ZS_OBJS_ALLOCATED
class_stat_add(class, ZS_OBJS_ALLOCATED, class->objs_per_zspage);
unsigned long obj_allocated = class_stat_read(class, ZS_OBJS_ALLOCATED);
obj_allocated = class_stat_read(class, ZS_OBJS_ALLOCATED);
class_stat_sub(class, ZS_OBJS_ALLOCATED, class->objs_per_zspage);