+#if BITS_PER_LONG == 32
+/* limit to lowmem on 32-bit systems */
+# define NUM_CACHEPAGES \
+ min(cfs_totalram_pages(), 1UL << (30 - PAGE_SHIFT) * 3 / 4)
+#else
+# define NUM_CACHEPAGES cfs_totalram_pages()
+#endif
+
+static inline unsigned int memory_pressure_get(void)
+{
+ return current->flags & PF_MEMALLOC;
+}
+
+static inline void memory_pressure_set(void)
+{
+ current->flags |= PF_MEMALLOC;
+}
+
+static inline void memory_pressure_clr(void)
+{
+ current->flags &= ~PF_MEMALLOC;
+}
+