mm: vmscan: invoke slab shrinkers from shrink_zone()

[deliverable/linux.git] / include / linux / mm.h

diff --git a/include/linux/mm.h b/include/linux/mm.h
index b46461116cd2c49333ee26767a4ff5af01dd8ffa..c0a67b894c4ce5338e845774b3c4e3ad8c325f5f 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -19,6 +19,7 @@
 #include <linux/bit_spinlock.h>
 #include <linux/shrinker.h>
 #include <linux/resource.h>
+#include <linux/page_ext.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -56,6 +57,17 @@ extern int sysctl_legacy_va_layout;
 #define __pa_symbol(x)  __pa(RELOC_HIDE((unsigned long)(x), 0))
 #endif
 
+/*
+ * To prevent common memory management code establishing
+ * a zero page mapping on a read fault.
+ * This macro should be defined within <asm/pgtable.h>.
+ * s390 does this to prevent multiplexing of hardware bits
+ * related to the physical page in case of virtualization.
+ */
+#ifndef mm_forbids_zeropage
+#define mm_forbids_zeropage(X) (0)
+#endif
+
 extern unsigned long sysctl_user_reserve_kbytes;
 extern unsigned long sysctl_admin_reserve_kbytes;
 
@@ -128,6 +140,7 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_HUGETLB     0x00400000      /* Huge TLB Page VM */
 #define VM_NONLINEAR   0x00800000      /* Is non-linear (remap_file_pages) */
 #define VM_ARCH_1      0x01000000      /* Architecture-specific flag */
+#define VM_ARCH_2      0x02000000
 #define VM_DONTDUMP    0x04000000      /* Do not include in the core dump */
 
 #ifdef CONFIG_MEM_SOFT_DIRTY
@@ -155,6 +168,11 @@ extern unsigned int kobjsize(const void *objp);
 # define VM_MAPPED_COPY        VM_ARCH_1       /* T if mapped copy of data (nommu mmap) */
 #endif
 
+#if defined(CONFIG_X86)
+/* MPX specific bounds table or bounds directory */
+# define VM_MPX                VM_ARCH_2
+#endif
+
 #ifndef VM_GROWSUP
 # define VM_GROWSUP    VM_NONE
 #endif
@@ -2043,7 +2061,22 @@ static inline void vm_stat_account(struct mm_struct *mm,
 #endif /* CONFIG_PROC_FS */
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
-extern void kernel_map_pages(struct page *page, int numpages, int enable);
+extern bool _debug_pagealloc_enabled;
+extern void __kernel_map_pages(struct page *page, int numpages, int enable);
+
+static inline bool debug_pagealloc_enabled(void)
+{
+       return _debug_pagealloc_enabled;
+}
+
+static inline void
+kernel_map_pages(struct page *page, int numpages, int enable)
+{
+       if (!debug_pagealloc_enabled())
+               return;
+
+       __kernel_map_pages(page, numpages, enable);
+}
 #ifdef CONFIG_HIBERNATION
 extern bool kernel_page_present(struct page *page);
 #endif /* CONFIG_HIBERNATION */
@@ -2077,9 +2110,9 @@ int drop_caches_sysctl_handler(struct ctl_table *, int,
                                        void __user *, size_t *, loff_t *);
 #endif
 
-unsigned long shrink_slab(struct shrink_control *shrink,
-                         unsigned long nr_pages_scanned,
-                         unsigned long lru_pages);
+unsigned long shrink_node_slabs(gfp_t gfp_mask, int nid,
+                               unsigned long nr_scanned,
+                               unsigned long nr_eligible);
 
 #ifndef CONFIG_MMU
 #define randomize_va_space 0
@@ -2138,20 +2171,36 @@ extern void copy_user_huge_page(struct page *dst, struct page *src,
                                unsigned int pages_per_huge_page);
 #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */
 
+extern struct page_ext_operations debug_guardpage_ops;
+extern struct page_ext_operations page_poisoning_ops;
+
 #ifdef CONFIG_DEBUG_PAGEALLOC
 extern unsigned int _debug_guardpage_minorder;
+extern bool _debug_guardpage_enabled;
 
 static inline unsigned int debug_guardpage_minorder(void)
 {
        return _debug_guardpage_minorder;
 }
 
+static inline bool debug_guardpage_enabled(void)
+{
+       return _debug_guardpage_enabled;
+}
+
 static inline bool page_is_guard(struct page *page)
 {
-       return test_bit(PAGE_DEBUG_FLAG_GUARD, &page->debug_flags);
+       struct page_ext *page_ext;
+
+       if (!debug_guardpage_enabled())
+               return false;
+
+       page_ext = lookup_page_ext(page);
+       return test_bit(PAGE_EXT_DEBUG_GUARD, &page_ext->flags);
 }
 #else
 static inline unsigned int debug_guardpage_minorder(void) { return 0; }
+static inline bool debug_guardpage_enabled(void) { return false; }
 static inline bool page_is_guard(struct page *page) { return false; }
 #endif /* CONFIG_DEBUG_PAGEALLOC */