsigned long addr, unsigned int order)
+{
+        if (addr != 0) {
+                VM_BUG_ON(!virt_addr_valid((void *)addr));
+                __free_memcg_kmem_pages(virt_to_page((void *)addr), order);
+        }
+}
+
 static void *make_alloc_exact(unsigned long addr, unsigned order, size_t size)
 {
         if (addr) {