Merge tag 'ecryptfs-3.8-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git...

[karo-tx-linux.git] / mm / page_alloc.c

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d037c8bc15123cabf0d1c0c0043e028e59a64686..4ba5e37127fca863af15fe3090f068ac295c0386 100644 (file)
--- 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) {
@@ -5944,8 +5978,15 @@ done:
 
 void free_contig_range(unsigned long pfn, unsigned nr_pages)
 {
-       for (; nr_pages--; ++pfn)
-               __free_page(pfn_to_page(pfn));
+       unsigned int count = 0;
+
+       for (; nr_pages--; pfn++) {
+               struct page *page = pfn_to_page(pfn);
+
+               count += page_count(page) != 1;
+               __free_page(page);
+       }
+       WARN(count != 0, "%d pages are still in use!\n", count);
 }
 #endif