IHK query free memory request and implementation

lib/include/ihk/cpu.h

@@ -26,6 +26,7 @@ int ihk_mc_unregister_interrupt_handler(int vector,
 
 enum ihk_mc_gv_type {
 	IHK_GV_IKC = 1,
+	IHK_GV_QUERY_FREE_MEM = 2
 };
 
 int ihk_mc_get_vector(enum ihk_mc_gv_type type);

lib/include/ihk/page_alloc.h

@@ -24,5 +24,6 @@ unsigned long ihk_pagealloc_alloc(void *__desc, int npages);
 void ihk_pagealloc_reserve(void *desc, unsigned long start, unsigned long end);
 void ihk_pagealloc_free(void *__desc, unsigned long address, int npages);
 unsigned long ihk_pagealloc_count(void *__desc);
+int ihk_pagealloc_query_free(void *__desc);
 
 #endif